GM Service Manual Online
For 1990-2009 cars only

Exhaust Manifold Replacement Right

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Disconnect the exhaust pipe from the exhaust manifold. Refer to Catalytic Converter Replacement in Engine Exhaust.
  3. Lower the vehicle.
  4. Remove the air cleaner outlet duct from the throttle body and the air cleaner assembly. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  5. Remove the secondary air injection (AIR) pipe assembly, if equipped from the exhaust manifold. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 2 in Engine Controls.
  6. Disconnect the spark plug wires from the spark plugs. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.

  7. Object Number: 332371  Size: SH
  8. Remove the exhaust manifold bolts.
  9. Remove the exhaust manifold and the spark plug wire shields from the engine.
  10. Clean all gasket surfaces. Refer to Exhaust Manifold Cleaning and Inspection .
  11. Remove the heat shield from the exhaust manifold, if necessary.

Installation Procedure


    Object Number: 332371  Size: SH
  1. Install the heat shield to the exhaust manifold, if removed.
  2. 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.

  3. Install the heat shield bolts.
  4. Tighten
    Tighten the heat shield bolts to 9 N·m (80 lb in).

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

  5. Sub-assemble the bolts, spark plug wire shields, and NEW gaskets to the exhaust manifold.
  6. Install the exhaust manifold. Refer to Exhaust Manifold Installation (Right) .
  7. Install the AIR pipe assembly, if equipped to the exhaust manifold. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 2 in Engine Controls.
  8. Connect the spark plug wires to the spark plugs. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
  9. Install the air cleaner outlet duct to the throttle body and the air cleaner assembly. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  10. Raise the vehicle.
  11. Connect the exhaust pipe to the exhaust manifold. Refer to Catalytic Converter Replacement in Engine Exhaust.
  12. Lower the vehicle.

Exhaust Manifold Replacement Left

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle
  2. Disconnect the exhaust pipe from the exhaust manifold. Refer to Catalytic Converter Replacement in Engine Exhaust.
  3. Lower the vehicle.
  4. Remove the secondary air injection (AIR) pipe assembly, if equipped from the exhaust manifold. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 1 in Engine Controls.
  5. Disconnect the spark plug wires from the spark plugs. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.

  6. Object Number: 172982  Size: SH
  7. Disconnect the exhaust gas recirculation (EGR) valve inlet pipe from the exhaust manifold.

  8. Object Number: 246797  Size: SH
  9. Disconnect the engine coolant temperature (ECT) gauge sensor electrical connector.

  10. Object Number: 332373  Size: SH
  11. Remove the exhaust manifold bolts and the stud.
  12. Remove the exhaust manifold and the spark plug wire shields from the engine.
  13. Clean all gasket surfaces. Refer to Exhaust Manifold Cleaning and Inspection .
  14. Remove the heat shield from the exhaust manifold, if necessary.

Installation Procedure


    Object Number: 332373  Size: SH
  1. Install the heat shield to the exhaust manifold, if removed.
  2. 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.

  3. Install the heat shield bolts.
  4. Tighten
    Tighten the heat shield bolts to 9 N·m (80 lb in).

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

  5. Sub-assemble the bolts, spark plug wire shields, and NEW gaskets to exhaust manifold.
  6. Install the exhaust manifold. Refer to Exhaust Manifold Installation (Left) .

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


    Object Number: 246797  Size: SH
  10. Connect the (ECT) gauge sensor electrical connector.
  11. Connect the spark plug wires to the spark plugs. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
  12. Install the AIR pipe assembly to the exhaust manifold. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 1 in Engine Controls.
  13. Raise the vehicle.
  14. Connect the exhaust pipe to the exhaust manifold. Refer to Catalytic Converter Replacement in Engine Exhaust.
  15. Lower the vehicle.