Engine Controls - Removal & Installation - Trucks Cadillac Escalade GMT400

MODEL IDENTIFICATION

Vehicle model is identified by fifth character of Vehicle Identification Number (VIN). VIN is stamped on metal pad on top of left end of instrument panel, near windshield. See MODEL IDENTIFICATION table.

MODEL IDENTIFICATION

INTRODUCTION

This article covers removal, overhaul and installation procedures (when given by manufacturer). If component removal and installation is primarily an unbolt and bolt-on procedure, only a torque specification may be supplied.

POWERTRAIN CONTROL MODULE (PCM)

Note. All vehicles are equipped with either an Engine Control Module (ECM), Powertrain Control Module (PCM) or Vehicle Control Module (VCM) for engine control. Unless specifically stated, references to PCM also apply to ECM and VCM equipped vehicles. Some vehicles equipped with an electronically-controlled transmission also use a Transmission Control Module (TCM) for transmission control.

Note. Before replacing PCM, carefully inspect all wiring and control components. Failure to test for short circuits may result in repeated PCM failure due to shorts and Quad-Driver failure. To prevent internal damage to PCM, ensure ignition switch is in OFF position when connecting or disconnecting PCM connectors or any electrical components.

Note. On 4.3L, 5.0L, 5.7L and 7.4L, new PCM does not come equipped with knock sensor module. When replacing defective PCM, remove knock sensor module from defective PCM. Install knock sensor module into new PCM.

Ensure ignition switch is in OFF position. Disconnect negative battery cable. Disconnect harness connectors from PCM. Remove PCM from vehicle. On 4.3L, 5.0L, 5.7L and 7.4L, remove access cover and remove knock sensor module from PCM.

Note. On all models except 1.6L and 2.0L, after installation of a NEW PCM, Malfunction Indicator Light (MIL) will remain on until PCM is programmed.

On 4.3L, 5.0L, 5.7L and 7.4L, install knock sensor module in NEW PCM. Install access cover. On all models, install PCM into vehicle. Connect harness connectors to PCM. Reconnect negative battery cable. If NEW PCM has been installed, PCM MUST BE programmed. See 2000 COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

ELECTRICALLY ERASABLE PROGRAMMABLE READ-ONLY MEMORY (EEPROM)

EEPROM is a permanent memory that is part of PCM. EEPROM cannot be replaced. EEPROM contains program and calibration information that PCM uses to control powertrain. If PCM is replaced, ensure that NEW PCM software/calibration is correct and most recent version for vehicle. EEPROM must be programmed when NEW PCM is installed. Program EEPROM using latest software for that specific vehicle. See 2000 COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

KNOCK SENSOR (KS) MODULE

Note. On 4.3L, 5.0L, 5.7L and 7.4L, knock sensor module is a separate module attached to PCM. On all other models, knock sensor module is an integral part of PCM.

Removal & Installation (4.3L, 5.0L, 5.7L & 7.4L)

1. KS module is located in PCM. Disconnect negative battery cable. Remove PCM from vehicle. See «POWERTRAIN CONTROL MODULE (PCM)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__powertrain-control-module-pcm) under COMPUTERIZED ENGINE CONTROLS. Position PCM with access cover up. Remove access cover from PCM.
2. Using thumb and forefinger, squeeze both ends of knock sensor module inward and pull module up from access hole. To install, reverse removal procedure. Ensure module latches into holder in PCM.

Removal & Installation (2.2L & 3.4L)

Disconnect negative battery cable. Disconnect connectors at ignition control module. Disconnect spark plug wires from coil pack. Remove coil pack/ignition control module assembly. Separate ignition coils from ignition control module. To install, reverse removal procedure. Tighten coil pack/ignition control module assembly bolts to specification. See TORQUE SPECIFICATIONS .

Removal & Installation (4.8L, 5.3L & 6.0L)

Note. Ignition control module and ignition coil can not be serviced separately. Replace module and coil as an assembly.

For ignition control module removal and installation, see IGNITION COIL .

Removal & Installation (Except 1.6L & 2.0L)

On engines with a distributor, CMP sensor is located within the distributor. Remove screw and remove CMP sensor from distributor. (Scheme 4) On engines with distributorless ignition, CMP sensor is located in the engine block adjacent to cam. (Scheme 2)- (Scheme 5).

Removal (1.6L & 2.0L)

Disconnect CMP harness connector. Remove 2 CMP sensor mounting bolts. Remove CMP sensor.

1. Install NEW "O" ring on CMP sensor and coat with engine oil. Install CMP sensor while aligning drive coupling into slot of camshaft. (Scheme 1) CMP sensor drive coupling and camshaft slot are offset. If CMP sensor coupling does not fit into slot, turn CMP sensor shaft 180 degrees.
2. Tighten CMP sensor bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks). Reconnect CMP sensor harness connectors. Adjust ignition timing to specification. See appropriate ON-VEHICLE ADJUSTMENTS article.

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

CRANKSHAFT POSITION (CKP) SENSOR

Note. Some models required CRANKSHAFT POSITION (CKP) SENSOR VARIATION LEARN PROCEDURE to be performed when CKP sensor is removed or replaced. See 2000 COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

Removal & Installation (Except 2.0L & 3.4L 24X Sensor)

Disconnect CKP sensor harness connector. Remove CKP sensor retaining bolt. Remove CKP sensor. (Scheme 7)- (Scheme 13). To install, reverse removal procedure.

Removal & Installation (2.0L)

1. Disconnect the electrical connector from the crankshaft position (CKP) sensor.
2. Remove the transmission from the vehicle. Refer to «REMOVAL & INSTALLATION (TRACKER)»(/cadillac/escalade/gmt400-1998-2000/remont/automatic-trans/#automatic-transmission-removal-installation__removal-installation-tracker) for A/T or «CLUTCH ASSEMBLY»(ref-1120-S27521579192000031300000) for M/T.
3. Remove the flywheel or the flex plate from the crankshaft.
4. Remove the 2 bolts (3) and the sensor wire harness clips or shield.
5. Remove the bolt (4) securing the CKP sensor to the engine block (5).
6. Remove the CKP sensor (1) and the wire harness (2) from the vehicle.
7. Inspect the CKP sensor signal rotor for damaged or missing teeth through the CKP sensor opening.
8. To install, reverse removal procedure. Lubricate CKP sensor O-ring with clean engine oil.

Scheme 6

Removal & Installation (3.4L 24X Sensor)

Disconnect CKP sensor harness connector. Remove accessory drive belts. Remove crankshaft pulley. Remove CKP sensor retaining bolts. Remove CKP sensor. (Scheme 10) To install, reverse removal procedure. Adjust accessory drive belts.

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Removal & Installation (1.6L & 2.0L)

Disconnect negative battery cable. Disconnect spark plug wire of ignition coil from spark plug. Disconnect electrical connector from ignition coil. Remove 2 bolts attaching ignition coil to valve cover. Remove ignition coil. To install, reverse removal procedure. Tighten ignition coil mounting bolts to specification. See TORQUE SPECIFICATIONS .

Disconnect negative battery cable. Remove spark plug wires from ignition coils. Remove bolts attaching ignition coils to ignition control module. Remove ignition coils. To install, reverse removal procedure.

Disconnect negative battery cable. Disconnect electrical connectors from ignition coils. Remove spark plug wires from ignition coils. Remove studs attaching ignition coil bracket to valve cover. Remove ignition coil bracket. To install, reverse removal procedure. Tighten ignition coil bracket studs to specification. See TORQUE SPECIFICATIONS .

Removal (4.3L, 5.0L, 5.7L & 7.4L)

Disconnect negative battery cable. Disconnect harness connectors to distributor. Remove distributor cap and move aside. Remove distributor hold-down bolt and hold-down clamp. Note position of rotor. Pull up slightly on distributor until rotor stops turning counterclockwise and again note position of rotor. Remove distributor from engine.

Disassembly & Reassembly

Disassembly procedure is not available from manufacturer. Manufacturer recommends replacement as a unit.

1. To install, reverse removal procedure. To ensure correct timing of distributor, install with rotor positioned as it was when distributor was removed.
2. If engine was cranked after distributor was removed, remove spark plug No. 1. Place finger over cylinder No. 1 spark plug hole. Crank engine slowly until compression is felt. Align timing mark on pulley to "0" on engine timing indicator. Ensure rotor points to cylinder No. 1 spark plug tower on distributor cap. Complete distributor installation. Start engine and check ignition timing.

DISTRIBUTOR - 4.3L V6 - (HVI - HIGH VALUE IGNITION SYSTEM)

The M/L model vehicles equipped with 4.3L (VIN W) engine use the HVI system. The "distributor" is called the High Voltage Switch (HVS). System is also referred to as the HVI/HVS system. The HVS includes a camshaft position sensor.

1. Ensure ignition is off. Disconnect spark plugs and coil leads from HVS cap. Disconnect 3-wire camshaft position sensor plug from base of HVS. Remove 2 screws holding cap to HVS housing.
2. Mark HVS cap with a grease pencil to indicate position of rotor to housing. Loosen mounting clamp hold-down bolt and slide clamp back.
3. Remove HVS. (Scheme 14) When HVS is being removed rotor will rotate approximately 42 degrees. Place a second mark at this position for reassembly reference. If the original HVS is being replaced, transfer marks made during removal to replacement component.

Note. If engine crankshaft has been rotated since HVS was removed, marks made during removal to aide installation are no longer valid. If this condition exists, start installation procedure at Step 4 ).

1. Align rotor to second mark made during removal. Guide HVS into engine. Ensure rotor rotates approximately 42 degrees during installation. When HVS is completely seated in position ensure rotor aligns with initial mark made during removal.
2. If rotor and mark are not aligned, HVS and camshaft have meshed one or more teeth out of time. Remove HVS and reinstall. Once marks are aligned and HVS is in correct position, position mounting clamp and tighten to 20 ft. lbs. (27 N.m).
3. Install cap and 3-wire camshaft position sensor connector. Connect spark plug and coil wires. Start engine. If CHECK ENGINE LIGHT is on or DTC 1345 is set, go to next step to check or reset distributor position. If not, installation is correct.
4. Position engine crankshaft at TDC position for No. 1 cylinder. Ensure piston is on compression stroke. Align pre-drilled indent hole in HVS driven gear with arrow cast into upper portion of shaft housing. The rotor should point to the cap hold down mount nearest the flat side of the housing. (Scheme 15)
5. Use a long screwdriver to align oil pump drive shaft position, in engine, with position of HVS drive tab. Guide HVS into place. Ensure locating slot in HVS base is over dowel pin.
6. With HVS fully seated, ensure rotor tip is now aligned with pointer cast into HVS base. (Scheme 15) Pointer has a "6" cast into it (to indicate unit is for a 6-cylinder engine). If rotor and pointer are not closely aligned (within a few degrees), HVS may be out of time by a tooth. Repeat installation procedure.
7. Once marks are aligned and HVS is in correct position, position mounting clamp and tighten to 20 ft. lbs. (27 N.m). Install cap and 3-wire camshaft position sensor connector. Connect spark plug and coil wires.
8. Start engine. If CHECK ENGINE LIGHT is on or DTC 1345 is set, check distributor position and installation procedure.

Scheme 14

Scheme 15

DISTRIBUTOR - 5.0L & 5.7L V8 - (HVI - HIGH VALUE IGNITION SYSTEM)

The C/K model vehicles equipped with a 5.0L or 5.7L engine use the HVI system. The "distributor" is called the High Voltage Switch (HVS). System is also referred to as the HVI/HVS system. The HVS includes a camshaft position sensor.

Note. There are two procedures available to install the distributor. Use installation procedure No. 1 when the crankshaft has NOT been rotated from the original position. Use installation procedure No. 2 when any of the following components are removed: Intake Manifold Cylinder Head Camshaft Timing Chain or Sprockets Complete Engine

1. Turn OFF the ignition switch.
2. Remove the spark plug wires from the distributor cap.
3. Remove the electrical connector from the base of the distributor.
4. Remove the two screws that hold the distributor cap to the housing.
5. Discard the screws.
6. Remove the distributor cap from the housing.
7. Use a grease pencil in order to note the position of the rotor in relation to the distributor housing. The mark is identified in the illustration as the number "1". (Scheme 16)
8. Mark the distributor housing and the intake manifold with a grease pencil.
9. Remove the mounting clamp hold down bolt.
10. Remove the distributor. (Scheme 17)
11. As the distributor is being removed from the engine, watch the rotor move in a counter-clockwise direction about 42 degrees. this will appear as slightly more than one o'clock position.
12. Note the position of the rotor segment. Place a second mark on the base of the distributor. This will aid in achieving proper rotor alignment during the distributor installation. The second mark on the distributor housing is identified in the graphic as number 2. (Scheme 18)

Installation - Procedure 1

1. If Installing a new distributor assembly, place two marks on the new distributor housing in the same location as the two marks on the original housing.
2. Remove the new distributor cap, if necessary.
3. Align the rotor with mark made at location 2. (Scheme 18)
4. Guide the distributor into the engine. Make sure that the mounting hole in the distributor hold-down base is aligned over the mounting hole in the intake manifold.
5. As the distributor is being installed, observe the rotor moving in a clockwise direction about 42 degrees.
6. Once the distributor is completely seated, the rotor segment should be aligned with the mark on the distributor base in the location number "1". (Scheme 16) If the rotor segment is not aligned with the number "1" mark, the driven gear teeth and the camshaft have meshed one or more teeth out of alignment. In order to correct this condition, remove the distributor and reinstall it.
7. Install the distributor mounting clamp. Tighten the distributor clamp bolt to 18 ft. lbs. (25 N.m). Install the distributor cap.
8. Install two NEW distributor cap screws. Tighten the screws to 21 INCH lbs. (2.4 N.m). (Scheme 19)
9. Install the electrical connector to the distributor.
10. Install the spark plug wires to the distributor cap.

Installation - Procedure 2

1. Position No. 1 cylinder to Top Dead Center (TDC) of the compression stroke.
2. Align white paint mark on the bottom stem of the distributor, and the pre-drilled indent hole in the bottom of the gear (3 in illustration). (Scheme 20)
3. With the gear in this position, the rotor segment should be positioned as shown (2 in illustration). (Scheme 20) The alignment will not be exact. If the driven gear is installed incorrectly, the dimple will be approximately 180 degrees opposite the rotor segment when it is installed in the distributor. NOTE: The OBD II ignition system distributor driven gear and rotor can be installed in multiple positions. In order to avoid mistakes, make sure to mark the distributor in the following positions: The distributor driven gear. The distributor shaft. The rotor holes for the same mounting position upon reassembly. Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition. Premature engine wear or damage may result.
4. Using a long screw driver, align the oil pump drive shaft to the drive tab of the distributor.
5. Guide the distributor into the engine. Ensure the spark plug towers are perpendicular to the centerline of the engine.
6. Once the distributor is properly seated, the rotor segment should be aligned with the pointer cast into the distributor base. The pointer must have an "8" cast onto it (a "6" indicates a V6 engine component). (Scheme 21) If the segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more. If this is the case, repeat the procedure again in order to achieve proper alignment.
7. Install the distributor mounting clamp. Tighten the distributor clamp bolt to 18 ft. lbs. (25 N.m). Install the distributor cap.
8. Install the New distributor cap screws. Tighten the screws to 21 INCH lbs. (2.4 N.m). (Scheme 19)
9. Install the electrical connector to the distributor. Install the spark plug wires to the distributor. CAUTION: If the malfunction indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly. Refer to installation Procedure 2 for proper distributor installation.

1. Remove the air cleaner assembly. Disconnect the electrical connectors.
2. Remove the ignition coil wire to the distributor.
3. Remove the studs holding the bracket and the ignition coil to the intake manifold.
4. Remove the bracket and the ignition coil. Drill and punch out the two rivets holding the ignition coil to the bracket.
5. Remove the ignition coil from the bracket. (Scheme 22)

1. A replacement ignition kit comes with two screws in order to attach the ignition coil to the bracket. Install the ignition coil to the bracket with the two screws.
2. Install the ignition coil and the bracket to the intake manifold with studs. (Scheme 22) Tighten the studs to 8 ft. lbs. (11 N.m).
3. Install the ignition coil wire. Install the electrical connectors. Install the air cleaner assembly.

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

KNOCK SENSOR (KS)

Note. Cooling system may require draining prior to removing knock sensor.

Knock sensor is located on side of engine block. (Scheme 23)- (Scheme 25). Disconnect negative battery cable. On 4.8L, 5.3L and 6.0L, remove intake manifold. On all models, disconnect wiring harness connector from knock sensor. Remove knock sensor. To install, reverse removal procedure. Install sealant to sensor threads prior to installation. Tighten knock sensor to 14 ft. lbs. (19 N.m).

Scheme 23

Scheme 24

Scheme 25

FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)

Fuel system is under pressure. Pressure must be relieved prior to servicing fuel system. Fuel pressure may be relieved by using one of the following methods.

1. On 1.6L and 2.0L, loosen fuel filler cap to release fuel tank pressure (do not tighten at this time). Remove fuel pump relay. Start and run engine until it stalls. Crank starter for 3 seconds to remove remaining fuel from fuel lines. Turn ignition off. Reinstall fuel pump relay. Disconnect negative battery cable to avoid possible fuel discharge in accidental attempt to start engine.
2. On all models except 1.6L and 2.0L, disconnect negative battery terminal. Loosen fuel filler cap. Install Fuel Pressure Gauge (J-34730-1A) on fuel pressure connector of fuel rail. Wrap shop towel around pressure connection when installing fuel pressure gauge to absorb fuel leakage. Install gauge bleed hose in container. Open bleed valve to bleed fuel pressure.

Removal Procedure (Montana, Silhouette & Venture)

Scheme 26

1. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi).
2. Raise the vehicle.
3. Remove the quick-connect fitting at the inlet of the in-pipe fuel filter.
4. Remove the quick-connect fitting at the outlet of the in-pipe fuel filter.
5. Drain any remaining fuel into an approved gasoline container.
6. Remove the in-pipe fuel filter mounting bracket attaching nut. (Scheme 26)
7. Remove the in-pipe fuel filter and mounting bracket.
8. Remove the in-pipe fuel filter from the in-pipe fuel filter mounting bracket.
9. Remove the original fuel feed pipe and discard.

Installation Procedure (Montana, Silhouette & Venture)

1. Install the supplied fuel feed pipe from the fuel filter kit in the same orientation as the original.
2. Remove the protective caps from the new in-pipe fuel filter.
3. Install the in-pipe fuel filter into the in-pipe fuel filter mounting bracket so the flow indicator arrow points towards the front of the vehicle.
4. Install the in-pipe fuel filter and mounting bracket.
5. Reinstall the in-pipe fuel filter mounting bracket attaching nut. (Scheme 26) Tighten: Tighten the nut to 10 N.m (89 lb in).
6. Connect the quick-connect fitting at the inlet of the in-pipe fuel filter.
7. Connect the quick-connect fitting at the outlet of the in-pipe fuel filter.
8. Lower the vehicle.
9. Tighten the fuel fill cap.
10. Reconnect the negative battery cable.
11. Inspect for fuel leaks. Turn the ignition switch ON for 2 seconds. Turn the ignition switch OFF for 10 seconds. Turn the ignition switch ON. Check for fuel leaks.

Removal Procedure (Astro, Safari)

1. Disconnect the negative battery cable.
2. Relieve fuel pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi)
3. Remove the fuel feed pipe nuts (1) from both sides of the fuel filter.
4. Remove the fuel filter clamp bolt (1).
5. Remove the filter (4) and the clamp (3) from fuel lines.

Remove the clamp from the fuel filter.

Installation Procedure (Astro, Safari)

Install the clamp onto the fuel filter.

1. Install the fuel filter (4) and clamp (3) to the fuel pipe. (Scheme 29)
2. Install the clamp bolt (1). (Scheme 28)
3. Install the fuel feed pipe nuts (1). (Scheme 27) Tighten Tighten the fuel feed pipe nuts to 25 Nm (18 lb ft). CAUTION: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
4. Connect the negative battery cable.
5. Check for leaks.

Removal Procedure (Blazer, Bravada, Envoy, Jimmy, S10 Pickup, Sonoma)

1. Relieve the fuel pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .
2. Remove the fuel filler cap.
3. Remove the fuel feed nut and plastic quick connect fitting from either side of the filter.
4. Remove the clamp bolt.
5. Remove the filter and the clamp from fuel lines.
6. Remove the clamp from filter.

Installation Procedure (Blazer, Bravada, Envoy, Jimmy, S10 Pickup, Sonoma)

1. Install the clamp to filter. (Scheme 30)
2. Install the filter and clamp to fuel lines. see scheme 31
3. Install the filter and clamp to fuel lines.
4. Install the fuel feed nut and plastic quick connect fitting on either side of the fuel filter. see scheme 30
5. Install the fuel filler cap.
6. Check for leaks.

Removal Procedure (Express)

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .
3. Disconnect the fuel feed pipes (5) at the filter (4).
4. Remove the in-line fuel filter clamp attaching hardware.
5. Remove the clamp from the filter.

Installation Procedure (Express)

1. Remove the protective caps from the new filter.
2. Install the clamp to the filter.
3. Install the in-line filter clamp attaching hardware. Install in the same positions as on the old filter noting direction of fuel flow arrow.
4. Connect the fuel feed pipes (5) to the filter (4) and tighten. (Scheme 31)
5. Connect the negative battery cable.
6. Inspect for fuel leaks. Turn ON the ignition switch for 2 seconds. Turn OFF the ignition switch for 10 seconds. Again, turn the ignition switch to the ON position. Check for fuel leaks.

Removal Procedure (Forward Control)

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .
3. Disconnect the fuel feed pipe nuts at the fuel filter (1).
4. Remove the in-line fuel filter clamp attaching hardware (1).
5. Remove the clamp (2) from the inline fuel filter (1).

Installation Procedure (Forward Control)

1. Remove the protective caps from the new filter.
2. Install the clamp (2) to the Inline fuel filter (1). (Scheme 32)
3. Install the in-line filter clamp attaching hardware (1). see scheme 35
4. Install in the same positions as on the old filter noting direction of fuel flow arrow. Connect the fuel feed pipes to the filter and tighten (1). see scheme 34 Tighten Tighten the fuel line to fuel filter nuts to 25 N.m(18 lb ft).
5. Connect the negative battery cable.
6. Inspect for fuel leaks. Turn ON the ignition switch for 2 seconds. Turn OFF the ignition switch for 10 seconds. Again, turn the ignition switch to the ON position. Check for fuel leaks.

Removal Procedure (Sierra, Silverado)

Tool Required

J 34730-1A Fuel Pressure Gauge

Scheme 27

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .
3. Raise the vehicle.
4. Clean all the fuel filter connections and the surrounding areas before disconnecting the fuel pipes in order to avoid possible contamination of the fuel system.
5. Disconnect the threaded fittings (2) from the fuel filter.
6. Cap the fuel pipes in order to prevent possible fuel system contamination.
7. Slide the fuel filter from the bracket (1).
8. Inspect the fuel pipe O-rings for cuts, nicks, swelling, or distortion. Replace the O-rings if necessary.

Installation Procedure (Sierra, Silverado)

1. Slide the fuel filter into the bracket (1). (Scheme 33)
2. Remove the caps from the fuel pipes. NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
3. Connect the threaded fittings (2) to the fuel filter. Tighten Tighten the fuel filter fittings to 25 N.m (18 lb ft).
4. Lower the vehicle.
5. Tighten the fuel filler cap.
6. Connect the negative battery cable.
7. Inspect for fuel leaks. Turn ON the ignition switch for 2 seconds. Turn OFF the ignition switch for 10 seconds. Again, turn the ignition switch to the ON position. Check for fuel leaks.

Removal Procedure (5.0L and 5.7L)

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi)
3. Disconnect the fuel feed pipes at the filter (1).
4. Remove the in-line fuel filter clamp attaching hardware (2).
5. Remove the clamp from the filter.

Installation Procedure (5.0L and 5.7L)

1. Remove the protective caps from the new filter.
2. Install the clamp to the filter.
3. Install the in-line filter clamp attaching hardware (2).
4. Install in the same position as on the old filter noting direction of fuel flow arrow. (Scheme 34) Connect the fuel feed pipes to the filter and tighten (1). Tighten Tighten the fuel line nuts to 27Nm(20 lb ft).
5. Connect the negative battery cable.
6. Inspect for fuel leaks. Turn ON the ignition switch for 2 seconds. Turn OFF the ignition switch for 10 seconds. Again, turn the ignition switch to the ON position. Check for fuel leaks.

Removal Procedure (7.4L)

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .
3. Disconnect the fuel feed pipes at the filter.
4. Remove the in-line fuel filter clamp attaching hardware.
5. Remove the clamp from the filter.

Installation Procedure (7.4L)

1. Remove the protective caps from the new filter.
2. Install the clamp to the filter.
3. Install the in-line filter clamp attaching hardware. Install in the same positions as on the old filter noting direction of fuel flow arrow.
4. Connect the fuel feed pipes to the filter and tighten. Tighten Tighten the fuel line nuts to 27 Nm (20 lb ft).
5. Connect the negative battery cable.
6. Inspect for fuel leaks. Turn ON the ignition switch for 2 seconds. Turn OFF the ignition switch for 10 seconds. Again, turn the ignition switch to the ON position. Check for fuel leaks.

Removal Procedure (Tracker)

1. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) . CAUTION: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
2. Disconnect the negative battery cable. CAUTION: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.
3. Raise the vehicle on a hoist.
4. Disconnect the fuel inlet hose (2) from the fuel filter (1).
5. Disconnect the fuel outlet hose (4) from the fuel filter (1).
6. Remove the retaining bolt (3) from the fuel filter bracket.
7. Remove the fuel filter (1) and the bracket from the vehicle.
8. Loosen the fuel filter bracket bolt and remove the fuel filter from the bracket.

Installation Procedure (Tracker)

Note. Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

1. Install the fuel filter to the fuel filter bracket. Tighten Tighten the bracket bolt to 11 N.m (8 lb ft).
2. Install the fuel filter (1) and the bracket to the vehicle. see scheme 43
3. Secure the fuel filter bracket to the vehicle with the retaining bolt (3). Tighten Tighten the bracket retaining bolt to 11 N.m (8 lb ft).
4. Reconnect the fuel outlet hose (4) to the fuel filter (1).
5. Reconnect the fuel inlet hose (2) to the fuel filter.
6. Lower the vehicle.
7. Connect the negative battery cable.
8. Inspect for fuel leaks and repair as necessary.

THROTTLE BODY (CSI)

Removal & Installation (4.3L, 5.0L & 5.7L)

1. Disconnect negative battery cable. Remove engine cover (if equipped). Disconnect IAT sensor harness connector (as necessary). Remove air cleaner outlet duct. Disconnect IAC valve and TP sensor harness connectors from throttle body.
2. Disconnect accelerator and cruise control cables. Remove accelerator cable bracket bolts and bracket. Remove air cleaner adapter stud and throttle body retaining studs. Remove throttle body assembly from intake manifold. Remove flange gasket and discard.
3. Clean gasket surface on intake manifold and throttle body. Install NEW flange gasket. Install throttle body assembly. Install throttle body studs and tighten to 80 INCH lbs. (9 N.m). Install air cleaner adapter stud and tighten to 72 INCH lbs. (8 N.m). To complete installation, reverse removal procedure. Before starting vehicle, ensure throttle and cruise control linkage does not hold throttle open.

1. Drain cooling system. Disconnect negative battery cable. Remove air intake duct. Disconnect accelerator and cruise control cables. Disconnect vacuum hose from throttle body. Disconnect IAC valve and TP sensor harness connectors from throttle body.
2. Disconnect coolant hose from throttle body. Disconnect coolant hose from vapor vent pipe. Remove throttle body retaining nuts. Remove throttle body assembly from intake manifold. Remove flange gasket and discard.
3. Clean gasket surface on intake manifold and throttle body. Install NEW flange gasket. Install throttle body assembly. Install throttle body nuts and tighten to 89 INCH lbs. (10 N.m). To complete installation, reverse removal procedure.

THROTTLE BODY (SFI)

1. Disconnect negative battery cable. Relieve cooling system pressure and drain engine coolant so level is below throttle body. Remove intake air inlet duct and breather hose from throttle body. Disconnect IAC valve and TP sensor harness connectors from throttle body.
2. Disconnect lower and upper coolant lines from throttle body. Disconnect accelerator cable and A/T throttle cable from throttle lever and cable bracket. Remove throttle body retaining bolts and nuts. Remove throttle body assembly from intake manifold. Remove flange gasket and discard.
3. Clean gasket surface on intake manifold and throttle body. Install NEW flange gasket. Install throttle body assembly. Install throttle body bolts and nuts. Tighten throttle body bolts and nuts to 18 ft. lbs. (24 N.m). To complete installation, reverse removal procedure. After installing accelerator cable, ensure cable has correct free play. See appropriate ON-VEHICLE ADJUSTMENTS article.

Removal & Installation (2.2L)

1. Disconnect negative battery cable. Remove air cleaner resonator from throttle body. Disconnect IAC valve and TP sensor harness connectors from throttle body. Disconnect vacuum hose from throttle body.
2. Disconnect accelerator and cruise control cables from throttle body. Remove accelerator cable bracket. Remove throttle body retaining bolts. Remove throttle body from intake manifold. Remove flange gasket and discard.
3. Clean gasket surface on intake manifold and throttle body. Install NEW flange gasket. Install throttle body assembly. Install throttle body bolts and tighten to 89 INCH lbs. (10 N.m). To complete installation, reverse removal procedure.

Removal & Installation (3.4L)

1. Drain cooling system. Disconnect negative battery cable. Remove air cleaner intake tube from throttle body. Disconnect IAC valve and TP sensor harness connectors from throttle body. Disconnect coolant hoses from throttle body.
2. Remove heater pipe nut at throttle body. Disconnect accelerator control cable from throttle body. Remove accelerator cable bracket. Remove throttle body retaining bolts and nuts. Remove throttle body from intake manifold.
3. Clean gasket surface on intake manifold and throttle body. Install NEW flange gasket. Install throttle body assembly. Install throttle body bolts and nuts. Tighten throttle body bolts and nuts to 21 ft. lbs. (28 N.m). To complete installation, reverse removal procedure.

Removal & Installation (7.4L)

1. Disconnect negative battery cable. Remove air inlet duct fastener and duct. Disconnect IAC valve and TP sensor harness connectors from throttle body. Disconnect accelerator and cruise control cables.
2. Remove accelerator cable bracket bolts and bracket. Remove wiring harness fastener nut and throttle body retaining studs. Remove throttle body assembly. Remove flange gasket and discard.
3. Clean gasket surface on intake manifold and throttle body. Install NEW flange gasket. Install throttle body assembly. Install throttle body studs and wiring harness. Tighten throttle body studs to 18 ft. lbs. (24 N.m). To complete installation, reverse removal procedure. Before starting vehicle, ensure throttle and cruise control linkage does not hold throttle open.

1. Disconnect negative battery cable. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) . Disconnect harness connectors from fuel meter body. Disconnect fuel feed and return lines. Remove upper intake manifold assembly. See «UPPER INTAKE MANIFOLD ASSEMBLY (CSI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) .
2. Label injector lines for installation reference. Squeeze injector lock tabs and lift injectors from lower intake manifold. Remove fuel meter body from bracket with injector lines and injectors attached by releasing lock tabs on bracket. Disassemble as necessary.
3. To install, reverse removal procedure. Ensure all injectors are properly lock in place. Install NEW "O" ring on fuel feed and return lines. Tighten all nuts and bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) .

1. Relieve fuel system pressure. See «FUEL SYSTEM PRESSURE RELEASE (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) . Disconnect negative battery cable. Disconnect fuel injector electrical connector. Remove intake manifold hold-down bracket bolts and remove bracket.
2. Remove high pressure and return lines from fuel rail. Remove fuel lines hold-down bracket bolt. Remove 3 fuel rail retaining bolts and remove fuel rail. Remove injectors from fuel rail. Remove injector "O" rings and discard.

Installation (1.6L & 2.0L)

To install, reverse removal procedure. Coat NEW injector "O" rings with clean engine oil. Ensure injectors rotate smoothly and freely. If "O" rings is installed incorrectly, injectors will bind. Tighten fuel rail retaining bolts. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Removal (2.2L)

1. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) . Disconnect negative battery cable. Remove intake manifold assembly. See «INTAKE MANIFOLD ASSEMBLY»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) .
2. Disconnect fuel injector harness connectors. Disconnect fuel feed line at fuel rail. Disconnect fuel return line at pressure regulator. Remove fuel pressure regulator. Remove fuel rail retaining bolts. Remove fuel rail from cylinder head. Remove injectors from fuel rail. Remove injector "O" rings and discard.

Installation (2.2L)

To install, reverse removal procedure. Coat NEW injector "O" rings with clean engine oil. Ensure injectors rotate smoothly and freely. If "O" rings is installed incorrectly, injectors will bind. Tighten fuel rail retaining bolts. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Removal (3.4L)

1. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) . Disconnect negative battery cable. Remove upper intake manifold assembly. See «UPPER INTAKE MANIFOLD ASSEMBLY (SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) .
2. Disconnect fuel feed and return lines at fuel rail. Disconnect main injector harness connector. Disconnect coolant temperature sensor harness connector. Remove 2 fuel rail retaining bolts. Remove fuel rail from intake manifold. Remove injectors from fuel rail. Remove injector "O" rings and discard.

Installation (3.4L)

To install, reverse removal procedure. Coat NEW injector "O" rings with clean engine oil. Ensure injectors rotate smoothly and freely. If "O" rings is installed incorrectly, injectors will bind. Tighten fuel rail retaining bolts. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Removal (4.8L, 5.3L & 6.0L)

1. Disconnect negative battery cable. Remove engine sight shield. Remove engine sight shield bracket bolts and bracket. Disconnect accelerator and cruise control cables from cable bracket. Disconnect accelerator and cruise control cables from throttle body.
2. Remove upper engine wiring harness retainer nut. Disconnect EVAP purge solenoid harness connector. Reposition engine wiring harness aside. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .
3. Label injector lines for installation reference. Pull top portion of injector connector up being careful not to pull up past top of White portion. Push tab on lower side of injector connector to release connector. Disconnect fuel feed and return lines at fuel rail.
4. Disconnect fuel pressure regulator vacuum line. Loosen crossover tube to right fuel rail retainer screw. Remove fuel rail retaining bolts. Remove fuel rail from intake manifold. Remove injectors from fuel rail. Remove injector "O" rings and discard.

Installation (4.8L, 5.3L & 6.0L)

To install, reverse removal procedure. Coat NEW injector "O" rings with clean engine oil. Ensure injectors rotate smoothly and freely. If "O" rings is installed incorrectly, injectors will bind. Tighten fuel rail retaining bolts. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Removal (7.4L)

1. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) . Disconnect negative battery cable. Remove upper intake manifold assembly. See «UPPER INTAKE MANIFOLD ASSEMBLY (SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) .
2. Remove high voltage switch assembly. Disconnect fuel feed and return lines at fuel rail. Remove fuel line bracket bolt. Remove fuel feed and return line "O" rings and discard. Disconnect injector harness connectors and remove from coil bracket.
3. Remove fuel rail retaining bolts. Disconnect vacuum hose line to pressure regulator. Remove fuel rail from intake manifold. Remove injectors from fuel rail. Remove injector "O" rings and discard.

Installation (7.4L)

To install, reverse removal procedure. Coat NEW injector "O" rings with clean engine oil. Ensure injectors rotate smoothly and freely. If "O" rings is installed incorrectly, injectors will bind. Tighten fuel rail retaining bolts. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Disconnect IAC valve harness connector. Remove IAC valve retaining screws. Remove IAC valve and "O" ring from throttle body.

Note. Before installation, clean "O" ring sealing surface, pintle seat and air passage. If air passage has heavy deposits, remove throttle body for complete cleaning.

1. Inspect "O" ring for damage. Replace as necessary. If reusing IAC valve, DO NOT push or pull on pintle. Threads on worm gear will be damaged.
2. If replacing IAC valve, measure distance between tip of new IAC valve pintle and mounting flange. Distance should not exceed 1 1/8" (28 mm). If distance is more than specified, use finger pressure to slowly retract pintle. Lubricate "O" ring with clean engine oil.
3. Apply thread locking compound (Loctite 262) to IAC valve retaining screw threads. Install IAC valve to throttle body. Tighten IAC valve retaining screws to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) . Reconnect IAC valve harness connector.
4. To reset IAC valve pintle position, turn ignition on for 20 seconds. Turn ignition off for 10 seconds. Start engine and check for proper idle operation. Repeat procedure if proper idle operation is not obtained.

FUEL PUMP

Note. When installing fuel sending unit assembly, DO NOT fold or twist strainer. This will restrict fuel flow.

Note. 5.0L, 5.7L and 7.4L models are also equipped with a balance pump. Balance pump is located on right side frame rail.

Removal & Installation (V6 & V8 Models)

1. Fuel pump is located in fuel tank and is integral with fuel sending unit assembly. Fuel pump must be replaced with fuel sending unit as an assembly. Relieve fuel system pressure. See «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) . Disconnect negative battery cable.
2. Raise vehicle and support vehicle. Disconnect fuel lines and electrical connections at fuel tank. Remove fuel tank. Remove fuel sending unit assembly retaining ring or cam lock ring. Lift fuel sending unit assembly from fuel tank. To install, reverse removal procedure using NEW "O" ring and gasket.

Removal & Installation (4 Cyls - 1.6L & 2.0L)

1. Fuel pump is located in fuel tank and is integral with fuel sending unit assembly. Fuel pump must be replaced with fuel sending unit as an assembly. Relieve fuel system pressure. See «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) . Disconnect negative battery cable. Raise vehicle and remove fuel tank.
2. Disconnect fuel feed and return lines from fuel sending unit assembly. Disconnect fuel sending unit harness connector. Remove 6 fuel sending unit assembly retaining bolts. Remove fuel sending unit assembly and gasket from fuel tank.
3. To install, reverse removal procedure using NEW "O" ring and gasket. Tighten fuel sending unit assembly retaining bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) .

Removal Procedure

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .
3. Remove the upper manifold assembly. Refer to «INTAKE MANIFOLD (UPPER) REMOVAL (7.4L)»(ref-1456-S23598486662000031300000) in Engine Mechanical.

Scheme 28

1. Disassemble the fuel pressure regulator snap ring retainer.

Scheme 29

1. Disassemble the regulator assembly and the O-rings.
2. Discard the O-rings.

Assemble Procedure

1. Lubricate the new O-rings with clean engine oil.
2. Install the backup O-Ring, the large O-ring, the filter and the small O-ring.

1. Assemble the regulator with the vacuum tube pointing down into the snap ring retainer.

Installation Procedure

1. Install the upper manifold assembly. Refer to «INTAKE MANIFOLD (UPPER) INSTALLATION (7.4L)»(ref-1456-S41626112432000031300000) in Engine Mechanical.
2. Connect the negative battery cable.

Tool Required

J 34730-1A Fuel Pressure Gauge

Scheme 30

1. Disconnect the negative battery cable.
2. Remove the engine sight shield.
3. Relieve the fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .

Scheme 31

1. Disconnect the fuel pressure regulator vacuum line.
2. Clean any dirt from the fuel pressure regulator retainer and the surrounding area.
3. Remove the fuel pressure regulator retainer (8).
4. Remove the fuel pressure regulator (9) from the fuel pressure regulator housing.

1. Install the backup ring (10) on the fuel pressure regulator (9).
2. Install the new large O-Ring (11) on the fuel pressure regulator (9).
3. Install the regulator filter (12) on the fuel pressure regulator (9).
4. Install the new small O-ring (13) on the fuel pressure regulator (9).
5. Lubricate the fuel pressure regulator large O-ring (11) and the small O-ring (13) with clean engine oil.
6. Push the fuel pressure regulator into the regulator housing on the fuel rail.
7. Install a new fuel pressure regulator retainer (8).
8. Connect the fuel pressure regulator vacuum line.

1. Connect the negative battery cable.
2. Tighten the fuel filler cap.
3. Inspect for leaks. Turn the ignition switch ON for 2 seconds. Turn the ignition switch OFF for 10 seconds. Turn the ignition switch ON. Check for fuel leaks.
4. Install the engine sight shield.

1. Disconnect negative battery cable. Remove upper fan shroud. Disconnect vacuum brake booster hose. Remove air cleaner outlet resonator. Disconnect necessary harness connectors. Disconnect vacuum hoses from throttle body. Remove right fender wheelwell extension.
2. Remove necessary pipe bracket retainers from intake manifold. Disconnect fuel feed and return lines at fuel rail. Disconnect control cables from throttle body. Disconnect spark plug wires from spark plugs. Remove spark plug wiring harness retainer from heater hose pipe and position aside wiring harness.
3. Working through wheelwell, remove generator rear brace from engine. Remove engine wiring harness bracket at back of engine. Remove intake manifold assembly retaining bolts. Remove intake manifold assembly and gasket.

To install, reverse removal procedure. Tighten intake manifold assembly retaining bolts to specification using an alternating sequence. See TORQUE SPECIFICATIONS .

Removal (4.3L, 5.0L & 5.7L)

1. Disconnect negative battery cable. Remove air cleaner assembly. Remove EVAP canister purge solenoid. Disconnect necessary harness connectors. Disconnect necessary vacuum hoses. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__fuel-system-pressure-relief-csi) .
2. Disconnect control cables from throttle lever cam and bracket. Disconnect fuel feed and return lines from fuel meter body assembly. Disconnect power brake and crankcase ventilation valve vacuum hoses at upper manifold and valve cover. Remove distributor cap and position aside (if necessary). Remove upper intake manifold mounting studs. Remove upper intake manifold and gasket.

Installation (4.3L, 5.0L & 5.7L)

To install, reverse removal procedure. Tighten upper intake manifold assembly mounting studs to specification using an alternating sequence. See TORQUE SPECIFICATIONS .

1. Disconnect negative battery cable. Remove fuel injector sight shield. Drain cooling system. Disconnect necessary harness connectors. Remove air inlet duct from throttle body. Disconnect control cables from throttle body.
2. Disconnect left-bank spark plug wires from distributor and position aside. Disconnect coolant hose from throttle body. Remove EVAP canister solenoid valve. Remove ignition coil bracket with coils attached. Disconnect necessary vacuum hoses and remove vacuum harness.
3. Remove side and rear generator brackets. Remove EGR valve. Remove MAP sensor and bracket. Remove upper intake manifold retaining bolts. Remove upper intake manifold and gasket.

To install, reverse removal procedure. Tighten upper intake manifold assembly retaining bolts to specification using an alternating sequence. See TORQUE SPECIFICATIONS .

1. Disconnect negative battery cable. Remove air cleaner outlet duct from throttle body. Remove crankcase vent tube from throttle body. Remove PCV valve from valve cover. Remove EGR pipe from upper intake manifold. Remove ignition coil from intake manifold. Remove throttle body. See «THROTTLE BODY (SFI)»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks__throttle-body-sfi) .
2. Remove EVAP canister solenoid valve. Remove spark plug wire No. 8 from distributor cap. Remove upper intake manifold retaining bolts. Remove upper intake manifold and gasket.

To install, reverse removal procedure. Tighten upper intake manifold assembly retaining bolts to specification using an alternating sequence. See TORQUE SPECIFICATIONS .

1. Disconnect negative battery cable. Remove air cleaner assembly (if necessary). Disconnect Intake Air Temperature (IAT) sensor electrical connector and breather tube from air intake tube, and remove air intake tube from throttle body (if necessary).
2. On 4.8L, 5.3L and 6.0L, remove generator. On 7.4L, remove throttle body assembly. On all models, disconnect electrical connector from TP sensor. Remove TP sensor retaining screws. Remove TP sensor from throttle body.
3. With throttle valve in closed position, install TP sensor on throttle body. Ensure TP sensor lever engages with drive lever on throttle shaft. Install retaining screws and electrical connector. TP sensor is self-zeroing and is not adjustable.

OXYGEN SENSOR

Note. Oxygen sensor is mounted in exhaust pipe, below exhaust manifold and is equipped with a permanent pigtail which must remain intact when removing sensor.

1. Ensure oxygen sensor is free of contaminants. DO NOT use cleaning solvents of any type. Oxygen sensor may be difficult to remove when engine temperature is less than 120°F (48°C). Excessive removal force may damage threads in exhaust manifold or pipe.
2. Disconnect negative battery cable. Disconnect harness connector from oxygen sensor. Carefully remove oxygen sensor from exhaust pipe.

1. Whenever oxygen sensor is removed, coat threads with anti-seize compound before reinstallation. New oxygen sensors already have this compound applied to threads.
2. Install oxygen sensor in exhaust pipe. Tighten oxygen sensor to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) . Reconnect harness connector to oxygen sensor. Reconnect negative battery cable.

1. Disconnect negative battery cable. Remove air cleaner, noise cover and air inlet (if equipped). Remove fuel filler cap. Open air bleed valve on top of fuel manager/filter to release any pressure in fuel supply system. Remove fuel manager/filter. Remove generator rear bracket.
2. Remove EGR/boost solenoids with bracket from intake manifold studs (if equipped). Disconnect crankcase depression regulator hose at manifold. Disconnect EGR and PCV hoses (if equipped). Remove fuel line bracket and ground strap. Remove intake manifold bolts and fuel line clips. Remove intake manifold and gasket. Install Protective Covers (J-29664-1) in intake ports.
3. Remove injection line clips. Disconnect and cap injection lines at injector nozzles. Do not bend injection lines. Disconnect and cap injection lines at pump. Tag injection lines for reassembly reference. Cap all openings.

Remove caps and install injection lines. Ensure lines are properly positioned. see scheme 52 To complete installation, reverse removal procedure. Start engine and check for leaks.

Scheme 32

Fuel manager/filter is mounted on rear of intake manifold. Remove fuel filler cap. Open air bleed valve on top of fuel manager/filter to release any pressure in fuel supply system. Turn filter element nut counterclockwise and remove. Remove filter element by lifting straight out of filter housing. see scheme 53 It is not necessary to drain fuel from filter housing when changing filter element.

1. Ensure mating surface between filter element and filter housing is clean. Install NEW filter element by aligning widest key slot located under element assembly cap with widest key in filter housing assembly.
2. Tighten filter element nut by hand. Bleed air from fuel manager/filter. To bleed air, open air bleed valve on top of fuel manager/filter. Connect a hose to air bleed valve and place other end of hose in a container.
3. Remove ECM 1 fuse ("C", "G"and "K" Series) or FUEL SOL fuse ("P" Series). Crank engine for 10-15 seconds. Allow starter to cool down for one minute between cranking intervals. Repeat procedure until clear fuel is observed at air bleed hose.
4. Close air bleed valve. Install fuse or connect solenoid, and reinstall fuel filler cap. Start engine and allow to idle for 5 minutes. Check fuel manager/filter for leaks.

Scheme 33

Note. When installing fuel sending unit assembly, DO NOT fold or twist strainer. This will restrict fuel flow.

Note. Diesel models are also equipped with a lift pump. Lift pump is located on right side frame rail.

1. Fuel pump is located in fuel tank and is integral with fuel sending unit assembly. Fuel pump must be replaced with fuel sending unit as an assembly. Remove fuel filler cap. Disconnect negative battery cable. Drain fuel tank.
2. Raise vehicle and support vehicle. Disconnect fuel lines and electrical connections at fuel tank. Remove fuel tank. Using Cam Lock Remover (J-36608), turn cam lock counterclockwise. Lift fuel sending unit assembly from fuel tank. To install, reverse removal procedure using NEW "O"ring and gasket.

1. Disconnect negative battery cable. Remove intake manifold. Install Protective Covers (J-29664-1) in intake ports. Disconnect fuel injection lines. Disconnect fuel inlet line, harness connectors and hoses, and fuel return line at injection pump. Cap all openings.
2. Remove oil filler tube and grommet for oil filler tube. Remove injection pump timing gear cover. Scribe or paint alignment mark on front cover and injection pump flange. Manually rotate engine to position cylinder No. 1 at TDC on the compression stroke. Remove injection pump-to-drive gear retaining bolts. Remove injection pump mounting nuts. Remove injection pump and gasket. see scheme 54

1. Install NEW injection pump gasket. Align locating pin on injection pump hub with slot in injection pump driven gear. At the same time, align injection pump timing marks. Ensure cylinder No. 1 is set at TDC.
2. Attach injection pump to front cover. Ensure alignment marks made during removal are aligned. Tighten injection pump mounting nuts. Attach pump to drive gear and tighten bolts. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) . To complete installation, reverse removal procedure. Check injection pump timing. See appropriate ON-VEHICLE ADJUSTMENTS article.

Scheme 34

Disconnect negative battery cable. Disconnect fuel line clip. Remove fuel return line. Remove fuel injection line. Cap all openings. Using Injector Socket (J-29873), remove injector nozzle(s). Place socket on 1 3/16" (30 mm) hex flats of injector body to prevent damaging injector nozzle.

Remove caps from injector nozzles and fuel lines. Install injector nozzle(s). Install fuel injection line. Install fuel return line and fuel line clip. Reconnect negative battery cable. Start engine and check for leaks.

PURGING WATER FROM FUEL SYSTEM

1. Disconnect negative battery cable. Remove fuel filler cap. Place a hand operated pump into fuel filler neck and drain fuel from fuel tank. Reinstall fuel filler cap. Remove fuel tank and fuel sending unit assembly. Replace fuel tank if internally rusted. Replace fuel strainer (as necessary).
2. Remove fuel feed hose at fuel pump. Remove fuel return line at injection pump. Using low air pressure, blow out fuel lines toward rear of vehicle. Replace fuel lines if internally rusted. Remove ECM 1 fuse ("C", "G" and "K" Series) or FUEL SOL fuse ("P" Series). Remove fuel manager/filter element.
3. Install fuel sending unit assembly and fuel tank. Install fuel feed hose to fuel pump. Fill fuel tank with diesel fuel until tank is 1/4 full. Install fuel filler cap. Reconnect negative battery cable. Crank engine for 15 seconds. Allow starter to cool down for one minute between cranking intervals. Use a suitable container to collect fuel. Repeat procedure until clear fuel is pumped out.
4. Install NEW fuel filter element. Connect a hose from fuel injection pump return line to a closed metal container with a 2 gallon capacity. Crank engine for 15 seconds. Allow starter to cool down for one minute between cranking intervals. Repeat procedure until clear fuel is observed at fuel return line.
5. Install fuse. Crack open each injection line at each nozzle. Crank engine for 15 seconds. Allow starter to cool down for one minute between cranking intervals. Repeat procedure until clear fuel is observed at each nozzle. Install injection line to nozzle fitting and tighten to 18 ft. lbs. (24 N.m).
6. Start engine and idle for 15 minutes. Ensure fuel return line is in metal container and that container does not overflow. Turn ignition off. Remove hose from metal container. Install fuel return line to injection pump. Check for leaks.

WATER-IN-FUEL WARNING LIGHT

1. Fuel manager/filter should be drained every 5000 miles, or when WATER-IN-FUEL warning light comes on. Diesel fuel can damage asphalt and painted surfaces. Always place a drain pan under filter drain hose to collect fuel.
2. Stop vehicle and turn engine off. Apply parking brake. Open drain valve. Start and allow engine to idle for 2 minutes or until clear fuel is observed. Turn engine off and close drain valve.
3. If WATER-IN-FUEL warning light comes on after fuel manager/filter is purged of water, remove water-in-fuel sensor and wipe tip of sensor clean. Reinstall water-in-fuel sensor. If WATER-IN-FUEL warning light remains on, replace water-in-fuel sensor.

TURBOCHARGER

Note. Turbocharger overhaul information is not available from manufacturer. Replacement as a unit is recommended.

Removal (6.5L Diesel)

1. Disconnect negative battery cable. Remove engine cover. Raise and support vehicle. Remove right front wheel and inner splash shield for easier access to turbocharger and exhaust manifold. Remove air intake duct from between air cleaner and turbocharger. Remove Crankcase Depression Regulator (CDR) valve vent tube bracket on top of turbocharger.
2. Remove CDR valve and vent tube from air intake duct. Remove oil feed line at top of turbocharger. Remove outlet to intake duct rubber connector and loosen exhaust pipe-to-turbocharger exhaust outlet elbow clamp.
3. Remove vacuum hose to wastegate actuator. Remove oil drain tube from turbocharger. Remove turbocharger-to-exhaust manifold nuts. Remove turbocharger.

1. To install, reverse removal procedure. Ensure no foreign objects are present in intake and exhaust passages to turbocharger. Use a high temperature Anti-Seize Compound (GM 1052771) on all threaded fasteners. Fill oil feed hole at top of turbocharger with clean engine oil and manually rotate compressor wheel. This will prelube turbocharger shaft bearings.
2. Complete installation of components. Tighten retaining bolts and nuts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/removal-installation/#engine-controls-removal-installation-trucks) . Start engine and operate at low idle for 2 minutes. Check for oil leak at turbocharger fittings.

Disconnect negative battery cable. Remove turbocharger heat shield. Remove vacuum hose to wastegate actuator. Remove retaining pin or clip to wastegate actuator rod. Remove bolts securing wastegate actuator to turbocharger. Remove wastegate actuator from turbocharger. To install, reverse removal procedure.

TORQUE SPECIFICATIONS (GASOLINE)

TORQUE SPECIFICATIONS (GASOLINE)

TORQUE SPECIFICATIONS (DIESEL)

TORQUE SPECIFICATIONS (DIESEL)

See also:
• REMOVAL & INSTALLATION (TRACKER)
• MODEL IDENTIFICATION
• POWERTRAIN CONTROL MODULE (PCM)
• FUEL SYSTEM PRESSURE RELIEF (CSI & SFI)
• THROTTLE BODY (SFI)