Engine Controls/fuel - 3.6l - Repair Instructions Buick Enclave I

Crankshaft Position System Variation Learn

Note. The Crankshaft Position System Variation Learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: An engine replacement A engine control module (ECM) replacement A crankshaft balancer replacement A crankshaft replacement A crankshaft position sensor replacement Any engine repairs which disturb the crankshaft to crankshaft position sensor relationship.

Note. The ECM monitors certain component signals to determine if all the conditions are met to continue with the crankshaft position System Variation Learn Procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool displays the signals of the following components: Crankshaft position sensors activity-If there is a crankshaft position sensor condition, refer to the applicable DTC that set. Camshaft position sensor signal activity-If there is a camshaft position sensor signal condition, refer to the applicable DTC that set. Engine coolant temperature (ECT)-If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.

1. Install a scan tool.
2. Monitor the ECM for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) for the applicable DTC that set.
3. With a scan tool, select the Crankshaft Position System Variation Learn Procedure and perform the following: Block drive wheels. Set parking brake. DO NOT apply brake pedal. Cycle ignition from OFF to ON. Apply and hold brake pedal for the duration of the procedure. Start and idle engine. Turn the air conditioning (A/C) OFF. The vehicle must remain in Park or Neutral. NOTE: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. Accelerate to wide open throttle (WOT) and release when the fuel cut-off occurs.
4. The scan tool displays Learn Status: Learned this Ignition. If the scan tool indicates that DTC P0315 ran and passed, the crankshaft position variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, or another DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.
5. Once the learn procedure has successfully completed, and in order to store the crankshaft position system variation values in the ECM, turn OFF the ignition and verify all vehicle systems are OFF. This may take up to 2 minutes.

Engine Control Module Replacement

Note. Before removing the engine control module (ECM), use the scan tool to capture the ECM data. This captured data will then need to be restored into the NEW ECM. Refer to Control Module References .

Removal Procedure

1. Turn the ignition OFF.
2. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
3. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/enclave/i-2007-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
4. Disconnect the engine wiring harness middle and lower electrical connectors (1) from the ECM .
5. If also replacing the ECM bracket, remove the engine wiring harness clip (2) from the ECM bracket tab.
6. Disconnect the engine wiring harness upper electrical connector (1) from the ECM.
7. Gently lift up the retaining tab (1) and lift the ECM up and out of the support brackets on the ECM bracket.
8. If necessary, remove the ECM bracket bolts (1) and bracket.

Installation Procedure

1. If necessary, position the ECM bracket and install the bolts (1). Tighten Tighten the bolts to 6 N.m (53 lb in).
2. Install the ECM onto the ECM bracket support tabs and snap the ECM into place under the retaining tab (1).
3. Connect the engine wiring harness upper electrical connector (1) to the ECM.
4. If the ECM bracket was also replaced, install the engine wiring harness clip (2) to the ECM bracket tab.
5. Connect the engine wiring harness middle and lower electrical connectors (1) to the ECM.
6. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/enclave/i-2007-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
7. If a NEW ECM was installed, reprogram the ECM. Refer to «Engine Control Module Programming and Setup»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__engine-control-module-programming-and-setup) .

Description

The engine control module (ECM) learns the airflow through the throttle body to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to throttle body coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned.

An engine that had a heavily coked throttle body that has been cleaned or replaced may take several drive cycles to learn out the coking. To accelerate the process, the scan tool has the ability to reset all learned values back to zero. A new ECM will also have values set to zero.

The idle may be unstable or a DTC may set if the learned values do not match the actual airflow.

Conditions for Running the Throttle Learn Procedure

Reset Procedure

1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201-P0206, P0222, P0223, P0300-P0306, P0351-P0356, P0496, P0506, P0507, P0601-P0604, P0606, P062B, P062F, P0630, P0641, P0651, P0697, P06A3, P1101, P1516, P2101, P2119, P2122, P2123, P2127, P2128, P16F3, P2135, P2138, P2176, or P2610 are not set.
2. Ignition ON, engine OFF.
3. The vehicle speed sensor (VSS) is 0 km/h (0 mph).

Learn Procedure

1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201-P0206, P0222, P0223, P0300-P0306, P0351-P0356, P0496, P0506, P0507, P0601-P0604, P0606, P062B, P062F, P0630, P0641, P0651, P0697, P06A3, P1101, P1516, P2101, P2119, P2122, P2123, P2127, P2128, P16F3, P2135, P2138, P2176, or P2610 are not set.
2. The engine speed is between 450-4,000 RPM.
3. The manifold absolute pressure (MAP) is greater than 5 kPa.
4. The mass air flow (MAF) is greater than 2 g/s.
5. The ignition voltage is greater than 11 V.

Reset/Learn Procedure

Reset Procedure - Performed after the throttle body is cleaned or replaced

1. Ignition ON, engine OFF, perform the Idle Learn Reset in Module Setup with a scan tool.
2. Engine idling, monitor the Throttle Body Idle Airflow Compensation parameter. The Throttle Body Idle Airflow Compensation value should equal 0 % and the engine should be idling at a normal idle speed.
3. Clear the DTCs and return to the diagnostic that referred you here.

Learn Procedure - Performed after the ECM is programmed or replaced

1. Engine idling for 3 minutes.
2. Monitor the Desired Idle Speed and the actual Engine Speed with a scan tool.
3. The ECM will start to learn the new idle cells and Desired Idle Speed should start to decrease.
4. Ignition OFF for 60 s.
5. Engine idling for 3 minutes.
6. After the 3 minute run time the engine speed should return to normal. NOTE: During the drive cycle monitor the DTC information with a scan tool to verify DTC P0506 and P0507 do not set. If DTC P0506 and P0507 set, clear the DTCs so the ECM can continue to learn. If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
7. After the drive cycle, the engine speed should return to normal. If the engine idle speed has not been learned, turn OFF the ignition for 60 s and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs and return to the diagnostic that referred you here.

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Slide the electrical connector heat shield up the wiring harness.
3. Disconnect the engine wiring harness electrical connector (8) from the engine coolant temperature (ECT) sensor (9).
4. Remove the ECT sensor.

1. Install the ECT sensor. Tighten Tighten the sensor to 22 N.m (16 lb ft).
2. Connect the engine wiring harness electrical connector (8) to the ECT sensor (9).
3. Slide the electrical connector heat shield down over the connector.
4. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .

1. Disconnect the engine wiring harness electrical connector from the mass air flow (MAF)/intake air temperature (IAT) sensor.
2. Remove the MAF/IAT sensor screws (1).
3. Remove the MAF/IAT sensor (2) from the air cleaner assembly.

1. Install the MAF/IAT sensor (2) to the air cleaner assembly.
2. Install the MAF/IAT sensor screws (1). Tighten Tighten the screws to 4 N.m (35 lb in).
3. Connect the engine wiring harness electrical connector to the MAF/IAT sensor.

Scheme 1

Manifold Absolute Pressure Sensor Replacement

1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Disconnect the engine wiring harness electrical connector (3) from the heated oxygen sensor (HO2S) electrical connector (2).
3. Remove the HO2S electrical connector retainer from the engine wiring harness clip (1).
4. Remove the HO2S (2) from the exhaust manifold.

Note. A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (2) to the exhaust manifold. Tighten Tighten the sensor to 42 N.m (31 lb ft).
3. Connect the engine wiring harness electrical connector (3) to the HO2S electrical connector (2).
4. Install the HO2S electrical connector retainer to the engine wiring harness clip (1).
5. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the connector position assurance (CPA) retainer (4).
3. Disconnect the heated oxygen sensor (HO2S) electrical connector (6) from the engine wiring harness electrical connector (5).
4. Remove the HO2S (3) from the exhaust pipe.

Note. A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (3) to the exhaust pipe. Tighten Tighten the sensor to 42 N.m (31 lb ft).
3. Connect the HO2S electrical connector (6) to the engine wiring harness electrical connector (5).
4. Install the CPA retainer (4).
5. Lower the vehicle.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Disconnect the engine wiring harness electrical connector (2) from the heated oxygen sensor (HO2S) electrical connector (3).
3. Remove the HO2S electrical connector retainer from the engine wiring harness clip (1).
4. Remove the HO2S (1) from the exhaust manifold.

Note. A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (1) to the exhaust manifold. Tighten Tighten the sensor to 42 N.m (31 lb ft).
3. Connect the engine wiring harness electrical connector (2) to the HO2S electrical connector (3).
4. Install the HO2S electrical connector retainer to the engine wiring harness clip (1).
5. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the connector position assurance (CPA) retainer (3).
3. Disconnect the heated oxygen sensor (HO2S) electrical connector (4) from the engine wiring harness electrical connector (1).
4. Remove the HO2S (4) from the exhaust pipe.

Note. A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (4) to the exhaust pipe. Tighten Tighten the sensor to 42 N.m (31 lb ft).
3. Connect the HO2S electrical connector (4) to the engine wiring harness electrical connector (1).
4. Install the CPA retainer (3).
5. Lower the vehicle.

1. Remove the left instrument panel (I/P) insulator. Refer to «Instrument Panel Insulator Panel Replacement - Left Side (Enclave)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , «Instrument Panel Insulator Panel Replacement - Left Side (Acadia)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , «Instrument Panel Insulator Panel Replacement - Left Side (Traverse)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
2. Remove the driver knee bolster. Refer to «Driver Knee Bolster Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , «Driver Knee Bolster Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , «Driver Knee Bolster Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
3. Remove the I/P wiring harness electrical connector (2) from the accelerator pedal position (APP) sensor assembly.
4. Remove the APP sensor bolts and sensor assembly from the vehicle.

1. Install the upper bolt into the APP sensor assembly.
2. Install the APP sensor assembly into the vehicle.
3. Install the remaining 2 lower APP sensor assembly bolts. Tighten Tighten the bolts to 8 N.m (71 lb in).
4. Install the I/P wiring harness electrical connector (2) to the APP sensor assembly.
5. Install the driver knee bolster. Refer to «Driver Knee Bolster Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , «Driver Knee Bolster Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , «Driver Knee Bolster Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
6. Install the left I/P insulator. Refer to «Instrument Panel Insulator Panel Replacement - Left Side (Enclave)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , «Instrument Panel Insulator Panel Replacement - Left Side (Acadia)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , «Instrument Panel Insulator Panel Replacement - Left Side (Traverse)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
2. Disconnect the engine wiring harness electrical connector (2) from the electronic throttle control (1).
3. Remove the throttle body bolts (3).
4. Remove the throttle body (2) and gasket (2). Discard the gasket.

1. Position a NEW throttle body gasket (1) and throttle body (2) to the upper intake manifold.
2. Install the throttle body bolts (3). Tighten Tighten the bolts to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector (2) to the electronic throttle control (1).
4. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Perform the throttle learn procedure. Refer to «Throttle/Idle Learn»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

Throttle Body Inspection and Cleaning

Note. Over extended time and mileage, deposits may accumulate on the back of the throttle valve plate. The source of the deposit is exhaust gas recirculation (EGR) gas. Typically these deposits pose no problem. Occasionally the deposit may accumulate to a point where perceived pedal effort or throttle valve movement is effected. This procedure should not be performed on vehicles with mileage under 80 450 km (50,000 mi).

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
2. Inspect the throttle body bore and the throttle valve plate for deposits. You will need to open the throttle valve in order to inspect all surfaces.
3. Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-specifications__adhesives-fluids-lubricants-and-sealers) .
4. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Perform the Throttle/Idle Learn procedure. Refer to «Throttle/Idle Learn»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

Fuel Pressure Relief (Without CH-48027)

1. If the fuel system requires repair, prevent fuel spillage by removing the fuel pump fuse. Refer to «Electrical Center Identification Views»(/buick/enclave/i-2007-2013/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views) .
2. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
3. Remove the engine cover, if required.
4. Remove the fuel rail service port cap.
5. Wrap a shop towel around the fuel rail service port and using a small flat-bladed tool, depress (open) the fuel rail test port valve.
6. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
7. Install the fuel rail service port cap.
8. Install the engine cover, if required.
9. Tighten the fuel fill cap.

Fuel Pressure Relief (CH-48027)

Special Tools

CH-48027 Digital Pressure Gauge

1. If the fuel system requires repair, prevent fuel spillage by removing the fuel pump fuse. Refer to «Electrical Center Identification Views»(/buick/enclave/i-2007-2013/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views) .
2. Remove the engine cover, if required.
3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
4. Remove the fuel rail service port cap.
5. Wrap a shop towel around the fuel rail service port.
6. Connect the CH-48027-3 (4) to the fuel rail service port.
7. Connect the CH-48027-2 (2) to the CH-48027-3 (4).
8. Place the hose on the CH-48027-2 (2) into an approved gasoline container.
9. Open the valve on the CH-48027-2 (2) in order to bleed any fuel from the fuel rail.
10. Close the valve on the CH-48027-2 (2).
11. Remove the hose on the CH-48027-2 (2) from the approved gasoline container.
12. Disconnect the CH-48027-2 (2) from the CH-48027-3 (4).
13. Disconnect the CH-48027-3 (4) from the fuel rail service port.
14. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
15. Install the fuel rail service port cap.
16. Install the engine cover, if required.
17. Tighten the fuel fill cap.

Fuel Pressure Relief (High Side)

1. Remove the fuel pump module 20A fuse from the underhood electrical center.
2. Start the vehicle and allow the engine to idle until the engine stops. The engine will stop in approximately 20-30 seconds.
3. Turn the ignition OFF.

Fuel Pressure Gauge Installation and Removal

Special Tools

CH-48027 Digital Pressure Gauge

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Connect the CH-48027-1 (1) to the CH-48027-2 (2).
3. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
4. Perform any tests and/or diagnostics as needed. For the proper usage of the CH-48027 digital pressure gauge , refer to the manufacture's directions.

1. Relieve the fuel system pressure, if required. Perform the following steps: WARNING: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gauge. Place the towel in an approved container when the connection of the fuel pressure gauge is complete. Wrap a shop towel around the fuel rail service port. Place the hose on the CH-48027-2 (2) into an approved gasoline container. Open the valve on the CH-48027-2 (2) in order to bleed any fuel from the fuel rail. Close the valve on the CH-48027-2 (2). Remove the hose on the CH-48027-2 (2) from the approved gasoline container. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
2. Disconnect the CH-48027-1 (1) from the CH-48027-2 (2).
3. Disconnect the CH-48027-2 (2) from the CH-48027-3 (4).
4. Disconnect the CH-48027-3 (4) from the fuel rail service port.
5. Install the fuel rail service port cap.
6. Tighten the fuel fill cap.

Metal Collar Quick Connect Fitting Service

Special Tools

J 37088-A Fuel Line Disconnect Tool Set

1. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Remove the fuel feed line quick connect fitting retainer.
3. Blow dirt out of the fitting using compressed air.
4. Choose the correct tool from the J 37088-A Tool Set for the size of the fitting. Insert the tool into the female connector, then push inward in order to release the locking tabs.
5. Pull the connection apart.
6. Use a clean shop towel in order to wipe off the male pipe end.
7. Inspect both ends of the fitting for dirt and burrs. Clean or replace the components as required.

1. Apply a few drops of clean engine oil to the male pipe end.
2. Push both sides of the fitting together in order to snap the retaining tabs into place.
3. Once installed, pull on both sides of the fitting in order to make sure the connection is secure.
4. Install the retainer to the quick-connect fitting.

Scheme 2

Note. There are several types of plastic collar fuel and evaporative emission quick connect fittings used on this vehicle. Bartholomew (1) Q Release (2) Squeeze to Release (3) Sliding Retainer (4)

1. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Using compressed air, blow any dirt out of the quick-connect fitting.
3. This step applies to Bartholomew style connectors ONLY. Squeeze the plastic quick connect fitting release tabs.
4. This step applies to Q Release style connectors ONLY. Release the fitting by pushing the tab toward the other side of the slot in the fitting.
5. This step applies to Squeeze to Release style connectors ONLY. Squeeze where indicated by arrows on both sides of the plastic ring surrounding the quick connect fitting.
6. This step applies to Sliding Retainer style connectors ONLY. Release the fitting by pressing on one side of the release tab causing it to push in slightly. If the tab doesn't move try pressing the tab in from the opposite side. The tab will only move in one direction.
7. Pull the connection apart.

1. Apply a few drops of clean engine oil to the male connection end.
2. Push both sides of the quick-connect fitting together in order to cause the retaining feature to snap into place.
3. Once installed, pull on both sides of the quick-connect fitting in order to make sure the connection is secure.

Fuel Tank Draining

Special Tools

J 45004 Fuel Tank Drain Hose

1. Remove the fuel fill cap.
2. Insert the J 45004 fuel tank drain hose into the fuel tank through the fuel tank fill pipe until the hose reaches the bottom of the fuel tank.
3. Use a hand or air operated pump device in order to drain as much fuel from the fuel tank as possible.
4. Remove the J 45004 fuel tank drain hose from the fuel tank fill pipe.
5. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
6. Loosen the fuel tank fill hose clamp (1) at the fuel tank.
7. Disconnect the evaporative emission (EVAP) canister vent rear pipe quick connect fitting (4) from the recirculation line on the fuel fill pipe (3). Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
8. Separate the fuel tank fill hose from the fuel tank.
9. Insert the J 45004 fuel tank drain hose into the fuel tank through the fuel tank opening.
10. Use the hand or air operated pump device again, drain as much fuel from the fuel tank as possible.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Drain the fuel tank. Refer to «Fuel Tank Draining»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-tank-draining) .
3. Disconnect the fuel pump fuel feed line quick connect fitting (6) from the chassis fuel line. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
4. Disconnect the fuel tank evaporative emission (EVAP) canister vent front pipe quick connect fitting (5) from the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Disconnect the vent hose from the left rear of the fuel tank.
6. Disconnect the fuel sender wiring harness electrical connector (2) from the body wiring harness electrical connector.
7. Remove the fuel sender wiring harness clip (1) from the underbody side rail extension.
8. Remove the left underbody side rail. Refer to «Underbody Rear Side Rail Replacement»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
9. Support the fuel tank with a suitable adjustable jack.
10. Remove the fuel tank strap bolts (1). Allow the fuel tank straps to hang.
11. Push up on the rear of the strap slightly and rotate the strap towards the rear of the vehicle, in order the remove the fuel tank straps (1).
12. Using the adjustable jack and the aid of an assistant, lower the fuel tank from the underbody of the vehicle.
13. With the aid of the assistant, remove the fuel tank from the adjustable jack, and place on a flat work surface.
14. If replacing the fuel tank, perform the following steps, otherwise proceed to step 21 in the installation procedure.
15. Remove the fuel tank front and rear shield push on nuts (2).
16. Remove the fuel tank front and rear shield nuts (3).
17. Remove the fuel tank front (1) and rear (4) shields.
18. Remove the foam pad insulators (1) from the top of the fuel tank.
19. Disconnect the fuel pump fuel feed line quick connect fitting (1) from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
20. Remove the fuel pump fuel feed line from the retaining features (2) built into the fuel tank and out from under the EVAP canister vent rear pipe.
21. Disconnect the EVAP canister vent front pipe quick connect fitting (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
22. Remove the EVAP canister vent front pipe from the retaining features (2) built into the fuel tank.
23. Disconnect the fuel sender wiring harness electrical connectors from the fuel tank module (1), fuel tank pressure sensor 2), and EVAP canister vent solenoid (3).
24. Remove the fuel sender wiring harness.
25. Disconnect the EVAP canister vent rear pipe quick connect fitting (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
26. Squeeze the retainer (2) into order to disengage the retainer from the EVAP canister, and remove the EVAP canister assembly from the EVAP canister bracket retainers (1).
27. Disconnect the EVAP canister vent rear pipe quick connect fittings (1) from the fuel tank rollover valves. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
28. Disconnect the EVAP canister vent rear pipe quick connect fitting (2) from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
29. Remove the EVAP canister vent rear pipe from the retaining features (3) built into the fuel tank.
30. Remove the fuel tank module. Refer to «Fuel Tank Module Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-tank-module-replacement) .

1. If the fuel tank was replaced, perform the following steps, otherwise proceed the step 21.
2. Install the fuel tank module. Refer to «Fuel Tank Module Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-tank-module-replacement) .
3. Lay the EVAP canister vent rear pipe into position on the fuel tank.
4. Connect the EVAP canister vent rear pipe quick connect fittings (1) to the fuel tank rollover valves. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Connect the EVAP canister vent rear pipe quick connect fitting (2) to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
6. Install the EVAP canister vent rear pipe to the retaining features (3) built into the fuel tank.
7. Insert the rear of the EVAP canister into the EVAP canister bracket retainers (1), squeeze the retainer (2), and set the EVAP canister assembly into place.
8. Connect the EVAP canister vent rear pipe quick connect fitting (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Place the fuel sender wiring harness into the channel in the fuel tank.
10. Connect the fuel sender wiring harness electrical connectors to the fuel tank module (1), fuel tank pressure sensor (2), and EVAP canister vent solenoid (3).
11. Lay the EVAP canister vent front pipe into position on the fuel tank.
12. Connect the EVAP canister vent rear pipe quick connect fitting (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
13. Install the EVAP canister vent rear pipe to the retaining features (2) built into the fuel tank.
14. Route the fuel pump fuel feed pipe under the EVAP canister vent rear pipe and lay into position on the fuel tank.
15. Connect the fuel pump fuel feed line quick connect fitting (1) to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
16. Install the fuel pump fuel feed line to the retaining features (2) built into the fuel tank.
17. Install the foam pad insulators (1) onto the top of the fuel tank.
18. Install the fuel tank rear (4) and front (1) shields onto the fuel tank.
19. Install the fuel tank front and rear shield push on nuts (2).
20. Install the fuel tank front and rear shield nuts (3) until snug.
21. With the aid of an assistant, remove the fuel tank from the work surface and place on the adjustable jack.
22. With the aid of the assistant, raise the fuel tank into position under the vehicle.
23. Install the fuel tank straps (1).
24. Install the fuel tank strap bolts (1). Tighten Tighten the bolts to 47 N.m (35 lb ft).
25. Remove the adjustable jack from under the fuel tank.
26. Install the left underbody side rail. Refer to «Underbody Rear Side Rail Replacement»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
27. Connect the fuel sender wiring harness electrical connector (2) to the body wiring harness electrical connector.
28. Install the fuel sender wiring harness clip (1) to the underbody side rail extension.
29. Connect the vent hose to the left rear of the fuel tank.
30. Connect the fuel tank EVAP canister vent front pipe quick connect fitting (5) to the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
31. Connect the fuel pump fuel feed line quick connect fitting (6) to the chassis fuel line. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
32. Position and install the fuel tank fill pipe (2) to the fuel tank.
33. Connect the EVAP canister vent rear pipe quick connect fitting (4) to the recirculation line on the fuel fill pipe (3). Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
34. Tighten the fuel tank fill hose clamp (1) at the fuel tank. Tighten Tighten the clamp to 3.3 N.m (29 lb in).
35. Lower the vehicle.
36. Refill the fuel tank.
37. Tighten the fuel fill cap.
38. Use the following procedure in order the inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
39. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

Scheme 3

Fuel Pump Flow Control Module Replacement

Scheme 4

Fuel Tank Pressure Sensor Replacement

1. Remove the fuel fill cap.
2. Remove the fuel tank fill pipe housing to fuel tank fill pipe bolts (1).
3. Drain the fuel tank. Refer to «Fuel Tank Draining»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-tank-draining) .
4. Remove the left rear wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/buick/enclave/i-2007-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
5. Remove the left rear wheelhouse liner panel. Refer to «Rear Wheelhouse Panel Liner Replacement»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
6. Remove the fuel tank fill pipe bracket bolt (2).
7. Remove the fuel tank fill pipe assembly (3) from the vehicle.
8. Loosen the fuel tank fill hose clamp (2), if necessary.
9. Remove the fuel tank fill hose (1), if necessary.

1. Install the fuel tank fill hose (1), if necessary.
2. Tighten the fuel tank fill hose clamp (2), if necessary. Tighten Tighten the clamp to 3.3 N.m (29 lb in).
3. Position and install the fuel tank fill hose (2) to the fuel tank.
4. Connect the evaporative emission (EVAP) canister vent rear pipe quick connect fitting (4) to the recirculation line on the fuel tank fill pipe (3). Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Tighten the fuel tank fill hose clamp (1) at the fuel tank. Tighten Tighten the clamp to 3.3 N.m (29 lb in).
6. Install the fuel tank fill pipe bracket bolt (2). Tighten Tighten the bolt to 12 N.m (106 lb in).
7. Install the left rear wheelhouse liner panel. Refer to «Rear Wheelhouse Panel Liner Replacement»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
8. Install the left rear wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/buick/enclave/i-2007-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
9. Lower the vehicle.
10. Install the fuel tank fill pipe housing to fuel tank fill pipe bolts (1). Tighten Tighten the bolts to 2 N.m (18 lb in).
11. Install the fuel fill cap.

Fuel Tank Module Replacement

Special Tools

J 45722 Fuel Sender Lock Ring Wrench

Note. A NEW fuel tank module seal is necessary each time the fuel tank module is serviced. Obtain a NEW seal prior to beginning this service procedure.

1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
2. Disconnect the fuel pump fuel feed line quick connect fitting (1) from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Disconnect evaporative emission (EVAP) canister vent front pipe quick connect fitting (4) from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
4. Reposition the fuel pump fuel feed line and the EVAP canister vent front pipe out of the way.
5. Disconnect the fuel sender wiring harness electrical connector (2) from the fuel tank pressure sensor.
6. Disconnect the fuel sender wiring harness electrical connector (3) from the fuel tank module.
7. Install the J 45722 fuel sender lock ring wrench (1) to the fuel tank module lock ring.
8. Using the J 45722 fuel sender lock ring wrench and a long breaker-bar, rotate the lock ring counterclockwise unlocking the fuel tank module lock ring.
9. Remove the J 45722 fuel sender lock ring wrench.
10. Remove the fuel tank module lock ring (1).
11. Slowly raise the module (2) until the fuel level sensor float arm is just visible.
12. Tilt the module towards the lower front corner of the fuel tank to allow the level sensor float arm to clear the tank opening. Remove the module from the fuel tank.
13. Carefully discard the fuel in the module reservoir bucket into an approved container.
14. Remove and discard the fuel tank module seal (3).
15. Remove the fuel level sensor, if required. Refer to «Fuel Level Sensor Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
16. Place the lock ring on a flat surface. Measure the clearance between to lock ring and the flat surface using a feeler gauge at 7 points.
17. If the warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
18. If the warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. Install the fuel level sensor, if required. Refer to «Fuel Level Sensor Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
2. Install a NEW fuel tank module seal (3) onto the fuel tank.
3. Tilt the module towards the lower front corner of the fuel tank to allow the level sensor float arm to clear the tank opening. Install the module into the fuel tank.
4. Position and install the fuel tank module lock ring (1).
5. Install the J 45722 fuel sender lock ring wrench to the fuel tank module lock ring.
6. Using the J 45722 fuel sender lock ring wrench and a long breaker-bar, rotate the lock ring clockwise locking the fuel tank module lock ring.
7. Remove the J 45722 fuel sender lock ring wrench (1) from the fuel tank module lock ring.
8. Connect the fuel sender wiring harness electrical connector (3) to the fuel tank module.
9. Connect the fuel sender wiring harness electrical connector (2) to the fuel tank pressure sensor.
10. Position the fuel pump fuel feed line and the EVAP canister vent front pipe to the fuel tank.
11. Connect EVAP canister vent front pipe quick connect fitting (4) to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
12. Connect the fuel pump fuel feed line quick connect fitting (1) to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
13. Install the fuel tank. Refer to «Fuel Tank Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

1. Remove the fuel tank module. Refer to «Fuel Tank Module Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-tank-module-replacement) .
2. Push down on the fuel level sensor electrical connector tab (1), disengaging the retainer, and disconnect the electrical connector.
3. Remove the fuel level sensor wiring from under the module clip (2).
4. Push in the fuel level sensor tabs (1) disengaging the sensor clips from the module bucket.
5. Slide the fuel level sensor up out from the module bucket.

1. Position the fuel level sensor to the module bucket and slide the sensor down.
2. Ensure that the fuel level sensor tabs (1) engage the module bucket.
3. Install the fuel level sensor wiring under the module clip (2).
4. Connect the fuel level sensor electrical connector (1) to the module cover.
5. Install the fuel tank module. Refer to «Fuel Tank Module Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-tank-module-replacement) .

Scheme 5

Fuel Pump Fuel Feed Hose Replacement

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
3. Remove air cleaner assembly. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
4. Disconnect the brake pressure modulator valve from the body to provide clearance for the fuel pipes. Refer to «Brake Pressure Modulator Valve Replacement»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system)
5. Disconnect the fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
6. Disconnect the evaporative emission (EVAP) pipe (3) quick connect fitting from the EVAP purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
7. Cap the fuel rail and the EVAP purge solenoid in order to prevent possible fuel and/or EVAP system contamination.
8. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
9. Remove the intermediate steering shaft. Refer to «Intermediate Steering Shaft Replacement»(/buick/enclave/i-2007-2013/remont/steering-column-switches/#steering-wheel-and-steering-column) .
10. Disconnect the fuel pump fuel feed pipe quick connect fitting (6) from the chassis fuel feed pipe. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
11. Disconnect the EVAP canister vent front pipe quick connect fitting (5) from the chassis EVAP pipe. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
12. Remove the fuel feed/EVAP pipe assembly clip (1) from the body.
13. Remove the fuel feed/EVAP pipe assembly clip nut (3) and clip (2) from the stud.
14. Loosen the fuel feed/EVAP pipe clip (4) bolt, and remove the fuel feed/EVAP pipe assembly from the vehicle.
15. Mark the location of the retainers on the new pipes and remove the plastic retainers from the old pipes using a soapy solution.

1. Position the fuel feed and EVAP pipes to the vehicle individually, and install the plastic retainers to the marked locations. Tighten the fuel feed/EVAP pipe clip (4) bolt to 8 N.m (71 lb in).
2. Install the fuel feed/EVAP pipe clip (2) and nut (3) to the stud and tighten to 9 N.m (80 lb in).
3. Install the fuel feed/EVAP pipe clip (1) to the body.
4. Connect the EVAP canister vent front pipe quick connect fitting (5) to the chassis EVAP pipe. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Connect the fuel pump fuel feed pipe quick connect fitting (6) to the chassis fuel feed pipe. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
6. Install the intermediate steering shaft. Refer to «Intermediate Steering Shaft Replacement»(/buick/enclave/i-2007-2013/remont/steering-column-switches/#steering-wheel-and-steering-column) .
7. Remove the caps from the fuel rail and the EVAP purge solenoid.
8. Connect the EVAP pipe (3) quick connect fitting to the EVAP purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Connect the fuel feed pipe (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
10. Tighten the fuel fill cap.
11. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
12. Reconnect the brake pressure modulator valve from the body to provide clearance for the fuel pipes. Refer to «Brake Pressure Modulator Valve Replacement»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system)
13. Install the air cleaner assembly. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
14. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

Scheme 6

Fuel Pressure Sensor Replacement - Fuel Feed Pipe

1. Remove the fuel injection sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Remove the high pressure pump shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Relieve the low side fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
4. Disconnect the fuel feed line quick connect fitting from the fuel feed pipe (2). Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
5. Loosen the fuel feed pipe fitting to the high pressure fuel pump.
6. Remove the fuel feed pipe bolts (4) from the cylinder heads.
7. Remove the fuel feed pipe from the engine and high pressure fuel pump. Discard the pipe.

1. Ensure that the fuel feed pipe and fuel pump fittings are clean and dry prior to assembly.
2. Lubricate the pipes with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.
3. Position the NEW fuel feed pipe (2) to the cylinder head and high pressure fuel pump.
4. Install the fuel feed pipe fitting to the high pressure fuel pump hand tight.
5. Install the fuel feed pipe bolts (4). Tighten the bolts to 50 N.m (37 lb ft). Tighten the fitting to 28 N.m (20 lb ft).
6. Connect the fuel feed line quick connect fitting to the fuel feed pipe (2). Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
7. Inspect for leaks using the following procedure: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.
8. Install the low side fuel pressure service port cap.
9. Install the fuel tank cap.
10. Install the high pressure pump shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
11. Install the fuel injection sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

Fuel System Cleaning

1. Remove the fuel tank module. Refer to «Fuel Tank Module Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-tank-module-replacement) .
2. Inspect the fuel pump module strainer. Replace the pump module assembly if the fuel strainer is contaminated.
3. Flush the fuel tank with hot water.
4. Pour the water out of the fuel sender assembly opening in the fuel tank. Rock the fuel tank in order to be sure that the removal of the water from the fuel tank is complete.
5. Allow the tank to dry completely before reassembly.
6. Disconnect the fuel feed pipe at the engine fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
7. Clean the fuel pipes by applying air pressure in the opposite direction of the fuel flow.
8. Connect the fuel feed pipe to the engine fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
9. Install the fuel tank module. Refer to «Fuel Tank Module Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-tank-module-replacement) .

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Remove the intake manifold. Refer to «Intake Manifold Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle)
3. Remove the foam insulator from the fuel rails.
4. Disconnect the fuel pressure sensor electrical connector.
5. Using a 27 mm socket, remove the fuel pressure sensor (1) from the fuel injection fuel rail (2). Discard the fuel pressure sensor.
6. Allow any fuel to drain from the fuel rail and pressure sensor location.
7. Dry the sealing cone in the fuel rail and the area around the sensor joint with a lint free cloth.
8. Inspect the sealing cone in the fuel rail. The surface should be free of fuel, debris, and burrs.

Note. Applying force to the plastic housing of the sensor will destroy the sensor. To tighten or loosen, only apply force to the attached hexagon.

Note. Ensure that the fuel rail threads have been cleaned of any excess fuel, or the NEW fuel injection fuel rail fuel pressure sensor will NOT seal properly.

1. Lubricate the threads and the sealing cone in the fuel rail with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.
2. Lubricate the threads and sealing cone on the NEW fuel injection fuel rail fuel pressure sensor with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.
3. Install the NEW fuel pressure sensor (1) to the fuel injection fuel rail (2) hand tight.
4. Remove the NEW fuel injection fuel rail fuel pressure sensor, re-lubricate following steps 1 and 2 above.
5. Install the NEW fuel pressure sensor (1) to the fuel injection fuel rail (2) and tighten to 33 N.m (25 lb ft).
6. Connect the fuel pressure sensor electrical connector.
7. Install the foam insulator from the fuel rails.
8. Install the intake manifold. Refer to «Intake Manifold Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle)
9. Inspect for fuel leaks using the following procedure: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Remove the fuel pipe shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Remove the intake manifold. Refer to «Intake Manifold Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
4. Remove the high pressure fuel pipe. Discard the pipe. Refer to «Fuel Feed Intermediate Pipe Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Remove the fuel rail crossover pipe. Refer to «Fuel Injection Fuel Rail Crossover Tube Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) . Discard the pipe.
6. Remove the bank 2 fuel injection rail. Refer to «Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
7. Remove the foam insulator from the fuel rails.
8. Disconnect the fuel pressure sensor electrical connector and cut the wire harness tie straps.
9. Remove the fuel rail bolts (2) from both rails, for clearance purposes.
10. Remove the fuel pressure sensor (1). Refer to «Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
11. Remove the fuel rail from the cylinder head.
12. Remove and discard the direct fuel injector hold down clamps.
13. Once the fuel rail is removed, remove the fuel injectors and rebuild them. Refer to «Fuel Injector Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-injector-replacement-llt) .

1. Install the rebuilt direct fuel injectors (1) to the cylinder heads. Refer to «Fuel Injector Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-injector-replacement-llt) .
2. Install NEW direct injector hold down clamps to the injector.
3. On a new fuel rail, lubricate the fuel injector cups with silicon free engine oil GM P/N 12345610 (Canadian P/N 9931930) or equivalent.
4. Carefully place the fuel rail (1) into position, placing the front into the fuel rail over the front injector and rotating the rear downward.
5. Install the 2 outer fuel rail bolts first, then the 2 inner bolts, and hand tighten.
6. Install the bank 2 fuel injection rail. Refer to «Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
7. Tighten the fuel rail bolts in the sequence shown: Tighten Tighten the Bank 1 fuel rail bolts first pass to 12 N.m (106 lb in). Tighten the Bank 1 fuel rail bolts final pass to 23 N.m (17 lb ft).
8. Install a NEW fuel rail crossover pipe. Refer to «Fuel Injection Fuel Rail Crossover Tube Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Install a NEW high pressure fuel pipe. Refer to «Fuel Feed Intermediate Pipe Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
10. Install the high pressure fuel sensor (1). Refer to «Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
11. Connect the fuel injector wiring harness electrical connector (1) to the fuel injectors, fuel rail and fuel pressure sensor.
12. Inspect for fuel leaks using the following procedure: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.
13. Install the foam insulator from the fuel rails.
14. Install the intake manifold. Refer to «Intake Manifold Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
15. Install the fuel pipe shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
16. Install the low side fuel pressure service port cap.
17. Install the fuel tank cap.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Remove the fuel pipe shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Remove the high pressure fuel sensor. Refer to «Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
4. Remove the high pressure fuel pipe. Discard the pipe. Refer to «Fuel Feed Intermediate Pipe Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Remove the crossover tube. Refer to «Fuel Injection Fuel Rail Crossover Tube Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) . Discard this pipe.
6. Remove the fuel rail bolts (1) from both rails for clearances purposes.
7. Carefully remove the Bank 2 fuel rail (2) from the engine. Lift the rear of the rail to ease removal.
8. Remove and discard the direct fuel injector hold down clamps.
9. Once the fuel rail is removed, remove the fuel injectors and rebuild them. Refer to «Fuel Rail and Injectors Cleaning and Inspection (LLT)»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-off-vehicle__fuel-rail-and-injectors-cleaning-and) .

1. Install the rebuilt direct fuel injectors (1) to the cylinder heads. Refer to «Fuel Rail and Injectors Cleaning and Inspection (LLT)»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-off-vehicle__fuel-rail-and-injectors-cleaning-and) .
2. Install new direct injector hold down clamps to the injectors.
3. On the new fuel rail, lubricate the fuel injector cups with silicon free engine oil. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-specifications__adhesives-fluids-lubricants-and-sealers)
4. Carefully place the fuel rail (2) into position, placing the front into the fuel rail over the front injector and rotating the rear downward.
5. Install the 2 outer fuel rail bolts first, then the 2 inner bolts and hand tighten.
6. Tighten the fuel rail bolts in the sequence shown: Tighten the Bank 1 fuel rail bolts first pass to 12 N.m (106 lb in). Tighten the Bank 1 fuel rail bolts a final pass to 23 N.m (17 lb ft).
7. Install a NEW fuel rail crossover tube. Refer to «Fuel Injection Fuel Rail Crossover Tube Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
8. Install a NEW high pressure fuel pipe. Refer to «Fuel Feed Intermediate Pipe Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Install the high pressure fuel sensor. Refer to «Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
10. Connect the fuel injector wiring harness electrical connector (1) from the fuel injectors, fuel rail and fuel pressure sensor.
11. Inspect for fuel leaks using the following procedure: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.
12. Install the fuel pipe shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
13. Install the low side fuel pressure service port cap.
14. Install the fuel tank cap.

1. Remove the fuel injection sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Remove the high pressure pump shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
4. Loosen the fuel rail crossover pipe (1) fitting to the right fuel rail (2).
5. Loosen the fuel rail crossover pipe (1) fitting to the left fuel rail (3).
6. Remove the fuel rail crossover pipe (1) from the vehicle. Discard the pipe.

1. Ensure that the fuel rail crossover pipe, right fuel rails fittings and left fuel rail fittings are clean and dry prior to assembly.
2. Lubricate the pipes with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.
3. Position the fuel rail crossover pipe (1) to the right fuel rails fitting (2) and left fuel rail fitting (3).
4. Tighten the fuel rail crossover pipe fittings. Tighten the fittings first pass to 16 N.m (12 lb ft). Tighten the fittings final pass to 32 N.m (24 lb ft).
5. Inspect for leaks using the following procedure: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.
6. Install the low side fuel pressure service port cap.
7. Install the fuel tank cap.
8. Install the high pressure pump shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Install the fuel injection sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

1. Remove the fuel injection sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Remove the high pressure pump shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Relieve fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
4. Remove the foam insulator from the pipes.
5. Loosen the high pressure pipe fitting to the high pressure fuel pump (1).
6. Loosen the high pressure pipe fitting to the left fuel rail (3).
7. Remove the high pressure fuel pipe (2) from the vehicle. Discard the pipe.

1. Ensure that the NEW high pressure fuel pipe, fuel rail fitting and fuel pump fitting are clean and dry prior to assembly.
2. Lubricate the pipes with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.
3. Position the NEW high pressure fuel pipe (2) to the high pressure fuel pump fitting (1) and left fuel rail (3). hand tighten the fitting.
4. Tighten the high pressure fuel pipe fitting. Tighten the fitting a first pass to 16 N.m (12 lb ft). Tighten the fitting a final pass to 32 N.m (24 lb ft).
5. Inspect for leaks using the following procedure: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.
6. Install the low side fuel pressure service port cap.
7. Install the fuel tank cap.
8. Install the high pressure pump shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Install the fuel injection sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

Scheme 7

Fuel Pipe Shield Replacement

Fuel Pump Replacement (LLT)

Special Tools

EN-48896 High Pressure Fuel Pump Installation Alignment Gauge

1. Relieve the low and high side fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Remove the high pressure fuel pump shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Disconnect the engine wiring harness electrical connector from the high pressure fuel pump.
4. Remove the low pressure feed pipe. Refer to «Fuel Feed Pipe Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Remove the high pressure pipe. Refer to «Fuel Feed Intermediate Pipe Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) . Discard this pipe.
6. Remove and discard the high pressure fuel pump bolts (1).
7. Remove the high pressure fuel pump (2).
8. Remove and discard the high pressure fuel pump O-ring (3).
9. Remove and discard the high pressure fuel pump gasket (4).
10. Remove the high pressure fuel pump roller lifter (5).

1. Use the EN-48896 alignment gauge to ensure that the camshaft lobe is in the base circle position. At base circle the tool will be flush with the head.
2. Lubricate the high pressure fuel pump cylinder head bore and roller lifter with camshaft prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent.
3. Install the high pressure fuel pump roller lifter (5).
4. Install a NEW high pressure fuel pump O-ring (3).
5. Position the NEW high pressure fuel pump gasket (4) and bolts (1) to the fuel pump.
6. Install the high pressure fuel pump (2). Force will be required while hand tightening the bolts.
7. Tighten the high pressure fuel pump retaining bolts to 15 (11 lb ft).
8. Ensure the high pressure fuel pump and fuel rail fittings are clean prior to assembly.
9. Install a NEW high pressure fuel pipe. Refer to «Fuel Feed Intermediate Pipe Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
10. Install the fuel feed pipe to the high pressure fuel pump. Refer to «Fuel Feed Pipe Replacement (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
11. Connect the high pressure fuel pump wiring harness.
12. Install the fuel tank cap.
13. Inspect for leaks using the following procedure: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.
14. Install the pressure relief cap to the fuel feed pipe.
15. Install the high pressure fuel pump shield. Refer to «Fuel Pipe Shield Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

Fuel Injector Replacement (LLT)

Special Tools

1. EN-47909 Injector Bore and Sleeve Cleaning Kit
2. EN-48266 Injector Seal Installer and Sizer
3. J 2619-01 Slide Hammer
4. J-37281-A Injector Remover
5. J 39313 Spark Plug Port Adapter

1. Relieve the high side fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Remove the fuel injection fuel rail assembly. Refer to «Fuel Injection Fuel Rail Assembly Replacement - Bank 1 (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) , or «Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Remove and discard the three fuel injector retaining rings (1).
4. Remove the direct fuel injectors and harness (1) as an assembly, and disconnect the electrical connector (2). If necessary, use the J 2619-01 slide hammer with the J-37281-A injector remover in order to remove the direct fuel injectors evenly.
5. Remove and discard the following components from the fuel injectors (4). Upper O-ring Seal (1) Plastic Spacer (2) Retaining Ring (3) Isolator Cup (5) Teflon Seal (6)
6. Inspect the fuel rail injector bores and clean with the J-39313 adapter , and EN-47909 cleaning kit , if required.

1. Install the following NEW components to the fuel injectors. Use steps 2 through 8 to install these components. Upper O-ring Seal (1) Plastic Spacer (2) Retaining Ring (3) Isolator Cup (5) Teflon Seal (6)
2. From the EN-48266 Installer , position the EN 48266-1 to the injector tip.
3. Install a NEW teflon seal onto the EN 48266-1.
4. Pull the NEW teflon seal by hand over the EN 48266-1 and into the groove in the injector.
5. Remove the EN 48266-1 from the injector tip.
6. From the EN-48266 Installer , install the EN 48266-2 to the injector tip.
7. Using the EN 48266-2, resize the teflon seal. Install the EN 48266-2, until it bottoms out against the injector body, and rotate the EN 48266-2 while applying only moderate force 180 degrees in one direction and then 180 degrees back in the other direction.
8. Remove the EN 48266-2.
9. Install the direct fuel injectors and harness (1) as an assembly and connect the electrical connector (2).
10. Install the fuel injection fuel rail assembly. Refer to «Fuel Injection Fuel Rail Assembly Replacement - Bank 1 (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) , or «Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (LLT)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

Scheme 8

Evaporative Emission Canister Purge Solenoid Valve Replacement

Scheme 9

Evaporative Emission Canister Vent Solenoid Valve Replacement

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (Without CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-without-ch-48027) , «Fuel Pressure Relief (CH-48027)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-ch-48027) , «Fuel Pressure Relief (High Side)»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__fuel-pressure-relief-high-side) .
2. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
3. Remove the intermediate steering shaft. Refer to «Intermediate Steering Shaft Replacement»(/buick/enclave/i-2007-2013/remont/steering-column-switches/#steering-wheel-and-steering-column) .
4. Disconnect the fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
5. Disconnect the evaporative emission (EVAP) pipe (3) quick connect fitting from the EVAP purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
6. Cap the fuel rail and the EVAP purge solenoid in order to prevent possible fuel and/or EVAP system contamination.
7. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
8. Disconnect the fuel pump fuel feed pipe quick connect fitting (6) from the chassis fuel feed pipe. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Disconnect the EVAP canister vent front pipe quick connect fitting (5) from the chassis EVAP pipe. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
10. Remove the fuel feed/EVAP pipe assembly clip (1) from the body.
11. Remove the fuel feed/EVAP pipe assembly clip nut (3) and clip (2) from the stud.
12. Loosen the fuel feed/EVAP pipe clip (4) bolt, and remove the fuel feed/EVAP pipe assembly from the vehicle.

1. Position the fuel feed/EVAP pipe assembly to the vehicle, and tighten the fuel feed/EVAP pipe clip (4) bolt. Tighten Tighten the bolt to 8 N.m (71 lb in).
2. Install the fuel feed/EVAP pipe clip (2) and nut (3) to the stud. Tighten Tighten the nut to 9 N.m (80 lb in).
3. Install the fuel feed/EVAP pipe clip (1) to the body.
4. Connect the EVAP canister vent front pipe quick connect fitting (5) to the chassis EVAP pipe. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Connect the fuel pump fuel feed pipe quick connect fitting (6) to the chassis fuel feed pipe. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
6. Lower the vehicle.
7. Remove the caps from the fuel rail and the EVAP purge solenoid.
8. Connect the EVAP pipe (3) quick connect fitting to the EVAP purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Connect the fuel feed pipe (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
10. Tighten the fuel fill cap.
11. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
12. Install the intermediate steering shaft. Refer to «Intermediate Steering Shaft Replacement»(/buick/enclave/i-2007-2013/remont/steering-column-switches/#steering-wheel-and-steering-column) .
13. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

Scheme 10

Evaporative Emission Canister Vent Front Pipe Replacement

Scheme 11

Evaporative Emission Canister Vent Rear Pipe Replacement

Scheme 12

Evaporative Emission Canister Replacement

Evaporative Emission System Cleaning

Special Tools

J 41413 EVAP Pressure and Purge Station

Inspection Procedure

1. Turn OFF the ignition.
2. Remove the EVAP canister purge valve. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Lightly tap the EVAP canister purge valve on a hard surface.
4. Inspect for carbon particles exiting either of the vacuum ports. If no carbon particles were detected, but a blockage was detected during a diagnostic procedure, install the original EVAP canister purge valve. Continue with the cleaning procedure. If carbon particles are found during the inspection procedure, continue with the cleaning procedure. If a diagnostic procedure directed you to replace the EVAP canister purge valve and no carbon particles were detected, replace the EVAP canister purge valve. Return to the published service procedure.

Cleaning Procedure

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the EVAP canister. Refer to «Evaporative Emission Canister Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Turn OFF the main valve on the J 41413 EVAP pressure and purge station.
4. Disconnect the hose from the diagnostic station pressure regulator.
5. Using a section of vacuum hose, connect one end onto the EVAP pressure/purge diagnostic station pressure regulator.
6. Connect the other end of the vacuum hose to the canister side of the purge pipe.
7. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
8. If the nitrogen does not clear the blockage, replace the purge pipe.
9. Return the EVAP pressure/purge diagnostic station to the stations original condition.
10. Install a new EVAP canister. Refer to «Evaporative Emission Canister Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
11. Lower the vehicle.
12. Install a new EVAP canister purge valve. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
13. Return to the diagnostic table that sent you here.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Disconnect the engine wiring harness electrical connector(s) (1) from the ignition coil(s) (4).
3. Remove the ignition coil bolt(s).
4. Remove the ignition coil(s).

1. Install the ignition coil(s).
2. Install the ignition coil bolt(s). Tighten Tighten the bolt(s) to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector(s) (1) to the ignition coil(s) (4).
4. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

1. Remove the intake manifold. Refer to «Intake Manifold Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle)
2. Disconnect the engine wiring harness electrical connector(s) (5) from the ignition coil(s) (4).
3. Remove the ignition coil bolt(s).
4. Remove the ignition coil(s).

1. Install the ignition coil(s).
2. Install the ignition coil bolt(s). Tighten Tighten the bolt(s) to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector(s) (5) to the ignition coil(s) (4).
4. Install the intake manifold. Refer to «Intake Manifold Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle)

Spark Plug Usage

1. Ensure that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to the Electronic Parts Catalog.
2. Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions: Spark plug fouling-Colder plug Pre-ignition causing spark plug and/or engine damage-Hotter plug

Spark Plug Inspection

1. Inspect the terminal post (1) for damage. Inspect for a bent or broken terminal post (1). Test for a loose terminal post (1) by twisting and pulling the post. The terminal post (1) should NOT move.
2. Inspect the insulator (2) for flashover or carbon tracking, soot. This is caused by the electrical charge traveling across the insulator (2) between the terminal post (1) and ground. Inspect for the following conditions: Inspect the spark plug boot for damage. Inspect the spark plug recess area of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated causes arcing to ground.
3. Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3, 4).
4. Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3) terminals. Refer to «Ignition System Specifications»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-specifications__ignition-system-specifications) . An excessively wide electrode gap can prevent correct spark plug operation. Inspect for the correct spark plug torque. Refer to «Ignition System Specifications»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-specifications__ignition-system-specifications) . Insufficient torque can prevent correct spark plug operation. An over torqued spark plug, causes the insulator (2) to crack. Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode (4). Inspect for a broken or worn side electrode (3). Inspect for a broken, worn, or loose center electrode (4) by shaking the spark plug. A rattling sound indicates internal damage. A loose center electrode (4) reduces the spark intensity. Inspect for bridged electrodes (3, 4). Deposits on the electrodes (3, 4) reduce or eliminates the gap. Inspect for worn or missing platinum pads on the electrodes (3, 4), if equipped. Inspect for excessive fouling.
5. Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation.

Spark Plug Visual Inspection

1. Normal operation-Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives.
2. Carbon fouled-Dry, fluffy, black carbon or soot caused by the following conditions: Rich fuel mixtures Leaking fuel injectors Excessive fuel pressure Restricted air filter element Incorrect combustion Reduced ignition system voltage output Weak coils Worn ignition wires Incorrect spark plug gap Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
3. Deposit fouling-Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark intensity. Most powdery deposits will not effect spark intensity unless they form into a glazing over the electrode.

1. Remove the ignition coil(s). Refer to «Ignition Coil Replacement - Bank 1»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) , and/or «Ignition Coil Replacement - Bank 2»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
2. Use compressed air in order to remove debris from the spark plug cavity.
3. Remove the spark plug.

1. Ensure that the spark plug gap is equivalent to the spark plug gap specification. Refer to «Ignition System Specifications»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-specifications__ignition-system-specifications) .
2. Install the spark plug and tighten to 18 N.m (13 lb ft)..
3. Install the ignition coil(s). Refer to «Ignition Coil Replacement - Bank 1»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) , and/or «Ignition Coil Replacement - Bank 2»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

1. Remove the exhaust manifold lower heat shield. Refer to «Exhaust Manifold Lower Heat Shield Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
2. Disconnect the engine wiring harness electrical connector (3) from the crankshaft position (CKP) sensor (4).
3. Remove the crankshaft sensor bolt.
4. Remove the crankshaft sensor.

1. Install the crankshaft position sensor.
2. Install the crankshaft position sensor bolt and tighten to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector (3) to the CKP sensor (4).
4. Install the exhaust manifold lower heat shield. Refer to «Exhaust Manifold Lower Heat Shield Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .

1. Remove the engine mount strut bracket. Refer to «Engine Mount Strut Bracket Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Disconnect the engine wiring harness electrical connector (3) from the bank 2 exhaust camshaft position (CMP) sensor (4).
3. Remove the CMP sensor bolt and sensor (4).

1. Install the CMP sensor (4) and bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
2. Connect the engine wiring harness electrical connector (3) to the bank 2 exhaust CMP sensor (4).
3. Install the engine mount strut bracket. Refer to «Engine Mount Strut Bracket Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

1. Remove the engine mount strut bracket. Refer to «Engine Mount Strut Bracket Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Remove the radiator inlet hose from the water outlet. Refer to «Radiator Inlet Hose Replacement»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the power steering fluid reservoir bracket bolts (1).
4. Remove and reposition the power steering fluid reservoir bracket (2) out of the way.
5. Disconnect the engine wiring harness electrical connector (8) from the bank 2 intake camshaft position (CMP) sensor (7).
6. Remove the CMP sensor bolt and sensor (3).

1. Install the CMP sensor (3) and bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
2. Connect the engine wiring harness electrical connector (8) to the bank 2 intake CMP sensor (7).
3. Position and install the power steering fluid reservoir bracket (2).
4. Install the power steering fluid reservoir bracket bolts (1). Tighten Tighten the bolts to 9 N.m (8 lb in).
5. Install the radiator inlet hose to the water outlet. Refer to «Radiator Inlet Hose Replacement»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Install the engine mount strut bracket. Refer to «Engine Mount Strut Bracket Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

1. Disconnect the engine wiring harness electrical connector (7) from the bank 1 exhaust camshaft position (CMP) sensor (6).
2. Remove the CMP sensor bolt and sensor (1).

1. Install the CMP sensor (1) and bolt. Tighten the bolt to 10 N.m (89 lb in).
2. Connect the engine wiring harness electrical connector (7) to the bank 1 exhaust CMP sensor (6).

1. Disconnect the engine wiring harness electrical connector (1) from the bank 1 intake camshaft position (CMP) sensor (2).
2. Remove the CMP sensor bolt and sensor (2).

1. Install the CMP sensor (2) and bolt. Tighten the bolt to 10 N.m (89 lb in).
2. Connect the engine wiring harness electrical connector (1) to the bank 1 intake CMP sensor (2).

1. Disconnect the engine wiring harness electrical connector (8) from the bank 1 intake CMP actuator solenoid valve.
2. Remove the CMP actuator solenoid valve bolt and valve (2).
3. Inspect the CMP actuator solenoid valve seal and replace as necessary.

1. Inspect the CMP actuator solenoid valve seal for damage. Replace the seal if necessary.
2. Install the CMP actuator solenoid valve (2) and bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector (8) to the bank 1 intake CMP actuator solenoid valve.

1. Disconnect the engine wiring harness electrical connector (5) from the bank 1 exhaust camshaft position (CMP) actuator solenoid valve.
2. Remove the CMP actuator solenoid valve bolt and valve (1).
3. Inspect the CMP actuator solenoid valve seal and replace as necessary.

1. Inspect the CMP actuator solenoid valve seal for damage. Replace the seal if necessary.
2. Install the CMP actuator solenoid valve (1) and bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector (5) to the bank 1 exhaust CMP actuator solenoid valve.

1. Remove the engine mount strut bracket. Refer to «Engine Mount Strut Bracket Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Remove the radiator inlet hose from the water outlet. Refer to «Radiator Inlet Hose Replacement»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the power steering fluid reservoir bracket bolts (1).
4. Remove and reposition the power steering fluid reservoir bracket (2) out of the way.
5. Disconnect the engine wiring harness electrical connector (6) from the bank 2 intake camshaft position (CMP) actuator solenoid valve.
6. Remove the CMP actuator solenoid valve bolt and valve (3).
7. Inspect the CMP actuator solenoid valve seal for damage and replace as necessary.

1. Inspect the CMP actuator solenoid valve seal for damage. Replace the seal if necessary.
2. Install the CMP actuator solenoid valve (3) and bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector (6) to the bank 2 intake CMP actuator solenoid valve.
4. Position and install the power steering fluid reservoir bracket (2).
5. Install the power steering fluid reservoir bracket bolts (1). Tighten Tighten the bolts to 9 N.m (80 lb in).
6. Install the radiator inlet hose to the water outlet. Refer to «Radiator Inlet Hose Replacement»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Install the engine mount strut bracket. Refer to «Engine Mount Strut Bracket Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

1. Remove the engine mount strut bracket. Refer to «Engine Mount Strut Bracket Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Disconnect the engine wiring harness electrical connector (5) from the bank 2 exhaust camshaft position (CMP) actuator solenoid valve.
3. Remove the CMP actuator solenoid valve bolt and valve (4).
4. Inspect the CMP actuator solenoid valve seal for damage and replace as necessary.

1. Inspect the CMP actuator solenoid valve seal for damage. Replace the seal if necessary.
2. Install the CMP actuator solenoid valve (4) and bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector (5) to the bank 2 exhaust CMP actuator solenoid valve.
4. Install the engine mount strut bracket. Refer to «Engine Mount Strut Bracket Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

1. Remove the exhaust manifold lower heat shield. Refer to «Exhaust Manifold Lower Heat Shield Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
2. Disconnect the engine wiring harness electrical connector (1) from the bank 1 knock sensor (2).
3. Loosen the knock sensor bolt and remove the knock sensor.

1. Position the knock sensor and tighten the knock sensor bolt. Tighten Tighten the bolt to 23 N.m (17 lb ft).
2. Connect the engine wiring harness electrical connector (1) to the bank 1 knock sensor (2).
3. Install the exhaust manifold lower heat shield. Refer to «Exhaust Manifold Lower Heat Shield Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/enclave/i-2007-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Remove the engine oil filter. Refer to «Engine Oil and Oil Filter Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
3. Lower the vehicle.
4. Disconnect the engine wiring harness electrical connector (2) from the bank 2 knock sensor (3).
5. Loosen the knock sensor bolt and remove the knock sensor.

1. Position the knock sensor and tighten the knock sensor bolt. Tighten Tighten the bolt to 23 N.m (17 lb ft).
2. Connect the engine wiring harness electrical connector (2) to the bank 2 knock sensor (3).
3. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
4. Install a NEW engine oil filter. Refer to «Engine Oil and Oil Filter Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
5. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/enclave/i-2007-2013/remont/charging-system/#battery-charging-system-and-starting-system) .

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Disconnect the PCV quick disconnect (2). Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Disconnect the engine wiring harness electrical connector from the mass airflow (MAF)/intake air temperature (IAT) sensor.
4. Disconnect the windshield washer hose clip from the corner of the air cleaner housing.
5. Loosen the air cleaner outlet duct clamp (1) at the throttle body.
6. Loosen the 6 air cleaner housing cover screws (2).
7. Separate the air cleaner outlet duct from the throttle body.
8. Remove the air cleaner housing cover (3) (with outlet duct).
9. Remove and discard the air cleaner element (4).

1. Install a NEW air cleaner element (4).
2. Position the air cleaner housing cover (3) (with outlet duct) onto the air cleaner lower housing.
3. Connect the windshield washer hose clip to the air cleaner housing cover.
4. Install the air cleaner outlet duct onto the throttle body.
5. Tighten the 6 air cleaner housing cover screws (2).
6. Tighten the air cleaner outlet duct clamp (1) at the throttle body. Tighten Tighten the clamp to 4 N.m (35 lb in).
7. Connect the engine wiring harness electrical connector to the MAF/IAT sensor.
8. Connect the PCV quick disconnect (2). Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
9. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

1. Remove the air cleaner element. Refer to «Air Cleaner Element Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
2. Remove the air cleaner lower housing screws (1).
3. Remove the hood release cable clip (1) from the air cleaner lower housing.
4. Disconnect the fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
5. Disconnect the evaporative emission (EVAP) pipe (3) quick connect fitting from the EVAP purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
6. Gently lift up the retaining tab (1) and remove the ECM from the bracket, reposition out of the way.
7. Remove the air cleaner lower housing.

1. Position the air cleaner lower housing to the side rail.
2. Position and install the ECM to the bracket.
3. Connect the evaporative emission (EVAP) pipe (3) quick connect fitting to the EVAP purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
4. Connect the fuel feed pipe (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions__metal-collar-quick-connect-fitting-service) .
5. Install the hood release cable clip (1) to the air cleaner lower housing.
6. Install the air cleaner lower housing screws (1). Tighten Tighten the screws to 9 N.m (80 lb in).
7. Install the air cleaner element. Refer to «Air Cleaner Element Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
2. Disconnect the PCV quick disconnect (2). Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Loosen the air cleaner outlet duct clamps (1) at the mass air flow (MAF)/intake air temperature (IAT) sensor and throttle body.
4. Remove the air cleaner outlet duct.

1. Loosely Install the air cleaner outlet duct then install the fuel injector sight shield to ensure proper clearance.
2. Remove the fuel injector sight shield.
3. Tighten the air cleaner outlet duct clamps (1) to 4 N.m (35 lb in)at the MAF/IAT sensor and throttle body.
4. Connect the PCV quick disconnect (2). Refer to «Plastic Collar Quick Connect Fitting Service»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
5. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .

See also:
• Diagnostic Trouble Code (DTC) List - Vehicle
• Control Module References
• Battery Negative Cable Disconnection and Connection
• Fastener Caution
• Engine Control Module Programming and Setup
• Cooling System Draining and Filling (Static Fill)
• Fuel Injector Sight Shield Replacement
• Heated Oxygen and Oxygen Sensor Caution
• Lifting and Jacking the Vehicle
• Instrument Panel Insulator Panel Replacement - Left Side (Enclave)
• Adhesives, Fluids, Lubricants, and Sealers
• Gasoline/Gasoline Vapors Warning
• Electrical Center Identification Views
• Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution
• Relieving Fuel Pressure Warning
• Fuel Pipe Fitting Warning
• Safety Glasses Warning
• Underbody Rear Side Rail Replacement
• Tire and Wheel Removal and Installation
• Brake Pressure Modulator Valve Replacement
• Intermediate Steering Shaft Replacement
• Fuel Rail and Injectors Cleaning and Inspection (LLT)
• Ignition System Specifications
• Safety Glasses and Compressed Air Warning
• Exhaust Manifold Lower Heat Shield Replacement
• Air Cleaner Outlet Duct Replacement
• Fuel Pressure Relief (Without CH-48027)
• Fuel Pressure Relief (CH-48027)
• Fuel Pressure Relief (High Side)
• Fuel Tank Draining
• Fuel Tank Module Replacement
• Metal Collar Quick Connect Fitting Service
• Fuel Injector Replacement (LLT)