GM Service Manual Online
For 1990-2009 cars only

Exhaust Manifold Replacement Left

Removal Procedure


    Object Number: 246797  Size: SH
  1. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  2. Disconnect the engine coolant temperature (ECT) sensor.

  3. Object Number: 321606  Size: SH
  4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Remove the left front tire. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  6. Remove the left fender wheelhouse extension.
  7. Remove the catalytic converter assembly. Refer to Catalytic Converter Replacement in Engine Exhaust.

  8. Object Number: 172982  Size: SH
  9. Remove the EGR valve inlet pipe from the exhaust manifold.

  10. Object Number: 317450  Size: SH
  11. Remove the spark plug wires from the spark plugs. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
  12. Remove the spark plug wire support bolts.
  13. Remove the spark plug wire support with the spark plug wires.

  14. Object Number: 173197  Size: SH
  15. Remove the front four exhaust manifold bolts through the wheelhouse.
  16. Remove the two rear exhaust manifold bolts through the engine cover opening.
  17. Remove the exhaust manifold, gaskets and the spark plug wire shields from underneath the vehicle.
  18. Clean all gasket surfaces. Refer to Exhaust Manifold Cleaning and Inspection .

Installation Procedure


    Object Number: 476818  Size: SH

    Important: To assist in installing the exhaust manifold to the engine, the tabs on a NEW exhaust manifold gasket will hold the gasket and the bolts in place.

  1. Sub-assemble the NEW gaskets, the spark plug wire shields, and the bolts to the exhaust manifold.
  2. Ensure that the exhaust manifold bolts are held in place by the tabs on the exhaust manifold gaskets.
  3. Install the exhaust manifold. Refer to Exhaust Manifold Installation .
  4. • Tighten the two rear exhaust manifold bolts through the engine cover opening.
    • Tighten the front four exhaust manifold bolts through the wheelhouse.

    Object Number: 317450  Size: SH
  5. Install the spark plug wires to the spark plugs. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
  6. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the spark plug wire support and bolts.
  8. Tighten
    Tighten the spark plug wire support bolts to 12 N·m (106 lb in).


    Object Number: 172982  Size: SH
  9. Install the EGR valve inlet pipe to the exhaust manifold.
  10. Tighten
    Tighten the EGR valve inlet pipe exhaust manifold nut to 30 N·m (22 lb ft).

  11. Install the catalytic converter assembly. Refer to Catalytic Converter Replacement in Engine Exhaust.

  12. Object Number: 321606  Size: SH
  13. Install the fender wheelhouse extension.
  14. Install the left front tire. Refer to Tire and Wheel Removal and Installation in Tire and Wheels.
  15. Lower the vehicle.

  16. Object Number: 246797  Size: SH
  17. Connect the ECT sensor electrical connector.
  18. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.

Exhaust Manifold Replacement Right

Removal Procedure


    Object Number: 321606  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the right front tire. Refer to Tire and Wheel Removal and Installation in Tire and Wheels.
  3. Remove the right fender wheelhouse extension.
  4. Disconnect the spark plug wires from the spark plugs. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
  5. Remove the catalytic converter assembly. Refer to Catalytic Converter Replacement in Engine Exhaust.

  6. Object Number: 43728  Size: SH
  7. Remove the exhaust manifold bolts through the wheelhouse.
  8. Remove the exhaust manifold with the exhaust manifold gaskets and the spark plug wire shields from the engine.
  9. Clean all gasket surfaces. Refer to Exhaust Manifold Cleaning and Inspection .

Installation Procedure


    Object Number: 476818  Size: SH

    Important: To assist in installing the exhaust manifold to the engine, the tabs on a NEW exhaust manifold gasket will hold the gasket and the bolts in place.

  1. Sub-assemble the NEW gaskets, the spark plug wire shields, and the bolts to the exhaust manifold.
  2. Ensure that the exhaust manifold bolts are held in place by the tabs on the exhaust manifold gaskets.
  3. Install the exhaust manifold. Refer to Exhaust Manifold Installation .
  4. Install the catalytic converter assembly. Refer to Catalytic Converter Replacement in Engine Exhaust.
  5. Install the spark plug wires. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.

  6. Object Number: 321606  Size: SH
  7. Install the fender wheelhouse extension.
  8. Install the front tire. Refer to Tire and Wheel Removal and Installation in Tire and Wheels.
  9. Lower the vehicle.