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Engine Exhaust System Cadillac Escalade GMT900

Exhaust 5 illustrations ~6657 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Catalytic Converter to Exhaust Manifold Nut50 N.m37 lb ft
Engine Shield Bolt20 N.m15 lb ft
Exhaust Heat Shield Nut9 N.m80 lb in
Exhaust Manifold Bolt First Pass in Sequence Final Pass in Sequence15 N.m11 lb ft
20 N.m15 lb ft
Exhaust Muffler to Right Catalytic Converter Nut45 N.m33 lb ft
Exhaust Pipe Clamp at Left Catalytic Converter44 N.m32 lb ft
Exhaust Pipe Hanger Bracket Bolt25 N.m18 lb ft
Heated Oxygen Sensor (HO2S)42 N.m31 lb ft
Muffler to Catalytic Converter Nut (2-Bolt Flange) Muffler to Catalytic Converter Nut (Norma Clamp)45 N.m33 lb ft
28 N.m21 lb ft
Stabilizer Shaft Link to Frame Bolt/Nut65 N.m48 lb ft
Oil Level Indicator Tube Bolt25 N.m18 lb ft
Oil Pan Skid Plate Bolt28 N.m21 lb ft
Rear Axle Tie Rod Bolt/Nut (Left Side)105 N.m77 lb ft
Rear Shock Absorber Lower Bolt/Nut95 N.m70 lb ft
Steering Shaft Coupling Bolt/Nut50 N.m37 lb ft

Symptoms - Engine Exhaust

  1. Review the exhaust system description in order to familiarize yourself with the exhaust system components and the intended function of the components. Refer to «Exhaust System Description»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system__exhaust-system-description) .
  2. All diagnostics on a vehicle should follow a logical process. Strategy Based Diagnostics is a uniform approach for repairing all systems. The diagnostic flow is the place to start when repairs are necessary and may always be used in order to resolve a system problem. For a detailed explanation, refer to «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) .

Visual/Physical Inspection

  1. Inspect for aftermarket or non-OEM devices such as, but not limited to; tailpipe extensions, headers, and exhaust cutouts. Any aftermarket exhaust system devices could affect the operation and proper performance of the exhaust system.
  2. Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, engine temperature, engine load, and frequency of concern.
  3. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause any symptom.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system is operating as designed.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. Loss of power Refer to «Restricted Exhaust»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  2. Poor acceleration Refer to «Restricted Exhaust»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  3. Poor fuel economy Refer to «Restricted Exhaust»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  4. Excessive smoke diesel Refer to «Restricted Exhaust»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  5. Exhaust hissing noise Refer to «Exhaust Leakage»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system__exhaust-leakage)
  6. Exhaust popping noise Refer to «Exhaust Leakage»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system__exhaust-leakage)
  7. Exhaust rattle noise Refer to «Exhaust Noise»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system__exhaust-noise)
  8. Loud exhaust noise Refer to «Exhaust Noise»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system__exhaust-noise)
  9. Exhaust buzz, groan, hum noise Refer to «Exhaust Noise»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system__exhaust-noise)

Test Description

WARNINGWhile engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.

The numbers below refer to the step numbers in the diagnostic table.

  1. 3: The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust pressure is noticed on the J 35314-A Exhaust Back Pressure Gauge. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) .Removing the heater oxygen sensor (HO2S) may set a diagnostic trouble code (DTC). When finishing this diagnostic table, be sure to clear all codes.
  2. 4: This step will isolate the catalytic converter from the remainder of the exhaust system.
  3. 7: Confirming that the condition has been fixed is essential. If the symptom still exists and the vehicle has a dual exhaust system, proceed to Step 2 and repeat the diagnostic procedure on the opposite exhaust pipe.
StepActionValue(s)YesNo
1Did you verify the customers complaint?Go to Step 2
2Did you review the exhaust symptoms diagnostic information and perform the necessary inspections?Go to Step 3Go to Symptoms - Engine Exhaust
3Remove the heated oxygen sensor (HO2S) that is in front of and closest to the catalytic converter. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) . Install the J 35314-A Exhaust Back Pressure Gauge in place of the HO2S sensor. See Special Tools . Start the engine. Increase and monitor the engine speed at 2,000 RPM. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value?3.4 kPa (0.5 psi)Go to Step 4Go to Step 7
4Turn the engine OFF and place the ignition in the lock position. Remove the J 35314-A . See Special Tools . Re-install the HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) . Remove the post-catalyst HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) . Install the J 35314-A in place of the post HO2S sensor. See Special Tools . Start the engine. Increase and monitor the engine speed at 2,000 RPM. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value?3.4 kPa (0.5 psi)Go to Step 5Go to Step 6
5Inspect the exhaust system for the following conditions: Damage in the exhaust pipe Debris in the exhaust pipe Muffler internal failure Two-layer exhaust pipe separation Did you find and correct the condition?Go to Step 7
6Replace the catalytic converter. Refer to Catalytic Converter Replacement (with Exhaust Flange) or Catalytic Converter Replacement (with Exhaust Clamp) . Did you find and correct the condition?Go to Step 7
7Remove the J 35314-A . See Special Tools . Re-install the HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) . Clear any codes. Road test the vehicle in order to verify the repair. Did you correct the condition?System OKGo to Step 2

Exhaust Leakage

ProblemAction
WARNING: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system. DEFINITION: An exhaust leak may show stains at the area of the leak. The leak may be felt by holding a hand close to the suspected areas or using a smoke pencil. The leak may make a popping or hissing noise.Refer to Symptoms - Engine Exhaust prior to beginning this table.
Misaligned or improperly installed exhaust system components.Align and tighten the components to the specifications. Refer to Fastener Tightening Specifications . Ensure the exhaust hangers are in the proper locations and not loose.
Exhaust leaks at the following connections: Exhaust manifold to pipe Flanges Pipe clampsTighten the components to the specifications. Refer to Fastener Tightening Specifications .
Seals or gaskets leaking. Exhaust manifold to cylinder head Exhaust pipes to exhaust manifold Catalytic converter connection EGR connections, if equippedReplace the leaking seal or gasket. Refer to the affected components procedure for service.
Irregularities at the mating surfaces on the flange connections.Repair as required or replace the affected component. Refer to the affected components procedure for service.
Exhaust manifold cracked or broken.Replace the exhaust manifold. Refer to: Exhaust Manifold Replacement - Left Side Exhaust Manifold Replacement - Right Side .
Exhaust system component connection welds leaking.Replace the leaking component. Refer to the affected component's procedure for service.
Muffler damaged or leaking at the seams.Replace the affected muffler. Refer to Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76) or Exhaust Muffler Replacement (With L92) or Exhaust Muffler Replacement (With LFA) or Exhaust Muffler Replacement (With LMG, LY2 or LY5) .
WARNING
While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.

Exhaust Noise

ConditionAction
WARNING: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system. DEFINITION: An audible or physical noise due to a faulty component or damaged components causing a loose or misaligned exhaust system resulting in a rattle or vibration noise (buzz, groan, hum).Refer to Symptoms - Engine Exhaust prior to beginning this table.
Popping or hissing noiseExhaust leak. Refer to Exhaust Leakage .
Loud exhaustCompare to a known good vehicle. Inspect for a damaged or failed muffler or resonator. Replace the faulty muffler. Refer to Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76) or Exhaust Muffler Replacement (With L92) or Exhaust Muffler Replacement (With LFA) or Exhaust Muffler Replacement (With LMG, LY2 or LY5) .
External rattle or vibration noiseInspect for a bent or loose hanger, loose heat shield, or loose clamp. Inspect for a exhaust pipe causing interference. Repair or replace the affected component. Refer to the affected component's service procedure.
Internal rattleTest the components by tapping with a rubber mallet to confirm a rattle. Replace the faulty catalytic converter, or muffler. Refer to one of the following procedures: Catalytic Converter Replacement (with Exhaust Flange) Catalytic Converter Replacement (with Exhaust Clamp) Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76) Exhaust Muffler Replacement (With L92) Exhaust Muffler Replacement (With LFA) Exhaust Muffler Replacement (With LMG, LY2 or LY5)
WARNING
While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.

Special Tools

J 42640 Steering Column Anti-Rotation Pin

Removal Procedure

  1. Install the J 42640 into the steering column lower access hole.
  2. Remove the left wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Left Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__front-wheelhouse-liner-replacement-left) .
  3. Fully raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  4. Remove the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series similar).
  5. Lower the vehicle part way in order to work through the wheel opening.
  6. Remove the spark plug wires from the spark plugs. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the spark plug.
  7. Remove the spark plug wires from the ignition coils. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the ignition coil.
  8. Mark the relationship of the upper intermediate steering shaft to the steering column.
  9. Remove the steering shaft coupling bolt (2) and nut (1) from the upper intermediate steering shaft.
  10. Separate the upper intermediate steering shaft (3) from the steering column, position both shafts out of the way.
  11. Remove the exhaust manifold bolts, and exhaust manifold.
  12. Remove and discard the exhaust manifold gasket.
  13. Remove and discard the catalytic converter seal.
  14. If replacing the exhaust manifold, remove the exhaust manifold heat shield bolts, and shield from the exhaust manifold.

Installation Procedure

Note. Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostic (OBD) II system performance. The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material. Do not apply sealant to the first 3 threads of the bolt.

  1. If the exhaust manifold was replaced, position and install the exhaust manifold heat shield, and bolts to the exhaust manifold. Tighten: Tighten the bolts to 9 N.m (80 lb in).
  2. Clean the threads of the exhaust manifold bolts.
  3. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts.
  4. Install a NEW catalytic converter seal to the catalytic converter.
  5. Position the NEW exhaust manifold gasket and exhaust manifold to the cylinder head.
  6. Ensure that the exhaust manifold is seated to the catalytic converter.
  7. Install the exhaust manifold bolts. Tighten: Tighten the bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts. Tighten the bolts a final pass to 20 N.m (15 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
  8. Using a flat punch, bend the gasket tab at the rear of the gasket around the cylinder head edge.
  9. Position and align the marks on the upper intermediate steering shaft and the steering column.
  10. Install the upper intermediate steering shaft (3) to the steering column.
  11. Install the steering shaft coupling bolt (2) and nut (1) to the upper intermediate steering shaft. Tighten: Tighten the bolt/nut to 50 N.m (37 lb ft).
  12. Install the spark plug wires to the spark plugs.
  13. Install the spark plug wires to the ignition coils.
  14. Inspect the spark plug wires for proper installation. Push sideways on each boot in order to inspect the seating. Reinstall any loose boot.
  15. Fully raise and support the vehicle.
  16. Install the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series similar). Tighten: Tighten the nuts to 50 N.m (37 lb ft).
  17. Partially lower the vehicle.
  18. Install the left wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Left Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__front-wheelhouse-liner-replacement-left) .
  19. Remove the J 42640 from the steering column lower access hole.
  1. Remove the heated oxygen sensor (HO2S). Refer to «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) or «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) .
  2. Fully raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  3. Remove the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series similar).
  4. Remove the front wheel house liner - right side. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  5. Partially lower the vehicle in order to work through the wheel opening.
  6. Remove the spark plug wires (1) from the spark plugs. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the spark plug.
  7. Remove the spark plug wires from the ignition coils. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the ignition coil.
  8. Remove the oil level indicator tube from the engine block. Refer to «Oil Level Indicator Tube Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  9. Remove the exhaust manifold bolts and exhaust manifold.
  10. Remove and discard the exhaust manifold gasket.
  11. Remove and discard the exhaust manifold seal.
  12. If replacing the exhaust manifold, remove the exhaust manifold heat shield bolts, and shield from the exhaust manifold.

Note. Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance. The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material. Do not apply sealant to the first 3 threads of the bolt.

  1. If the exhaust manifold was replaced, position and install the exhaust manifold heat shield, and bolts to the exhaust manifold. Tighten: Tighten the bolts to 9 N.m (80 lb in).
  2. Clean the threads of the exhaust manifold bolts.
  3. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts.
  4. Install a NEW catalytic converter seal to the exhaust manifold.
  5. Position the NEW exhaust manifold gasket and exhaust manifold to the cylinder head.
  6. Ensure that the catalytic converter seal is seated to the catalytic converter.
  7. Install the exhaust manifold bolts. Tighten: Tighten the bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts. Tighten the bolts a final pass to 20 N.m (15 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
  8. Using a flat punch, bend the gasket tab at the rear of the gasket around the cylinder head edge.
  9. Install the oil level indicator tube to the engine block. Refer to «Oil Level Indicator Tube Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/mechanical/#engine-mechanical-53l-60l-62l-repair-instructions-on-vehicle) .
  10. Install the spark plug wires (1) to the spark plugs.
  11. Install the spark plug wires to the ignition coils.
  12. Inspect the spark plug wires for proper installation. Push sideways on each boot in order to inspect the seating. Reinstall any loose boot.
  13. Fully raise and support the vehicle.
  14. Install the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series similar). Tighten: Tighten the nuts to 50 N.m (37 lb ft).
  15. Partially lower the vehicle in order to work through the wheel opening.
  16. Install the front wheel house liner - right front. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  17. Install the HO2S. Refer to «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) or «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-53l-60l-62l-repair-instructions) .
  18. Inspect the exhaust system for leaks.
WARNINGRefer to Exhaust Service Warning .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the oil pan skid plate, if equipped. Refer to «Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Oil Pan Skid Plate Replacement (1500 with RPO NZZ)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  3. Remove heated oxygen (HO2S) (1, 2 and 3) and disconnect the heated oxygen (HO2S) sensors (4 and 5) harness connectors. For the L9H, LY2, or LY5 engines. Refer to «Heated Oxygen Sensor Replacement - Bank 1 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) and «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) . For the LFA engines. Refer to «Heated Oxygen Sensor Replacement - Bank 1 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) and «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions)
  4. Remove the catalytic converter pipe to the exhaust manifold nuts (1) and lower the converter.
  5. Remove the exhaust seals (2 and 3) and discard.
  1. Install NEW exhaust manifold seals (2 and 3).
  2. Install the catalytic converter pipe to the exhaust manifolds.
  3. Install the catalytic converter pipe to exhaust manifold nuts (1) and tighten to 50 N.m (37 lb ft).
  4. Install the transmission crossmember. Refer to «Transmission Support Crossmember Replacement (4WD 2500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (2WD 2500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (2WD 1500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (4WD 1500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  5. Inatall heated oxygen (HO2S) (1, 2 and 3) and connect the heated oxygen (HO2S) sensors (4 and 5) harness connectors. For the L9H, LY2, or LY5 engines. Refer to «Heated Oxygen Sensor Replacement - Bank 1 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) and «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) . For the LFA engines. Refer to «Heated Oxygen Sensor Replacement - Bank 1 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) and «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions)
  6. Install the transmission crossmember. Refer to «Transmission Support Crossmember Replacement (4WD 2500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (2WD 2500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (2WD 1500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (4WD 1500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  7. Install the oil pan skid plate if equipped. Refer to «Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Oil Pan Skid Plate Replacement (1500 with RPO NZZ)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  8. Lower the vehicle.
  9. Inspect for exhaust leaks.
WARNINGRefer to Exhaust Service Warning .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the oil pan skid plate, if equipped. Refer to «Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Oil Pan Skid Plate Replacement (1500 with RPO NZZ)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  3. Disconnect the heated oxygen (HO2S) sensors harness connectors. Refer to «Heated Oxygen Sensor Replacement - Bank 1 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) and «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  4. Remove the catalytic converter pipe to the exhaust manifold nuts (1).
  5. Remove the exhaust seals (2 and 3) and discard.
  1. Install NEW exhaust manifold seals (2 and 3).
  2. Install the catalytic converter pipe to the exhaust manifolds.
  3. Install the catalytic converter pipe to exhaust manifold nuts (1) and tighten to 50 N.m (37 lb ft).
  4. Install the transmission crossmember. Refer to «Transmission Support Crossmember Replacement (4WD 2500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (2WD 2500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (2WD 1500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Transmission Support Crossmember Replacement (4WD 1500 Series)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  5. Connect the heated oxygen (HO2S) sensors harness connectors. Refer to «Heated Oxygen Sensor Replacement - Bank 1 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) , «Heated Oxygen Sensor Replacement - Bank 2 Sensor 1»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) and «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/cadillac/escalade/gmt900-2006-2014/remont/testing-diagnostics/#engine-control-system-fuel-system-hybrid-hp2-60l-lz1-repair-instructions) .
  6. Install the oil pan skid plate if equipped. Refer to «Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Oil Pan Skid Plate Replacement (1500 with RPO NZZ)»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  7. Lower the vehicle.
  8. Inspect for exhaust leaks.

Scheme 1

Scheme 1: Catalytic Converter Replacement (with Exhaust Flange)
Scheme 1: Catalytic Converter Replacement (with Exhaust Flange)
CalloutComponent Name
Preliminary Procedure Remove the engine skid plate (if equipped). Refer to Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ) or Oil Pan Skid Plate Replacement (1500 with RPO NZZ) Remove the transmission support crossmember. Refer to Transmission Support Crossmember Replacement (4WD 2500 Series) or Transmission Support Crossmember Replacement (2WD 2500 Series) or Transmission Support Crossmember Replacement (2WD 1500 Series) or Transmission Support Crossmember Replacement (4WD 1500 Series) Disconnect the oxygen sensors. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) , Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) , Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) .
1Left Exhaust Manifold Nut (Qty: 3) WARNING: Refer to Exhaust Service Warning . WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 50 N.m (37 lb ft)
2Seal
3Right Exhaust Manifold Nut (Qty: 3) Tighten: 50 N.m (37 lb ft)
4Seal
5Exhaust Muffler Nut (Qty: 2) Tighten: 45 N.m (33 lb ft)
6Catalytic Converter
WARNING
Refer to Exhaust Service Warning .
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 2

Scheme 2: Catalytic Converter Replacement (with Exhaust Clamp)
Scheme 2: Catalytic Converter Replacement (with Exhaust Clamp)
CalloutComponent Name
Preliminary Procedure Remove the engine skid plate (if equipped). Refer to Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ) or Oil Pan Skid Plate Replacement (1500 with RPO NZZ) Remove the transmission support crossmember. Refer to Transmission Support Crossmember Replacement (4WD 2500 Series) or Transmission Support Crossmember Replacement (2WD 2500 Series) or Transmission Support Crossmember Replacement (2WD 1500 Series) or Transmission Support Crossmember Replacement (4WD 1500 Series) Disconnect the oxygen sensors. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 , Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 , Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
1Left Exhaust Manifold Nut (Qty: 3) WARNING: Refer to Exhaust Service Warning . WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 50 N.m (37 lb ft)
2Seal
3Right Exhaust Manifold Nut (Qty: 3) Tighten: 50 N.m (37 lb ft)
4Seal
5Exhaust Muffler Clamp Nut Tip: Replace the exhaust muffler clamp with a NEW clamp. Tighten: 28 N.m (21 lb ft)
6Catalytic Converter
WARNING
Refer to Exhaust Service Warning .
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

Scheme 3

Scheme 3: Three-Way Catalytic Converter Replacement
Scheme 3: Three-Way Catalytic Converter Replacement
CalloutComponent Name
Preliminary Procedure Remove the engine skid plate (if equipped). Refer to Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ) or Oil Pan Skid Plate Replacement (1500 with RPO NZZ) Remove the transmission support crossmember. Refer to Transmission Support Crossmember Replacement (4WD 2500 Series) or Transmission Support Crossmember Replacement (2WD 2500 Series) or Transmission Support Crossmember Replacement (2WD 1500 Series) or Transmission Support Crossmember Replacement (4WD 1500 Series) Disconnect the oxygen sensors. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) , Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) , Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) .
1Left Exhaust Manifold Nut (Qty: 3) WARNING: Refer to Exhaust Service Warning . WARNING: Refer to Hot Exhaust System Warning . CAUTION: Refer to Fastener Caution . Tighten: 50 N.m (37 lb ft)
2Seal
3Right Exhaust Manifold Nut (Qty: 3) Tighten: 50 N.m (37 lb ft)
4Seal
5Muffler Clamp Nut Tip: Replace the exhaust muffler clamp with a NEW clamp. Tighten: 22 N.m (17 lb ft)
WARNING
Refer to Exhaust Service Warning .
WARNING
Refer to Hot Exhaust System Warning .
CAUTION
Refer to Fastener Caution .

J 38185 Hose Clamp Pliers

WARNINGRefer to Exhaust Service Warning .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Disconnect the chassis wiring harness electrical connector (1) from the right rear wheel speed sensor wiring harness electrical connector (2).
  3. If the vehicle is equipped with regular production option (RPO) Z55, disconnect the chassis wiring harness electrical connector (3) from the right rear shock absorber.
  4. If the vehicle is equipped with RPO Z55, disconnect the right rear air line from the shock absorber.
  5. Remove the right rear wheel speed sensor wiring harness electrical connector clip from the frame.
  6. Remove the right rear wheel speed sensor wiring harness clips from the frame and the control arm bracket.
  7. Disconnect the right rear automatic level control sensor link rod from the sensor. Perform the following: Support the sensor lever with your hand. Twist the link rod ball in order to separate it from the ball stud.
  8. Install a suitable adjustable jack under the rear axle.
  9. Remove the right axle tie rod bolt (2) and nut (1).
  10. Remove the rear axle vent hose from the rear axle, if necessary.
  11. Remove the vent hose swivel clip from the rear brake crossover pipe, if necessary.
  12. Remove the right rear stabilizer shaft link to frame bolt and nut.
  13. Remove the right rear stabilizer shaft link from the frame.
  14. Remove the right rear shock absorber lower bolt and nut.
  15. Lower the right side of the rear axle using the adjustable jack in order to remove the muffler.
  16. Loosen the catalytic converter to muffler clamp bolt (1).
  17. Lubricate the insulators where the muffler assembly hangers are inserted in order to ease in removal.
  18. With the aid of an assistant, remove the insulators from the exhaust system hangers (1, 2, and 3).
  19. With the aid of an assistant, remove the insulator from the exhaust system hanger near the resonator.
  20. Remove the muffler assembly.
  1. Lubricate the insulators where the muffler assembly hangers are inserted for ease of installation.
  2. With the aid of an assistant, install the muffler assembly.
  3. With the aid of an assistant, install the insulators to the exhaust system hangers (1, 2, and 3).
  4. Install the insulator to the exhaust system hanger near the resonator.
  5. Position the muffler assembly to the three-way catalytic converter and tighten the norma clamp bolt to 28 N.m (21 lb ft)
  6. Raise the rear axle into position using the adjustable jack.
  7. Install the right rear shock absorber lower bolt and nut and tighten to 95 N.m (70 lb ft).
  8. Install the right rear stabilizer shaft link to the frame.
  9. Install the right rear stabilizer shaft link to frame bolt and nut and tighten to 65 N.m (48 lb ft).
  10. Install the right rear axle tie rod bolt (2) and nut (1).
  11. Install the rear axle vent hose to the rear axle, if necessary.
  12. Install the vent hose swivel clip to the rear brake crossover pipe, if necessary.
  13. Using the J 38185 install the right rear link rod to the ball studs on the sensors.
  14. Install the right rear wheel speed sensor wiring harness clips to the frame and the control arm bracket.
  15. Install the right rear wheel speed sensor wiring harness electrical connector clip to the frame.
  16. If the vehicle is equipped with RPO Z55, connect the right rear air line to the shock absorber.
  17. If the vehicle is equipped with RPO Z55, connect the chassis wiring harness electrical connector (3) to the right rear shock absorber.
  18. Connect the chassis wiring harness electrical connector (1) to the right rear wheel speed sensor wiring harness electrical connector (2).
  19. Lower the vehicle.

J 38185 Hose Clamp Pliers

WARNINGRefer to Exhaust Service Warning .
  1. Remove the right rear wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/cadillac/escalade/gmt900-2006-2014/remont/wheel-tire-system/#tires-wheels__tire-and-wheel-removal-and-installation) .
  2. Disconnect the chassis wiring harness electrical connector (1) from the right rear wheel speed sensor wiring harness electrical connector (2).
  3. If the vehicle is equipped with regular production option (RPO) Z55, disconnect the chassis wiring harness electrical connector (3) from the right rear shock absorber.
  4. If the vehicle is equipped with RPO Z55, disconnect the right rear air line from the shock absorber.
  5. Remove the right rear wheel speed sensor wiring harness electrical connector clip from the frame.
  6. Remove the right rear wheel speed sensor wiring harness clips from the frame and the control arm bracket.
  7. Disconnect the right rear automatic level control sensor link rod from the sensor. Perform the following: Support the sensor lever with your hand. Twist the link rod ball in order to separate it from the ball stud.
  8. Install a suitable adjustable jack under the rear axle.
  9. Remove the right axle tie rod bolt (2) and nut (1).
  10. Remove the rear axle vent hose from the rear axle, if necessary.
  11. Remove the vent hose swivel clip from the rear brake crossover pipe, if necessary.
  12. Remove the right rear stabilizer shaft link to frame bolt and nut.
  13. Remove the right rear stabilizer shaft link from the frame.
  14. Remove the right rear shock absorber lower bolt (4) and nut (3).
  15. Lower the right side of the rear axle using the adjustable jack in order to remove the muffler.
  16. Remove the muffler to catalytic converter nuts.
  17. Separate the hanger.
  18. If the vehicle is a Yukon Denali or Escalade perform the following steps, otherwise proceed to step 26.
  19. Lubricate the insulators where the muffler assembly hangers are inserted in order to ease in removal.
  20. With the aid of an assistant, remove the insulators from the exhaust system hangers (4, and 5).
  21. With the aid of an assistant, remove the insulator from the exhaust system hanger near the resonator.
  22. Remove the muffler assembly.
  23. If the vehicle is a Yukon XL, Yukon Denali XL, Escalade ESV, or Escalade EXT perform the following steps: Lubricate the insulators where the muffler assembly hangers are inserted in order to ease in removal. With the aid of an assistant, remove the insulators from the exhaust system hangers (3, 4, and 5).
  24. With the aid of an assistant, remove the insulator from the exhaust system hanger near the resonator.
  25. Remove the muffler assembly.
  1. If the vehicle is a Yukon XL, Yukon Denali XL, Escalade ESV, or Escalade EXT perform the following steps, otherwise proceed to step 6.
  2. Lubricate the insulators where the muffler assembly hangers are inserted for ease of installation.
  3. With the aid of an assistant, install the muffler assembly.
  4. With the aid of an assistant, install the insulators to the exhaust system hangers (3, 4, and 5).
  5. With the aid of an assistant, Install the insulator to the exhaust system hanger near the resonator.
  6. If the vehicle is a Yukon Denali or Escalade perform the following: Lubricate the insulators where the muffler assembly hangers are inserted for ease of installation. With the aid of an assistant, install the muffler assembly. With the aid of an assistant, install the insulators to the exhaust system hangers (2, and 3).
  7. Install the insulator to the exhaust system hanger near the resonator.
  8. Install the muffler to catalytic converter nuts and tighten to 45 N.m (33 lb ft).
  9. Install the insulator to the hanger.
  10. Raise the rear axle into position using the adjustable jack.
  11. Install the right rear shock absorber lower bolt and nut and tighten to 95 N.m (70 lb ft).
  12. Install the right rear stabilizer shaft link to the frame.
  13. Install the right rear stabilizer shaft link to frame bolt and nut and tighten to 65 N.m (48 lb ft).
  14. Install the right rear axle tie rod bolt (2) and nut (1) and tighten to 105 N.m (77 lb ft).
  15. Install the rear axle vent hose to the rear axle, if necessary.
  16. Install the vent hose swivel clip to the rear brake crossover pipe, if necessary.
  17. Using the J 38185 install the right rear link rod to the ball studs on the sensors.
  18. Install the right rear wheel speed sensor wiring harness clips to the frame and the control arm bracket.
  19. Install the right rear wheel speed sensor wiring harness electrical connector clip to the frame.
  20. If the vehicle is equipped with RPO Z55, connect the right rear air line to the shock absorber.
  21. If the vehicle is equipped with RPO Z55, connect the chassis wiring harness electrical connector (3) to the right rear shock absorber.
  22. Connect the chassis wiring harness electrical connector (1) to the right rear wheel speed sensor wiring harness electrical connector (2).
  23. Install the right rear wheel and tire. Refer to «Tire and Wheel Removal and Installation»(/cadillac/escalade/gmt900-2006-2014/remont/wheel-tire-system/#tires-wheels__tire-and-wheel-removal-and-installation) .
WARNINGRefer to Exhaust Service Warning .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Loosen the catalytic converter to muffler clamp bolt (1).
  3. Disconnect the muffler assembly from the resonator. Refer to «Exhaust Resonator Replacement (2-Mode)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  4. Lubricate the insulators where the muffler pipe hangers are inserted in order to ease in removal.
  5. Remove the insulators from the exhaust system hangers (1, 2, and 3).
  6. With the aid of an assistant, remove the muffler pipe assembly from the vehicle.
  1. Lubricate the insulators (1) where the muffler pipe hangers are inserted for ease of installation.
  2. With the aid of an assistant, install the muffler pipe assembly to the exhaust system hangers (1, 2, and 3).
  3. Connect the muffler assembly to the resonator. Refer to «Exhaust Resonator Replacement (2-Mode)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  4. Position the muffler assembly to the three-way catalytic converter norma clamp bolt (1) and tighten to 28 N.m (21 lb ft).
  5. Lower the vehicle.
  6. Inspect the exhaust system for leaks.

J 38185 Hose Clamp Pliers

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Disconnect the chassis wiring harness electrical connector (1) from the right rear wheel speed sensor wiring harness electrical connector (2).
  3. If the vehicle is equipped with regular production option (RPO) Z55, disconnect the chassis wiring harness electrical connector (3) from the right rear shock absorber.
  4. If the vehicle is equipped with RPO Z55, disconnect the right rear air line from the shock absorber.
  5. Remove the right rear wheel speed sensor wiring harness electrical connector clip from the frame.
  6. Remove the right rear wheel speed sensor wiring harness clips from the frame and the control arm bracket.
  7. Disconnect the right rear automatic level control sensor link rod from the sensor. Perform the following: Support the sensor lever with your hand. Twist the link rod ball in order to separate it from the ball stud.
  8. Install a suitable adjustable jack under the rear axle.
  9. Remove the right axle tie rod bolt (2) and nut (1).
  10. Remove the rear axle vent hose from the rear axle, if necessary.
  11. Remove the vent hose swivel clip from the rear brake crossover pipe, if necessary.
  12. Remove the right rear stabilizer shaft link to frame bolt and nut.
  13. Remove the right rear stabilizer shaft link from the frame.
  14. Remove the right rear shock absorber lower bolt and nut.
  15. Lower the right side of the rear axle using the adjustable jack in order to remove the muffler.
  16. Loosen the catalytic converter to muffler camp bolt (1).
  17. Lubricate the insulators where the muffler assembly hangers are inserted in order to ease in removal.
  18. With the aid of an assistant, remove the insulators from the exhaust system hangers (2 and 3).
  19. With the aid of an assistant, remove the insulator from the exhaust system hanger near the resonator.
  20. Remove the muffler assembly.
  1. Lubricate the insulators where the muffler assembly hangers are inserted for ease of installation.
  2. With the aid of an assistant, install the muffler assembly.
  3. With the aid of an assistant, install the insulators to the exhaust system hangers (2 and 3).
  4. Install the insulator to the exhaust system hanger near the resonator.
  5. Position the muffler assembly to the three-way catalytic converter and tighten the norma clamp bolt (1) to 28 N.m (21 lb ft).
  6. Raise the right side of the rear axle into position using the adjustable jack.
  7. Install the right rear shock absorber lower bolt and nut and tighten to 95 N.m (70 lb ft).
  8. Install the right rear stabilizer shaft link to the frame.
  9. Install the right rear stabilizer shaft link to frame bolt and nut and tighten to 65 N.m (48 lb ft).
  10. Install the right rear axle tie rod bolt (2) and nut (1) and tighten to 105 N.m (77 lb ft).
  11. Install the rear axle vent hose to the rear axle, if necessary.
  12. Install the vent hose swivel clip to the rear brake crossover pipe, if necessary.
  13. Using the J 38185 install the right rear link rod to the ball studs on the sensors.
  14. Install the right rear wheel speed sensor wiring harness clips to the frame and the control arm bracket.
  15. Install the right rear wheel speed sensor wiring harness electrical connector clip to the frame.
  16. If the vehicle is equipped with RPO Z55, connect the right rear air line to the shock absorber.
  17. If the vehicle is equipped with RPO Z55, connect the chassis wiring harness electrical connector (3) to the right rear shock absorber.
  18. Connect the chassis wiring harness electrical connector (1) to the right rear wheel speed sensor wiring harness electrical connector (2).
  19. Lower the vehicle.

Scheme 4

Scheme 4: Exhaust Resonator Replacement (2-Mode)
Scheme 4: Exhaust Resonator Replacement (2-Mode)
CalloutComponent Name
Preliminary Procedure: Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
1Clamp CAUTION: Refer to Fastener Caution . Tighten: 55 N.m (40 lb ft)
2Exhaust Resonator Procedure: Disengage the resonator from the insulators.
CAUTION
Refer to Fastener Caution .
WARNINGRefer to Exhaust Service Warning .

Note. Service the exhaust system insulators individually in order to retain the support for the exhaust system. Do not use oil base lubricants.

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger are inserted.
  3. Remove the exhaust system insulator (1, 2 or 3), or any additional insulators as required.
  1. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger will be inserted.
  2. Install the exhaust system insulator (1, 2 or 3) to the frame hanger, or any additional insulators as required.
  3. Lower the vehicle.
WARNINGRefer to Exhaust Service Warning .

Note. Service the exhaust system insulators individually in order to retain the support for the exhaust system. Do not use oil base lubricants.

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Spray lubricant onto the exhaust system insulators where the insulators are installed into the frame hangers for ease of removal.
  3. Remove the exhaust pipe insulators (1 and 2).
  4. If replacing the exhaust muffler insulators also (3 and 4), support the exhaust system with an adjustable jack to in order to retain exhaust positioning.
  5. Remove the exhaust system insulators (3 and 4) from the frame hangers.
  1. Spray lubricant onto the frame hangers where the insulators will be installed.
  2. Install the exhaust pipe insulators (1 and 2) to the frame hangers and the exhaust pipe.
  3. Install the exhaust muffler insulators (3 and 4) to the frame hangers and the muffler pipe and remove the adjustable jack stand.
  4. Inspect for proper positioning and clearance of the exhaust system.
WARNINGRefer to Exhaust Service Warning .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) . NOTE: Service the exhaust system insulators individually in order to retain the support for the exhaust system. Do not use oil base lubricants.
  2. Apply a soapy solution to the following in order to ease the removal of the hanger (1): The frame support bracket rod (2) The exhaust pipe hanger rod (3)
  3. Pry the exhaust pipe hanger (1) free from the following: The frame support bracket rod (2) The exhaust pipe hanger rod (3)
  1. Apply a soapy solution to the following in order to ease the installation of the hanger (1): The frame support bracket rod (2) The inner diameter of the exhaust pipe hanger (1) The exhaust pipe hanger rod (3)
  2. Press the exhaust pipe hanger (1) over the following: The frame support bracket rod (2) The exhaust pipe hanger rod (3)
  3. Lower the vehicle.
WARNINGRefer to Exhaust Service Warning .

Note. Service the exhaust system insulators individually in order to retain the support for the exhaust system. Do not use oil base lubricants.

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger are inserted.
  3. Remove the exhaust system insulator (1 or 3), as required.
  4. If replacing the exhaust system insulator (2 or 4), remove the exhaust muffler assembly. Refer to «Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LMG, LY2 or LY5)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) .
  5. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger is inserted.
  6. Remove the exhaust system insulator (2 or 4) from the frame hanger, as required.
  1. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger will be inserted.
  2. Install the exhaust system insulator (2 or 4) to the frame hanger, as required.
  3. If the exhaust system insulator (2 or 4) was replaced, install the exhaust muffler assembly. Refer to «Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LMG, LY2 or LY5)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) .
  4. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger will be inserted.
  5. Install the exhaust system insulator (1 or 3), as required.
  6. Lower the vehicle.
WARNINGRefer to Exhaust Service Warning .

Note. Service the exhaust system insulators individually in order to retain the support for the exhaust system. Do not use oil base lubricants.

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger are inserted.
  3. Remove the exhaust system insulator (1), as required.
  4. If replacing the exhaust system insulator (2), remove the exhaust muffler assembly. Refer to «Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With L92)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LFA)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LMG, LY2 or LY5)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) .
  5. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger is inserted.
  6. Remove the exhaust system insulator (2) from the frame hanger, as required.
  1. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger will be inserted.
  2. Install the exhaust system insulator (2) to the frame hanger, as required.
  3. If the exhaust system insulator (2) was replaced, install the exhaust muffler assembly. Refer to «Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With L92)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LFA)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LMG, LY2 or LY5)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) .
  4. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger will be inserted.
  5. Install the exhaust system insulator (1), as required.
  6. Lower the vehicle.
  1. Remove the catalytic converter, as required. Refer to one of the following: «Catalytic Converter Replacement (with Exhaust Flange)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Catalytic Converter Replacement (with Exhaust Clamp)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) «Three-Way Catalytic Converter Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  2. Remove the muffler assembly, as required. Refer to «Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With L92)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LFA)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LMG, LY2 or LY5)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) .
  3. Remove the left front floor panel exhaust heat shield nuts and heat shield, as required.
  4. If the vehicle is a Tahoe, Yukon, Yukon Denali, or a Escalade, remove the exhaust heat shield nuts and heat shields, as required.
  5. If the vehicle is a Suburban, Yukon XL, Yukon Denali XL, Escalade ESV, Escalade EXT or a Avalanche, remove the exhaust heat shield nuts and heat shields, as required.
  6. Remove the rear floor panel exhaust heat shield nuts and heat shield, as required
  1. Position the rear floor panel exhaust heat shield to the studs and install the heat shield nuts and tighten to 9 N.m (80 lb in).
  2. If the vehicle is a Suburban, Yukon XL, Yukon Denali XL, Escalade ESV, Escalade EXT or a Avalanche, position the exhaust heat shield to the studs and install the heat shield nuts, as required and tighten to 9 N.m (80 lb in).
  3. If the vehicle is a Tahoe, Yukon, Yukon Denali, or a Escalade, position the exhaust heat shield to the studs and install the heat shield nuts, as required and tighten to 9 N.m (80 lb in).
  4. Position the left front floor panel exhaust heat shield to the studs and install the heat shield nuts and tighten to 9 N.m (80 lb in).
  5. Install the muffler assembly, as required. Refer to «Exhaust Muffler Replacement (With LC9, LMG, LY5 or L76)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With L92)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LFA)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust Muffler Replacement (With LMG, LY2 or LY5)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) .
  6. Install the catalytic converter, if necessary. Refer to one of the following: «Catalytic Converter Replacement (with Exhaust Flange)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Catalytic Converter Replacement (with Exhaust Clamp)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) «Three-Way Catalytic Converter Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the engine shield bolts and shield, if necessary.
  3. For 1500 series vehicles, remove the oil pan skid plate bolts and skid plate, if equipped.
  4. For 2500 series vehicles, loosen the 2 rear oil pan skid plate bolts, remove the 2 front oil pan skid plate bolts and skid plate, if equipped.
  5. Remove the catalytic converter, if required. Refer to one of the following: «Catalytic Converter Replacement (with Exhaust Flange)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Catalytic Converter Replacement (with Exhaust Clamp)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) «Three-Way Catalytic Converter Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  6. Remove the dash panel exhaust heat shield nuts (2 or 4).
  7. Remove the dash panel exhaust heat shield (1 or 3) from the dash panel studs.
  1. Install the dash panel exhaust heat shield (1 or 3) to the dash panel studs.
  2. Install the dash panel exhaust heat shield nuts (2 or 4) and tighten to 9 N.m (80 lb in).
  3. Install the catalytic converter, if required. Refer to one of the following: «Catalytic Converter Replacement (with Exhaust Flange)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) or «Catalytic Converter Replacement (with Exhaust Clamp)»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system) «Three-Way Catalytic Converter Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/exhaust/#engine-exhaust-system)
  4. For 2500 series vehicles, position the oil pan skid plate and tighten until snug the 2 rear oil pan skid plate bolts. Install the 2 front oil pan skid plate bolts, if equipped and tighten the bolts to 28 N.m (21 lb ft)
  5. For 1500 series vehicles, position the oil pan skid plate and install the oil pan skid plate bolts, if equipped and tighten to 28 N.m (21 lb ft).
  6. Position the engine shield to the frame.
  7. Install and tighten the engine shield bolts and tighten to 20 N.m (15 lb ft).
  8. Lower the vehicle.
  1. Remove the right wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  2. Remove the exhaust manifold heat shield bolts and heat shield from the exhaust manifold.
  1. Position the exhaust manifold heat shield to the exhaust manifold and install the heat shield bolts and tighten to 9 N.m (80 lb in).
  2. Install the right wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  1. Remove the left wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Left Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__front-wheelhouse-liner-replacement-left) .
  2. Remove the exhaust manifold heat shield bolts and heat shield from the exhaust manifold.
  1. Position the exhaust manifold heat shield to the exhaust manifold and install the heat shield bolts and tighten to 9 N.m (80 lb in).
  2. Install the left wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Left Side»(/cadillac/escalade/gmt900-2006-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__front-wheelhouse-liner-replacement-left) .

Exhaust System Description

IMPORTANTUse of non-OEM parts may cause driveability concerns.

The exhaust system carries exhaust gases, treated by the catalytic converter, through the muffler and into a resonator, if applicable where exhaust noise is lessened.

In order to secure the exhaust muffler assembly to the exhaust manifold, a flange and seal-joint coupling is utilized. The exhaust system may utilize a slip-joint coupling design with a clamp and a U-bolt or a flange connection with a gasket.

Exhaust hangers and rubber insulators help to support the weight of the exhaust system along with insulating any exhaust system vibration, rattle, or noise.

Exhaust hangers also space the exhaust system away from the underbody of the vehicle and allows the exhaust system to expand as the exhaust system warms up.

Exhaust heat shields are used to protect the underbody and other components from damage due to the heat from the exhaust system.

The exhaust system may be comprised of the following components

  1. Catalytic converter
  2. Exhaust hanger
  3. Exhaust heat shield
  4. Exhaust insulator
  5. Exhaust manifold
  6. Exhaust muffler
  7. Exhaust pipe
  8. Exhaust resonator, if equipped
  9. Exhaust tail pipe, if equipped

Catalytic Converter

The catalytic converter is an emission control device added to the engine exhaust system in order to reduce hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) pollutants from the exhaust gas.

The catalytic converter is comprised of a ceramic monolith substrate, supported in insulation and housed within a sheet metal shell. The substrate may be washcoated with 3 noble metals

  1. Palladium (Pd)
  2. Platinum (Pt)
  3. Rhodium (Rh)

The catalyst in the converter is not serviceable.

Muffler

The exhaust muffler reduces the noise levels of the engine exhaust by the use of tuning tubes. The tuning tubes create channels inside the exhaust muffler that lower the sound levels created by the combustion of the engine.

Resonator

Some exhaust systems may be equipped with a resonator. The resonator, located either before or after the muffler, allows the use of mufflers with less back pressure. Resonators are used when vehicle characteristics require specific exhaust tuning.

Illustration Tool Number/ Description J 35314-A/BT-8515/BT-8515A Exhaust Back Pressure Tester J 38185 Hose Clamp Pliers J 44626 Oxygen Sensor Socket

Scheme 5

Scheme 5: Special Tools
Scheme 5: Special Tools