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Engine Exhaust System Cadillac CTS I

Exhaust 13 illustrations ~7277 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Bumper Nuts25 N.m18 lb ft
Catalytic Converter (to Exhaust Manifold) Nuts50 N.m37 lb ft
Drive Shaft Center Bearing Heat Shield Bolts8 N.m71 lb in
Exhaust Manifold Heat Shield Bolts (Except LS6)10 N.m89 lb in
Exhaust Manifold Heat Shield Bolts (LS6)9 N.m80 lb in
Exhaust Manifold (to Cylinder Head) Bolts (LH2)25 N.m18 lb ft
Exhaust Manifold (to Cylinder Head) Bolts (LY7)20 N.m15 lb ft
Exhaust Manifold (to Cylinder Head) Nuts (LH2)30 N.m22 lb ft
Exhaust Pipes (to Catalytic Converter) Nuts (LS6)30 N.m22 lb ft
Muffler Nuts (LY7)22 N.m16 lb ft
Muffler (Exhaust Pipe) to Exhaust Manifold Nuts (LH2)30 N.m22 lb ft
Tunnel Brace Bolts25 N.m18 lb ft

Fastener Tightening Specifications

Diagnostic Starting Point - Engine Exhaust

Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the information will help you determine the correct symptom diagnostic procedure when a malfunction exists. It will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Engine Exhaust in order to identify the correct procedure for diagnosing the system.

Symptoms - Engine Exhaust

  1. Review the Exhaust System Description and Operation in order to familiarize yourself with the system functions. Refer to «Exhaust System Description»(/cadillac/cts/i-2002-2007/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/cts/i-2002-2007/remont/hoistjack/#general-information__strategy-based-diagnosis) in General Information.

Visual/Physical Inspection

  1. Inspect for aftermarket or non-OEM devices such as, but not including; tailpipe extensions, headers, and exhaust cutouts. This 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/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) .
  2. Poor acceleration Refer to «Restricted Exhaust»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) .
  3. Poor fuel economy Refer to «Restricted Exhaust»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) .
  4. Excessive smoke-diesel Refer to «Restricted Exhaust»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) .
  5. Exhaust hissing noise Refer to «Exhaust Leakage»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-leakage) .
  6. Exhaust popping noise Refer to «Exhaust Leakage»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-leakage) .
  7. Exhaust rattle noise Refer to «Exhaust Noise»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-noise) .
  8. Loud exhaust noise Refer to «Exhaust Noise»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-noise) .
  9. Exhaust buzz, groan, hum noise Refer to «Exhaust Noise»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-noise) .

Diagnostic Aids

CAUTIONRefer to Hot Exhaust System Caution in Cautions and Notices.

For dual exhaust systems, a quick check of exhaust flow will help determine which side of the exhaust system is restricted. The side that has less exhaust flow is the side that will be suspect, and diagnosis should begin there.

Test Description

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

  1. 4: 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 Gage. Removing the HO2S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.
  2. 5: This step will isolate the catalytic converter from the remainder of the exhaust system.
  3. 8: 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 diagnostic procedure on the opposite exhaust pipe.
StepActionValue(s)YesNo
1Did you verify the customer complaint?Go to Step 2
2Did you review the exhaust symptom diagnostic information and perform the necessary inspections?Go to Step 3Go to Symptoms - Engine Exhaust
3Is the system equipped with dual exhaust?Go to Diagnostic AidsGo to Step 4
4Remove the heated oxygen sensor (HO2S) that is in front of the catalytic converter. Refer to the appropriate procedure. Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 in Engine Controls - 2.6L and 3.2L. Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 in Engine Controls - 3.6L (LY7). Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 in Engine Controls - 5.7L. Install the J 35314-A Exhaust Back Pressure Gage in place of the HO2S sensor. See Special Tools and Equipment . Start the engine. Increase and monitor the engine speed at 2,500 RPM. Observe the exhaust system back pressure reading on the gage. Does the reading exceed the specified value?9 kPa (1.25 psi)Go to Step 5Go to Step 8
5Turn the engine OFF and place the ignition in the lock position. Remove the J 35314-A . See Special Tools and Equipment . Re-install the HO2S sensor. Refer to the appropriate procedure. Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 in Engine Controls - 2.6L and 3.2L. Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 in Engine Controls - 3.6L (LY7). Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 in Engine Controls - 5.7L. Remove the post-catalyst HO2S sensor. Refer to the appropriate procedure. Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 in Engine Controls - 2.6L and 3.2L. Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 in Engine Controls - 3.6L (LY7). Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 in Engine Controls - 5.7L. Install the J 35314-A in place of the post HO2S sensor. See Special Tools and Equipment . Start the engine. Increase and monitor the engine speed at 2,500 RPM. Observe the exhaust system back pressure reading on the gage. Does the reading exceed the specified value?9 kPa (1.25 psi)Go to Step 6Go to Step 7
6Inspect the exhaust system for the following conditions: Damage in the exhaust pipe Debris in the exhaust pipe Muffler or resonator internal failure Two-layer exhaust pipe separation Did you find and correct the condition?Go to Step 8
7Replace the catalytic converter. Refer to Catalytic Converter Replacement - Left (LA3, LY9) , Catalytic Converter Replacement - Left (LY7) , Catalytic Converter Replacement - Left (LS6) or Catalytic Converter Replacement - Right (LA3, LY9) , Catalytic Converter Replacement - Right (LY7) or Catalytic Converter Replacement - Right (LS6) . Did you find and correct the condition?Go to Step 8
8Remove the J 35314-A . See Special Tools and Equipment . Reinstall the applicable HO2S sensor. Refer to the following: Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 in Engine Controls - 2.6L and 3.2L. Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 in Engine Controls - 3.6L (LY7). Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 in Engine Controls - 5.7L. Clear any codes. Road test the vehicle in order to verify the repair. Did you correct the condition?System OKGo to Step 2

Restricted Exhaust

Exhaust Leakage

ConditionAction
CAUTION: Refer to Hot Exhaust System Caution in Cautions and Notices. 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 componentsAlign and tighten the exhaust system components to the specifications. Refer to Fastener Tightening Specifications . Ensure the exhaust hangers are in the proper locations and not loose. Refer to Exhaust Hanger Replacement .
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 connectionReplace the leaking seal or gasket. Refer to the affected components procedure for service.
Irregularities at the mating surfaces on the flange connectionsRepair as required or replace the affected component. Refer to the affected components procedure for service.
Exhaust manifold cracked or brokenReplace the exhaust manifold. Refer to Exhaust Manifold Replacement - Left (LY7) , Exhaust Manifold Replacement - Left (LA3, LY9) , Exhaust Manifold Replacement - Left (LS6) or Exhaust Manifold Replacement - Right (LA3, LY9) , Exhaust Manifold Replacement - Right (LY7) or Exhaust Manifold Replacement - Right (LS6) .
Exhaust system component connection welds leakingReplace the leaking component. Refer to the affected component's procedure for service.
Muffler or resonator, if equipped, damaged or leaking at the seamsReplace the affected muffler or resonator, if equipped. Refer to Exhaust System Replacement (LA3, LY9) , Exhaust System Replacement (LY7) or Exhaust System Replacement (LS6) .
CAUTION
Refer to Hot Exhaust System Caution in Cautions and Notices.

Exhaust Leakage

Exhaust Noise

ConditionAction
CAUTION: Refer to Hot Exhaust System Caution in Cautions and Notices. 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, i.e. 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, if equipped. Replace the faulty muffler or resonator (if equipped). Refer to Exhaust System Replacement (LA3, LY9) , Exhaust System Replacement (LY7) or Exhaust System Replacement (LS6) .
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, resonator, if equipped, or muffler. Refer to Exhaust System Replacement (LA3, LY9) , Exhaust System Replacement (LY7) or Exhaust System Replacement (LS6)
CAUTION
Refer to Hot Exhaust System Caution in Cautions and Notices.

Exhaust Noise

Exhaust Manifold Replacement - Left (LY7)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.

Removal Procedure

  1. Remove the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) or «Exhaust Manifold Heat Shield Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) .
  2. Remove the oil level indicator. Refer to «Oil Level Indicator and Tube Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-36l-ly7-repair-procedures-1-of-5) in Engine Mechanical - 3.6L (LY7).
  3. Remove the catalytic converter nuts.
  4. Remove the exhaust manifold bolts.
  5. Remove the exhaust manifold and discard the exhaust manifold gasket.
  6. Clean and inspect the exhaust manifold. Refer to «Exhaust Manifold Cleaning and Inspection - Left»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-36l-ly7-repair-procedures-4-of-5) in Engine Mechanical - 3.6L.

Installation Procedure

  1. Install the catalytic converter seal/heat shield to the catalytic converter.
  2. Install a NEW exhaust manifold gasket to the exhaust manifold.
  3. Install the exhaust manifold with the gasket to the catalytic converter and the cylinder head.
  4. Install the exhaust manifold bolts. Tighten: Tighten the exhaust manifold bolts to 20 N.m (15 lb ft).
  5. Install the catalytic converter nuts. Tighten: Tighten the catalytic converter nuts to 50 N.m (37 lb ft).
  6. Install the oil level indicator. Refer to «Oil Level Indicator and Tube Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-36l-ly7-repair-procedures-1-of-5) in Engine Mechanical - 3.6L (LY7).
  7. Install the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) or «Exhaust Manifold Heat Shield Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) .

Exhaust Manifold Replacement - Left (LA3, LY9)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Remove the accessory mounting bracket. Refer to «Accessory Mounting Brackets Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-32l) in Engine Mechanical-2.6L and 3.2L.
  2. Disconnect the heated oxygen sensor pigtail (1) from the wiring harness connector (2).
  3. Remove the left catalytic converter. Refer to «Catalytic Converter Replacement - Left (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-la3) , «Catalytic Converter Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-ly7) or «Catalytic Converter Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-ls6) .
  4. Remove the heated oxygen sensor if replacement is necessary. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) in Engine Controls-2.6L and 3.2L.
  5. Remove the left exhaust manifold retaining nuts.
  6. Remove the left exhaust manifold and the gasket from the engine. Do not reuse the gasket.
  7. Clean and inspect the left exhaust manifold. Refer to «Exhaust Manifold Cleaning and Inspection»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-32l__exhaust-manifold-cleaning-and-inspection) in Engine Mechanical-2.6L and 3.2L.
  1. Place a NEW exhaust manifold gasket over the cylinder head studs.
  2. Position the left exhaust manifold to the left cylinder head.
  3. Install the left exhaust manifold nuts. Tighten: Tighten the exhaust manifold nuts to 20 N.m (15 lb ft).
  4. Install the heated oxygen sensor if previously removed. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) in Engine Controls-2.6L and 3.2L.
  5. Install the left catalytic converter. Refer to «Catalytic Converter Replacement - Left (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-la3) , «Catalytic Converter Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-ly7) or «Catalytic Converter Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-ls6) .
  6. Connect the heated oxygen sensor pigtail (1) to the wiring harness connector (2).
  7. Install the accessory mounting bracket. Refer to «Accessory Mounting Brackets Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-32l) in Engine Mechanical-2.6L and 3.2L.

Scheme 1

Scheme 1: Removal Procedure
Scheme 1: Removal Procedure
  1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
  2. Remove the left bank coil assembly. Refer to «Ignition Coil(s) Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  3. Remove the left bank spark plugs. Refer to «Spark Plug Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  4. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  5. Remove the left catalytic converter. Refer to «Catalytic Converter Replacement - Left (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-la3) , «Catalytic Converter Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-ly7) or «Catalytic Converter Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-ls6) .
  6. Disconnect the center steering shaft from the lower steering shaft. Separate the shafts and position aside to provide a removal envelope for the manifold. Refer to «Intermediate Steering Shaft Replacement - Center»(/cadillac/cts/i-2002-2007/remont/ignition-switchsteering-lock/#steering-wheel-steering-column) in Steering Wheel and Column.
  7. Lower the vehicle.
  8. Remove the exhaust manifold bolts.
  9. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  10. Remove the exhaust manifold, bolts, and gasket. Discard the gasket.
  11. Remove the heat shield from the manifold, if required.
  12. Clean and inspect the exhaust manifold. Refer to «Exhaust Manifold Cleaning and Inspection»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6__exhaust-manifold-cleaning-and-inspection) in Engine Mechanical - 5.7L.
IMPORTANTTighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may effect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance. The cylinder head exhaust manifold bolt hole threads must be cleaned and free of debris or threadlocking material.
  1. If necessary, install the exhaust manifold heat shield and bolts. Tighten: Tighten the exhaust manifold heat shield bolts to 9 N.m (80 lb in).
  2. Position the exhaust manifold and a NEW gasket into place.
  3. Lower the vehicle.
  4. Install the exhaust manifold bolts. Refer to «Exhaust Manifold Installation - Left»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6__exhaust-manifold-installation-left) in Engine Mechanical - 5.7L.
  5. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  6. Connect the center steering shaft to the lower steering shaft. Refer to «Intermediate Steering Shaft Replacement - Center»(/cadillac/cts/i-2002-2007/remont/ignition-switchsteering-lock/#steering-wheel-steering-column) in Steering Wheel and Column.
  7. Install the left catalytic converter. Refer to «Catalytic Converter Replacement - Left (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-la3) , «Catalytic Converter Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-ly7) or «Catalytic Converter Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-left-ls6) .
  8. Lower the vehicle.
  9. Install the left bank spark plugs. Refer to «Spark Plug Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  10. Install the left bank coil assembly. Refer to «Ignition Coil(s) Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  11. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

Exhaust Manifold Replacement - Right (LA3, LY9)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Remove the drive belt tensioner. Refer to «Drive Belt Tensioner Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-32l) in Engine Mechanical-2.6L and 3.2L.
  2. Disconnect the 2 cable harness clips (1) securing the engine wiring harness (4) to the ECM bracket (2) and position aside.
  3. Remove the 2 bolts (3) securing the after boil coolant pump to the ECM bracket, and position aside.
  4. Disconnect the heated oxygen sensor pigtail (2) from the wiring harness connector (1).
  5. Remove the following right exhaust manifold retaining nuts: The 3 upper The front lower
  6. Remove the starter. Refer to «Starter Motor Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) , «Starter Motor Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Motor Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  7. Remove the heated oxygen sensor if replacement is necessary. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) in Engine Controls-2.6L and 3.2L.
  8. Remove the remaining right exhaust manifold retaining nuts.
  9. Remove the right exhaust manifold and the gasket from the engine. Do not reuse the gasket.
  10. Clean and inspect the right exhaust manifold. Refer to «Exhaust Manifold Cleaning and Inspection»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-32l__exhaust-manifold-cleaning-and-inspection) in Engine Mechanical-2.6L and 3.2L.

Scheme 2

Scheme 2: Installation Procedure
Scheme 2: Installation Procedure
  1. Place a NEW exhaust manifold gasket over the cylinder head studs.
  2. Position the right exhaust manifold to the right cylinder head.
  3. Install the right exhaust manifold 3 lower nuts. Tighten: Tighten the exhaust manifold nuts to 20 N.m (15 lb ft).
  4. Install the heated oxygen sensor if previously removed. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) in Engine Controls-2.6L and 3.2L.
  5. Install the starter. Refer to «Starter Motor Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) , «Starter Motor Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Motor Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  6. Install the remaining right exhaust manifold nuts. Tighten: Tighten the exhaust manifold nuts to 20 N.m (15 lb ft).
  7. Connect the heated oxygen sensor pigtail (2) to the wiring harness connector (1).
  8. Install the 2 bolts (3) securing the after boil coolant pump to the ECM bracket. Tighten: Tighten the afterboil coolant pump bolts to 10 N.m (89 lb in).
  9. Connect the 2 cable harness clips (1) securing the engine wiring harness (4) to the ECM bracket (2).
  10. Install the drive belt tensioner. Refer to «Drive Belt Tensioner Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-32l) in Engine Mechanical-2.6L and 3.2L.

Exhaust Manifold Replacement - Right (LY7)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Remove the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) or «Exhaust Manifold Heat Shield Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) .
  2. Remove the catalytic converter nuts.
  3. Remove the exhaust manifold bolts.
  4. Remove the exhaust manifold and discard the exhaust manifold gasket.
  5. Clean and inspect the exhaust manifold. Refer to «Exhaust Manifold Cleaning and Inspection - Left»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-36l-ly7-repair-procedures-4-of-5) in Engine Mechanical - 3.6L.
  1. Install the catalytic converter seal/heat shield to the catalytic converter.
  2. Install a NEW exhaust manifold gasket to the exhaust manifold.
  3. Install the exhaust manifold with the gasket to the catalytic converter and the cylinder head.
  4. Install the exhaust manifold bolts. Tighten: Tighten the exhaust manifold bolts to 20 N.m (15 lb ft).
  5. Install the catalytic converter nuts. Tighten: Tighten the catalytic converter nuts to 50 N.m (37 lb ft).
  6. Install the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) or «Exhaust Manifold Heat Shield Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) .
  1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
  2. Remove the right bank coil assembly. Refer to «Ignition Coil(s) Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  3. Remove the right bank spark plugs. Refer to «Spark Plug Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  4. Remove the oil level dipstick tube. Refer to «Oil Level Indicator and Tube Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
  5. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  6. Remove the right catalytic converter. Refer to «Catalytic Converter Replacement - Right (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-la3) , «Catalytic Converter Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-ly7) or «Catalytic Converter Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-ls6) .
  7. Remove the starter motor. Refer to «Starter Motor Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) , «Starter Motor Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Motor Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  8. Lower the vehicle.
  9. Remove the exhaust manifold bolts.
  10. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  11. Remove the exhaust manifold, bolts, and gasket. Discard the gasket.
  12. Remove the heat shield from the manifold, if required.
  13. Clean and inspect the exhaust manifold. Refer to «Exhaust Manifold Cleaning and Inspection»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6__exhaust-manifold-cleaning-and-inspection) in Engine Mechanical - 5.7L.
IMPORTANTTighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may effect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance. The cylinder head exhaust manifold bolt hole threads must be cleaned and free of debris or threadlocking material.

Scheme 3

Scheme 3
Scheme 3
  1. If necessary, install the exhaust manifold heat shield and bolts. Tighten: Tighten the exhaust manifold heat shield bolts to 9 N.m (80 lb in). NOTE: Refer to «Fastener Notice»(/cadillac/cts/i-2002-2007/remont/oem-general-information/#cautions-and-notices__fastener-notice) in Cautions and Notices.
  2. Position the exhaust manifold and a NEW gasket into place.
  3. Lower the vehicle.
  4. Install the exhaust manifold bolts. Refer to «Exhaust Manifold Installation - Right»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6__exhaust-manifold-installation-right) in Engine Mechanical - 5.7L.
  5. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  6. Install the starter motor. Refer to «Starter Motor Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) , «Starter Motor Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Motor Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
  7. Install the right catalytic converter. Refer to «Catalytic Converter Replacement - Right (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-la3) , «Catalytic Converter Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-ly7) or «Catalytic Converter Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-ls6) .
  8. Lower the vehicle.
  9. Install the right bank spark plugs. Refer to «Spark Plug Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  10. Install the right bank coil assembly. Refer to «Ignition Coil(s) Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  11. Install the oil level dipstick tube. Refer to «Oil Level Indicator and Tube Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
  12. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

Exhaust System Replacement (LA3, LY9)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.

Servicing of the muffler, resonator or pipe requires the replacement of the exhaust system as a complete one-piece unit.

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the 2 bolts securing the floor panel tunnel brace to the floor panel.
  3. Remove the floor panel tunnel brace from the floor panel.
  4. Remove the nuts securing the exhaust pipe to the left catalytic converter.
  5. Remove the nuts securing the exhaust pipe to the right catalytic converter.
  6. Suitably support the exhaust system.
  7. Pry the front exhaust hanger (1) free from the rear suspension hanger rod.
  8. Apply a suitable lubricant to the tail pipe hanger rods in order to ease the removal of the tail pipe hangers (1).
  9. Pry the tail pipe hangers (1) free from the tail pipe hanger rods.
  10. With the aid of an assistant, lower the exhaust system.
  11. Remove the left side catalytic converter seal. Do not reuse the seal.
  12. Remove the right side catalytic converter gasket. Do not reuse the gasket.
  13. While the exhaust system is on the floor complete the following
  14. Apply a suitable lubricant to the exhaust pipe hanger rod (3) in order to ease the removal of the front exhaust hanger (2).
  15. Pull the front exhaust hanger (2) from the exhaust pipe hanger rod.

Scheme 4

Scheme 4: Installation Procedure
Scheme 4: Installation Procedure
  1. While the exhaust system is on the floor complete the following: Apply a soapy solution to the following in order to ease the installation of the hangers: The inner diameter of the front exhaust hanger (2) The exhaust pipe hanger rod (3) The inner diameter of the tail pipe hangers The tail pipe hanger rods (1) Press the front exhaust hanger (2) over the exhaust pipe hanger rod (3).
  2. Place a NEW seal on the left catalytic converter flange.
  3. Place a NEW gasket over the right catalytic converter studs.
  4. With the aid of an assistant, raise the exhaust system into position, aligning the exhaust pipe flanges with the studs located in the rear of the catalytic converters.
  5. Finger tighten the 4 nuts to the catalytic converter studs.
  6. Press the tail pipe hangers (1) over the tail pipe hanger rods.
  7. Press the front exhaust hanger (1) over the rear suspension hanger rod.
  8. Tighten the 2 left catalytic converter nuts previously installed in step 5. Tighten: Tighten the catalytic converter nuts to 15 N.m (11 lb ft).
  9. Tighten the 2 right catalytic converter nuts previously installed in step 5. Tighten: Tighten the catalytic converter nuts to 15 N.m (11 lb ft).
  10. Position the floor panel tunnel brace to the floor panel.
  11. Install the 2 bolts securing the floor panel tunnel brace to the floor panel. Tighten: Tighten the floor panel tunnel brace bolts to 25 N.m (18 lb ft).
  12. Lower the vehicle.
CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Disconnect the left and right bank #2 HO2S electrical connectors (bank 1 shown, bank 2 similar).
  3. Remove the HO2S wiring harnesses from the transmission case.
  4. Remove the muffler nuts and separate the exhaust system from the catalytic converters.
  5. Remove the muffler front hanger (1) from the muffler hanger rod.
  6. Pry the tail pipe hangers (1) from the muffler rods.
  7. Remove the floor panel tunnel brace bolts.
  8. Remove the floor panel tunnel brace from the floor panel.
  9. With the aid of an assistant, lower the exhaust system.
  10. Inspect and replace the exhaust system to catalytic converter seals if excessive wear or damage is noticed.
  11. Remove the muffler rear hangers (2) from the muffler(s).
  12. Remove the oxygen sensors (HO2S) from the exhaust system. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-36l-introduction) and «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-36l-introduction) in Engine Controls - 3.6L (LY7).
  1. Install the oxygen sensors (HO2S) to the exhaust system. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-36l-introduction) and «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-36l-introduction) in Engine Controls - 3.6L (LY7).
  2. Install the muffler rear hangers (2) to the muffler(s).
  3. With the aid of an assistant, raise the exhaust system into position.
  4. Install the exhaust system (muffler) nuts.
  5. Install the muffler (1) to the muffler rear hangers.
  6. Install the muffler rear hanger (1) to the hanger rod.
  7. Install the catalytic converter nuts. Tighten: Tighten the catalytic converter nuts to 15 N.m (11 lb ft).
  8. Install the floor panel tunnel brace to the floor panel.
  9. Install the floor panel tunnel brace bolts. Tighten: Tighten the floor panel tunnel brace bolts to 25 N.m (18 lb ft).
  10. Connect the left and right bank #2 HO2S electrical connectors (bank 1 shown, bank 2 similar).
  11. Install the HO2S wiring harnesses to the transmission case.
  12. Lower the vehicle.

Exhaust System Replacement (LS6)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.

Servicing of the muffler, resonator or pipe requires the replacement of the exhaust system as a complete one-piece unit.

Scheme 5

Scheme 5: Removal Procedure
Scheme 5: Removal Procedure

Scheme 6

Scheme 6
Scheme 6
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the 2 bolts securing the floor panel tunnel brace to the floor panel.
  3. Remove the floor panel tunnel brace from the floor panel.
  4. Suitably support the exhaust system.
  5. Remove the nuts securing the exhaust pipes to the catalytic converters.
  6. Pry the front exhaust hangers (1) free from the rear suspension hanger rods.
  7. Apply a suitable lubricant to the tail pipe hanger rods in order to ease the removal of the tail pipe hangers (1).
  8. Pry the tail pipe hangers (1) free from the tail pipe hanger rods.
  9. With the aid of an assistant, lower the exhaust system.
  10. Remove the catalytic converter seals. Do not reuse the seals.
  11. While the exhaust system is on the floor complete the following: Apply a suitable lubricant to the exhaust pipe hanger rods (3) in order to ease the removal of the front exhaust hangers (2). Pull the front exhaust hangers (2) from the exhaust pipe hanger rods.
  1. While the exhaust system is on the floor complete the following: Apply a soapy solution to the following in order to ease the installation of the hangers: The inner diameter of the front exhaust hangers (2) The exhaust pipe hanger rods (3) The inner diameter of the tail pipe hangers The tail pipe hanger rods (1) Press the front exhaust hangers (2) over the exhaust pipe hanger rods (3).
  2. Place NEW seals on the catalytic converter flanges.
  3. With the aid of an assistant, raise the exhaust system into position, aligning the exhaust pipe flanges with the studs located in the rear of the catalytic converters.
  4. Finger tighten the nuts to the catalytic converter studs.
  5. Press the tail pipe hangers (1) over the tail pipe hanger rods.
  6. Press the front exhaust hangers (1) over the rear suspension hanger rods.
  7. Tighten the exhaust pipes to catalytic converter nuts. Tighten: Tighten the catalytic converter nuts to 30 N.m (22 lb ft).
  8. Position the floor panel tunnel brace to the floor panel.
  9. Install the 2 bolts securing the floor panel tunnel brace to the floor panel. Tighten: Tighten the floor panel tunnel brace bolts to 25 N.m (18 lb ft).
  10. Lower the vehicle.

Catalytic Converter Replacement - Left (LA3, LY9)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Disconnect the Heated oxygen sensor at the sensor pigtail.
  3. Remove the heated oxygen sensor if replacement is necessary. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) in Engine Controls-2.6L and 3.2L.
  4. Remove the nuts securing the exhaust pipe to the left catalytic converter.
  5. Remove the nuts securing the exhaust pipe to the right catalytic converter.
  6. Position the exhaust system rearward, enough to allow the studs located in the rear of the catalytic converters to clear the exhaust pipe flange. Allow the exhaust system to rest on the floor panel tunnel brace.
  7. Remove the left side catalytic converter seal. Do not reuse the seal.
  8. Remove the right side catalytic converter gasket. Do not reuse the gasket.
  9. Remove the 2 nuts attaching the catalytic converter to the catalytic converter hanger bracket.
  10. Remove the 3 nuts attaching the catalytic converter to the exhaust manifold.
  11. Remove the catalytic converter and the seal. Do not reuse the seal.
  1. Insert a NEW seal into the seal grove of the catalytic converter.
  2. Position the catalytic converter to the exhaust manifold and catalytic converter hanger bracket.
  3. Install the 3 nuts attaching the catalytic converter to the exhaust manifold. Tighten: Tighten the exhaust manifold pipe nuts to 25 N.m (18 lb ft).
  4. Install the 2 nuts attaching the catalytic converter to the catalytic converter hanger bracket. Tighten: Tighten the catalytic converter hanger bracket nuts to 25 N.m (18 lb ft).
  5. Place a NEW seal on the left side catalytic converter flange.
  6. Place a NEW gasket over the right side catalytic converter studs.
  7. Align the exhaust pipe flanges with the studs located in the rear of the catalytic converters.
  8. Install the 2 nuts securing the exhaust pipe to the left catalytic converter. Tighten: Tighten the catalytic converter nuts to 15 N.m (11 lb ft).
  9. Install the 2 nuts securing the exhaust pipe to the right catalytic converter. Tighten: Tighten the catalytic converter nuts to 15 N.m (11 lb ft).
  10. Install the heated oxygen sensor if previously removed. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) in Engine Controls-2.6L and 3.2L.
  11. Connect the Heated oxygen sensor at the sensor pigtail.
  12. Lower the vehicle.

Catalytic Converter Replacement - Left (LY7)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Remove the left bank exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) or «Exhaust Manifold Heat Shield Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) .
  2. Remove the catalytic converter nuts.
  3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  4. Disconnect the oxygen sensor electrical connector.
  5. Disconnect the muffler pipe from the left and right side catalytic converters.
  6. Remove the exhaust pipe to right bank catalytic converter fasteners.
  7. Carefully remove the catalytic converter with the seal/heat shield and oxygen sensor from the exhaust manifold.
  8. Remove the oxygen sensor from the catalytic converter. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-36l-introduction) in Engine Controls - 3.6L (LY7).
  1. Install the oxygen sensor to the catalytic converter. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-36l-introduction) in Engine Controls - 3.6L (LY7).
  2. Install the catalytic converter seal/heat shield to the catalytic converter.
  3. Carefully install the catalytic converter to the exhaust manifold.
  4. Install the catalytic converter nuts.
  5. Connect the oxygen sensor electrical connector.
  6. Connect the muffler pipes to the left and right side catalytic converters. Tighten: Tighten the muffler nuts to 22 N.m (16 lb ft).
  7. Lower the vehicle.
  8. Tighten the catalytic converter to exhaust manifold fasteners. Tighten: Tighten the catalytic converter nuts to 50 N.m (37 lb ft).
  9. Install the right bank exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) or «Exhaust Manifold Heat Shield Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) .

Catalytic Converter Replacement - Left (LS6)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Support the exhaust with a suitable screw jack.
  3. Remove the floor panel tunnel brace. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) .
  4. Disconnect the exhaust system from the left and right side catalytic converters. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) or «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) .
  5. Using the screw jack, lower the exhaust system
  6. Disconnect the oxygen sensor electrical connectors.
  7. Remove the left bank catalytic converter to exhaust manifold nuts.
  8. Carefully remove the catalytic converter with the gasket (1) and oxygen sensors from the exhaust manifold.
  9. Remove the oxygen sensors from the catalytic converter. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  1. Install the oxygen sensors to the catalytic converter. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  2. Install the catalytic converter gasket (1) to the catalytic converter.
  3. Carefully install the catalytic converter to the exhaust manifold.
  4. Install the catalytic converter nuts.
  5. Tighten the catalytic converter to exhaust manifold nuts. Tighten: Tighten the catalytic converter nuts to 50 N.m (37 lb ft).
  6. Connect the oxygen sensor electrical connectors.
  7. Using the screw jack, raise the exhaust system.
  8. Connect the exhaust system to the left and right side catalytic converters. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) .
  9. Remove the screw jack.
  10. Install the floor panel tunnel brace. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) .
  11. Lower the vehicle.

Catalytic Converter Replacement - Right (LA3, LY9)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Disconnect the Heated oxygen sensor at the sensor pigtail.
  3. Remove the heated oxygen sensor if replacement is necessary. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) in Engine Controls-2.6L and 3.2L.
  4. Remove the nuts securing the exhaust pipe to the left catalytic converter.
  5. Remove the nuts securing the exhaust pipe to the right catalytic converter.
  6. Position the exhaust system rearward, enough to allow the studs located in the rear of the catalytic converters to clear the exhaust pipe flange. Allow the exhaust system to rest on the floor panel tunnel brace.
  7. Remove the left side catalytic converter seal. Do not reuse the seal.
  8. Remove the right side catalytic converter gasket. Do not reuse the gasket.
  9. Remove the 2 nuts attaching the catalytic converter to the catalytic converter hanger bracket.
  10. Remove the 3 nuts attaching the catalytic converter to the exhaust manifold.
  11. Remove the catalytic converter and the seal. Do not reuse the seal.
  1. Insert a NEW seal into the seal grove of the catalytic converter.
  2. Position the catalytic converter to the exhaust manifold and catalytic converter hanger bracket.
  3. Install the 3 nuts attaching the catalytic converter to the exhaust manifold. Tighten: Tighten the exhaust manifold pipe nuts to 25 N.m (18 lb ft).
  4. Install the 2 nuts attaching the catalytic converter to the catalytic converter hanger bracket. Tighten: Tighten the catalytic converter hanger bracket nuts to 25 N.m (18 lb ft).
  5. Place a NEW seal on the left side catalytic converter flange.
  6. Place a NEW gasket over the right side catalytic converter studs.
  7. Align the exhaust pipe flanges with the studs located in the rear of the catalytic converters.
  8. Install the 2 nuts securing the exhaust pipe to the left catalytic converter. Tighten: Tighten the catalytic converter nuts to 15 N.m (11 lb ft).
  9. Install the 2 nuts securing the exhaust pipe to the right catalytic converter. Tighten: Tighten the catalytic converter nuts to 15 N.m (11 lb ft).
  10. Install the heated oxygen sensor if previously removed. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) in Engine Controls-2.6L and 3.2L.
  11. Connect the Heated oxygen sensor at the sensor pigtail.
  12. Lower the vehicle.

Catalytic Converter Replacement - Right (LY7)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Remove the right bank exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) or «Exhaust Manifold Heat Shield Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) .
  2. Remove the catalytic converter nuts.
  3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  4. Disconnect the oxygen sensor electrical connector.
  5. Disconnect the muffler pipe from the left and right side catalytic converters.
  6. Remove the exhaust pipe to right bank catalytic converter fasteners.
  7. Carefully remove the catalytic converter with the seal/heat shield and oxygen sensor from the exhaust manifold.
  8. Remove the oxygen sensor from the catalytic converter. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-36l-introduction) in Engine Controls - 3.6L (LY7).
  1. Install the oxygen sensor to the catalytic converter. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-36l-introduction) in Engine Controls - 3.6L (LY7).
  2. Install the catalytic converter seal/heat shield to the catalytic converter.
  3. Carefully install the catalytic converter to the exhaust manifold.
  4. Install the catalytic converter to exhaust manifold fasteners.
  5. Connect the oxygen sensor electrical connector.
  6. Connect the muffler pipes to the left and right side catalytic converters. Tighten: Tighten the muffler nuts to 22 N.m (16 lb ft).
  7. Lower the vehicle.
  8. Tighten the catalytic converter nuts. Tighten: Tighten the catalytic converter nuts to 50 N.m (37 lb ft).
  9. Install the right bank exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) or «Exhaust Manifold Heat Shield Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-heat-shield-replacement) .

Catalytic Converter Replacement - Right (LS6)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Support the exhaust with a suitable screw jack.
  3. Remove the floor panel tunnel brace. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) .
  4. Disconnect the exhaust system from the left and right side catalytic converters. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) .
  5. Using the screw jack, lower the exhaust system
  6. Disconnect the oxygen sensor electrical connectors.
  7. Remove the right bank catalytic converter to exhaust manifold nuts.
  8. Carefully remove the catalytic converter with the gasket (1) and oxygen sensors from the exhaust manifold.
  9. Remove the oxygen sensors from the catalytic converter. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  1. Install the oxygen sensors to the catalytic converter. Refer to «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in Engine Controls - 5.7L.
  2. Install the catalytic converter gasket (1) to the catalytic converter.
  3. Carefully install the catalytic converter to the exhaust manifold.
  4. Install the catalytic converter nuts.
  5. Tighten the catalytic converter to exhaust manifold nuts. Tighten: Tighten the catalytic converter nuts to 50 N.m (37 lb ft).
  6. Connect the oxygen sensor electrical connectors.
  7. Using the screw jack, raise the exhaust system.
  8. Connect the exhaust system to the left and right side catalytic converters. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) .
  9. Remove the screw jack.
  10. Install the floor panel tunnel brace. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) .
  11. Lower the vehicle.

Exhaust Hanger Replacement

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.

Service the exhaust hangers individually in order to retain the support of the exhaust system.

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Pry the front exhaust hanger (1) free from the rear suspension hanger rod (2).
  3. Apply a suitable lubricant to the exhaust pipe hanger rod (3) in order to ease the removal of the hanger (1).
  4. Pry the front exhaust hanger (1) free from the exhaust pipe hanger rod (3).
  5. Apply a suitable lubricant to the following in order to ease the removal of the hanger (2): The body support bracket rod (1) The tail pipe hanger rod (3)
  6. Pry the tail pipe hanger (2) free from the tail pipe hanger rod (3).
  7. Pry the tail pipe hanger (2) free from the body support bracket rod (1).
  1. Apply a soapy solution to the following in order to ease the installation of the hanger: The body support bracket rod (1) The inner diameter of the tail pipe hanger (2) The tail pipe hanger rod (3)
  2. Press the tail pipe hanger (2) over the tail pipe hanger rod (3).
  3. Press the tail pipe hanger (2) over the body support bracket rod (1).
  4. Apply a soapy solution to the exhaust pipe hanger rod (3) and the inner diameter of the front exhaust hanger (1) in order to ease the installation of the hanger (1).
  5. Press the front exhaust hanger (1) over the exhaust pipe hanger rod (3).
  6. Press the front exhaust hanger (1) over the rear suspension hanger rod (2).
  7. Lower the vehicle.

Exhaust Hanger Mounting Bracket Replacement

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Apply a suitable lubricant to the following in order to ease the removal of the hangers (2): The exhaust hanger mounting bracket rods (1) The tail pipe hanger rods (3)
  3. Pry the tail pipe hangers (2) free from the tail pipe hanger rods (3).
  4. Pry the tail pipe hangers (2) free from the exhaust hanger mounting bracket rods (1).
  5. Remove the nuts securing the rear energy absorber and the exhaust hanger mounting bracket (2) to the rear compartment rail.
  6. Remove the stud plate (1) from the rear energy absorber.
  7. Remove the exhaust hanger mounting bracket from the rear energy absorber.

Scheme 7

Scheme 7: Installation Procedure
Scheme 7: Installation Procedure
  1. Position the exhaust hanger mounting bracket (2) between the rear energy absorber and the stud plate (1).
  2. Install the bumper nuts securing the rear energy absorber and the exhaust hanger mounting bracket (2) to the rear compartment rail. Tighten: Tighten the bumper nuts to 25 N.m (18 lb ft).
  3. Apply a soapy solution to the following in order to ease the installation of the hangers: The exhaust hanger mounting bracket rods (1) The inner diameter of the tail pipe hangers (2) The tail pipe hanger rods (3)
  4. Press the tail pipe hangers (2) over the tail pipe hanger rods (3).
  5. Press the tail pipe hangers (2) over the exhaust hanger mounting bracket rods (1).
  6. Lower the vehicle.
CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Disconnect the oxygen sensor retainers from the catalytic converter hanger bracket.
  3. Remove the nuts securing the catalytic converters to the catalytic converter hanger bracket.
  4. Remove the bolts securing the catalytic converter hanger bracket to the transmission.
  5. Bend the catalytic converter braces slightly rearward, only enough to clear the hanger bracket studs.
  6. Remove the catalytic converter hanger bracket from the catalytic converters.

Scheme 8

Scheme 8: Installation Procedure
Scheme 8: Installation Procedure
  1. Insert the catalytic converter hanger bracket studs through the catalytic converter braces.
  2. Install the bolts securing the catalytic converter hanger bracket to the transmission. Tighten: Tighten the catalytic converter hanger bracket bolts to 50 N.m (37 lb ft).
  3. Install the nuts securing the catalytic converters to the catalytic converter hanger bracket. Tighten: Tighten the catalytic converter hanger bracket nuts to 25 N.m (18 lb ft).
  4. Snap the oxygen sensor retainers into place in the catalytic converter hanger bracket.
  5. Lower the vehicle.

Exhaust Manifold Heat Shield Replacement - Right (LY7)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Remove the exhaust manifold heat shield bolts.
  2. Remove the exhaust manifold heat shield.
  1. Install the exhaust manifold heat shield.
  2. Install the exhaust manifold heat shield bolts. Tighten: Tighten the exhaust manifold heat shield bolt to 10 N.m (89 lb in).

Exhaust Manifold Heat Shield Replacement - Right (LS6)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Remove the right exhaust manifold. Refer to «Exhaust Manifold Replacement - Right (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-replacement-right-la3) , «Exhaust Manifold Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-replacement-right-ly7) or «Exhaust Manifold Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) .
  2. Remove the bolts (603) securing the exhaust manifold heat shield to the exhaust manifold.
  3. Remove the heat shield from the manifold.

Scheme 9

Scheme 9: Installation Procedure
Scheme 9: Installation Procedure
  1. Install the exhaust manifold heat shield to the manifold.
  2. Install the bolts (603) securing the exhaust manifold heat shield to the manifold. Tighten: Tighten the exhaust manifold heat shield bolts to 10 N.m (89 lb in).
  3. Install the right exhaust manifold. Refer to «Exhaust Manifold Replacement - Right (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-replacement-right-la3) , «Exhaust Manifold Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-replacement-right-ly7) or «Exhaust Manifold Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) .

Exhaust Manifold Heat Shield Replacement - Left (LS6)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Remove the left exhaust manifold. Refer to «Exhaust Manifold Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-replacement-left-ly7) , «Exhaust Manifold Replacement - Left (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-replacement-left-la3) or «Exhaust Manifold Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) .
  2. Remove the bolts (603) securing the exhaust manifold heat shield to the exhaust manifold.
  3. Remove the heat shield from the manifold.

Scheme 10

Scheme 10: Installation Procedure
Scheme 10: Installation Procedure
  1. Install the exhaust manifold heat shield to the manifold.
  2. Install the bolts (603) securing the exhaust manifold heat shield to the manifold. Tighten: Tighten the exhaust manifold heat shield bolts to 10 N.m (89 lb in).
  3. Install the left exhaust manifold. Refer to «Exhaust Manifold Replacement - Left (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-replacement-left-ly7) , «Exhaust Manifold Replacement - Left (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-manifold-replacement-left-la3) or «Exhaust Manifold Replacement - Left (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) .

Exhaust Manifold Heat Shield Replacement - Left (LY7)

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.

Tools Required

J 42640 Steering Column Anti-rotation Pin

  1. Install the J 42640 to the steering column. Refer to «Intermediate Steering Shaft Replacement - Lower»(/cadillac/cts/i-2002-2007/remont/ignition-switchsteering-lock/#steering-wheel-steering-column) in Steering Wheel and Column for the tool installation instructions.
  2. Remove the upper exhaust manifold heat shield bolts.
  3. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  4. Remove the lower exhaust manifold heat shield bolt.
  5. Disconnect the center intermediate shaft from the lower intermediate shaft to provide a removal envelope for the shield. Refer to «Intermediate Steering Shaft Replacement - Lower»(/cadillac/cts/i-2002-2007/remont/ignition-switchsteering-lock/#steering-wheel-steering-column) in Steering Wheel and Column.
  6. Remove the exhaust manifold heat shield.

Scheme 11

Scheme 11: Installation Procedure
Scheme 11: Installation Procedure
  1. Install the exhaust manifold heat shield.
  2. Install but do not tighten the lower heat shield bolt.
  3. Lower the vehicle.
  4. Install the upper exhaust manifold heat shield bolts. Tighten: Tighten the exhaust manifold heat shield bolts to 10 N.m (89 lb in).
  5. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  6. Tighten the lower exhaust manifold heat shield bolt. Tighten: Tighten the exhaust manifold heat shield bolt to 10 N.m (89 lb in).
  7. Install the center intermediate shaft to the lower intermediate shaft. Refer to «Intermediate Steering Shaft Replacement - Lower»(/cadillac/cts/i-2002-2007/remont/ignition-switchsteering-lock/#steering-wheel-steering-column) in Steering Wheel and Column.
  8. Lower the vehicle.
  9. Remove the J 42640 .

Exhaust Heat Shield Replacement - Center Bearing

CAUTIONRefer to Exhaust Service Caution in Cautions and Notices.
CAUTIONRefer to Protective Goggles and Glove Caution in Cautions and Notices.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
  2. Remove the bolts securing the center bearing heat shield to the center bearing.
  3. Remove the heat shield from the center bearing in the following order: Tilt the heat shield to either side. Slide the heat shield out from between the body, the drive shaft center bearing, and the exhaust pipes. Remove the heat shield from the vehicle.
  1. Install the center bearing heat shield to the center bearing in the following order: Slide the heat shield in between the body, the drive shaft center bearing, and the resonator. Align the holes in the heat shield with the holes in the center bearing.
  2. Install the bolts securing the center bearing heat shield to the center bearing. Tighten: Tighten the center bearing heat shield bolts to 8 N.m (71 lb in).
  3. Lower the vehicle.

Exhaust System Description

IMPORTANTUse of non-OEM parts may cause driveability concerns.

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

In order to secure the exhaust pipe 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 pipe 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 body and other components from damage due to the heat from the exhaust system.

The exhaust system may be comprised of the following components

  1. Exhaust manifold
  2. Exhaust pipes
  3. Catalytic converters
  4. Exhaust muffler
  5. Exhaust resonator, if equipped
  6. Exhaust tail pipe, if equipped
  7. Exhaust hangers
  8. Exhaust heat shields

Resonator

Some exhaust systems are 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.

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. Platium (Pt)
  2. Palladium (Pd)
  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.

Special Tools

Special Tools Illustration Tool Number/ Description J 35314-A Exhaust Back Pressure Gage J 42640 Steering Column Anti Rotation Pin

Scheme 12

Scheme 12: Special Tools
Scheme 12: Special Tools

Scheme 13

Scheme 13
Scheme 13

See also:
• Strategy Based Diagnosis
• Hot Exhaust System Caution
• Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1
• Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1
• Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1
• Exhaust Service Caution
• Protective Goggles and Glove Caution
• Oil Level Indicator and Tube Replacement
• Exhaust Manifold Cleaning and Inspection - Left
• Fastener Notice
• Accessory Mounting Brackets Replacement
• Exhaust Manifold Cleaning and Inspection
• Fuel Injector Sight Shield Replacement
• Lifting and Jacking the Vehicle
• Intermediate Steering Shaft Replacement - Center
• Exhaust Manifold Cleaning and Inspection
• Exhaust Manifold Installation - Left
• Starter Motor Replacement (LA3, LY9)
• Exhaust Manifold Installation - Right
• Exhaust System Inspection Notice
• Flex Decoupler Notice
• Symptoms - Engine Exhaust
• Exhaust System Description
• Restricted Exhaust
• Exhaust Leakage
• Exhaust Noise
• Catalytic Converter Replacement - Left (LA3, LY9)
• Catalytic Converter Replacement - Left (LY7)
• Catalytic Converter Replacement - Left (LS6)
• Catalytic Converter Replacement - Right (LA3, LY9)
• Catalytic Converter Replacement - Right (LY7)
• Catalytic Converter Replacement - Right (LS6)
• Fastener Tightening Specifications
• Exhaust Hanger Replacement
• Exhaust Manifold Replacement - Left (LY7)
• Exhaust Manifold Replacement - Left (LA3, LY9)
• Exhaust Manifold Replacement - Right (LA3, LY9)
• Exhaust Manifold Replacement - Right (LY7)
• Exhaust System Replacement (LA3, LY9)
• Exhaust System Replacement (LS6)
• Exhaust Manifold Heat Shield Replacement - Left (LS6)