GM Service Manual Online
For 1990-2009 cars only

Exhaust Manifold Replacement Left

Removal Procedure


    Object Number: 439775  Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the 3-way catalytic converter. Refer to Catalytic Converter Replacement in Engine Exhaust.
  3. Disconnect the connector position assurance (CPA) retainer.
  4. Disconnect the wiring harness connector (1) from the oxygen sensor.
  5. Remove the oxygen sensor connector from the spark plug wire harness bracket.

  6. Object Number: 577702  Size: SH
  7. Remove the oxygen sensor from the exhaust manifold.

  8. Object Number: 211645  Size: SH
  9. Disconnect the numbers 1, 3 and 5 spark plug wires from the spark plugs.

  10. Object Number: 14824  Size: SH
  11. Remove the numbers 3 and 5 spark plugs from the cylinder head.

  12. Object Number: 613220  Size: SH
  13. Remove the two rear exhaust manifold studs and nut from the exhaust manifold.
  14. Lower the vehicle.

  15. Object Number: 14824  Size: SH
  16. Remove the number 1 spark plug from the cylinder head.

  17. Object Number: 613198  Size: SH
  18. Remove the exhaust manifold heat shield nuts.
  19. Remove the exhaust manifold heat shields from the exhaust manifold.

  20. Object Number: 613220  Size: SH
  21. Remove the exhaust manifold studs and nut from the exhaust manifold.
  22. Remove the exhaust manifold and gasket from the cylinder head.
  23. Remove the heat shield studs from the exhaust manifold, if necessary.

Installation Procedure


    Object Number: 613220  Size: SH
  1. Install the heat shield studs to the exhaust manifold, if necessary.
  2. Install the exhaust manifold gasket and manifold to the cylinder head studs.
  3. Install the front two exhaust manifold studs and nut to the exhaust manifold.
  4. Tighten

        • Tighten the two front exhaust manifold studs to 15 N·m (11 lb ft).
        • Tighten the exhaust manifold nut to 18 N·m (13 lb ft).

    Object Number: 613198  Size: SH
  5. Install the exhaust manifold heat shields to the exhaust manifold.
  6. Install the exhaust manifold heat shield nuts.
  7. Tighten
    Tighten the exhaust manifold heat shield nuts to 10 N·m (89 lb in).


    Object Number: 14824  Size: SH
  8. Install the number 1 spark plug to the cylinder head.
  9. Tighten
    Tighten the number 1 spark plug to 27 N·m (20 lb ft).

  10. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  11. Object Number: 613220  Size: SH
  12. Install the two rear exhaust manifold studs and nut to the exhaust manifold.
  13. Tighten

        • Tighten the two rear exhaust manifold studs to 15 N·m (11 lb ft).
        • Tighten the exhaust manifold nut to 18 N·m (13 lb ft).

    Object Number: 14824  Size: SH
  14. Install the numbers 3 and 5 spark plugs to the cylinder head.
  15. Tighten
    Tighten the numbers 3 and 5 spark plugs to 27 N·m (20 lb ft).


    Object Number: 211645  Size: SH
  16. Connect the numbers 1, 3 and 5 spark plug wires to the spark plugs.

  17. Object Number: 577702  Size: SH
  18. Install the oxygen sensor to the exhaust manifold.
  19. Tighten
    Tighten the oxygen sensor to 42 N·m (31 lb ft).


    Object Number: 439775  Size: SH
  20. Install the oxygen sensor connector to the spark plug wire harness bracket.
  21. Connect the wire harness connector (1) to the oxygen sensor connector.
  22. Connect the CPA retainer.
  23. Install the 3-way catalytic converter. Refer to Catalytic Converter Replacement in Engine Exhaust.
  24. Lower the vehicle.

Exhaust Manifold Replacement Right

Removal Procedure


    Object Number: 439410  Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the 3-way catalytic converter. Refer to Catalytic Converter Replacement in Engine Exhaust.
  3. Disconnect the connector position assurance (CPA) retainer.
  4. Disconnect the oxygen sensor electrical connector (3) from the harness.

  5. Object Number: 577706  Size: SH
  6. Remove the oxygen sensor connector rosebud from the engine lift bracket.
  7. Remove the oxygen sensor from the exhaust manifold.

  8. Object Number: 211642  Size: SH
  9. Disconnect the numbers 4 and 6 spark plug wires from the spark plugs.

  10. Object Number: 14824  Size: SH
  11. Remove the number 6 spark plug from the cylinder head.

  12. Object Number: 613225  Size: SH
  13. Remove the two rear exhaust manifold studs and nut from the exhaust manifold.
  14. Lower the vehicle.

  15. Object Number: 211642  Size: SH
  16. Disconnect the number 2 spark plug wire from the spark plug.

  17. Object Number: 14824  Size: SH
  18. Remove the numbers 2 and 4 spark plugs from the cylinder head.

  19. Object Number: 613223  Size: SH
  20. Remove the exhaust manifold heat shield nuts.
  21. Remove the exhaust manifold heat shields from the exhaust manifold.

  22. Object Number: 613225  Size: SH
  23. Remove the two front exhaust manifold studs and nut from the exhaust manifold.
  24. Remove the right exhaust manifold and gasket from the cylinder head.
  25. Remove the heat shield studs from the exhaust manifold, if necessary.

Installation Procedure


    Object Number: 613225  Size: SH
  1. Install the heat shield stud to the exhaust manifold, if necessary.
  2. Install the right exhaust manifold gasket and manifold to the cylinder head studs.
  3. Install the two front exhaust manifold studs and nuts to the exhaust manifold.
  4. Tighten

        • Tighten the two front exhaust manifold studs to 15 N·m (11 lb ft).
        • Tighten the exhaust manifold nuts to 18 N·m (13 lb ft).

    Object Number: 613223  Size: SH
  5. Install the exhaust manifold heat shields to the exhaust manifold.
  6. Install the exhaust manifold heat shield nut.
  7. Tighten
    Tighten the exhaust manifold heat shield nuts to 10 N·m (89 lb in).


    Object Number: 14824  Size: SH
  8. Install the numbers 2 and 4 spark plugs to the cylinder head.
  9. Tighten
    Tighten the numbers 2 and 4 spark plugs to 27 N·m (20 lb ft).


    Object Number: 211642  Size: SH
  10. Connect the number 2 spark plug wire to the spark plug.
  11. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  12. Object Number: 613225  Size: SH
  13. Install the two rear exhaust manifold studs and nut to the exhaust manifold.
  14. Tighten

        • Tighten the two rear exhaust manifold studs to 15 N·m (11 lb ft).
        • Tighten the exhaust manifold nut to 18 N·m (13 lb ft).

    Object Number: 14824  Size: SH
  15. Install the number 6 spark plug to the cylinder head.
  16. Tighten
    Tighten the number 6 spark plug to 27 N·m (20 lb ft).


    Object Number: 211642  Size: SH
  17. Connect the numbers 4 and 6 spark plug wires to the spark plugs.

  18. Object Number: 577706  Size: SH
  19. Install the oxygen sensor to the exhaust manifold.
  20. Tighten
    Tighten the exhaust manifold to 42 N·m (31 lb ft).

  21. Connect the oxygen sensor electrical connector rosebud to the engine lift bracket.

  22. Object Number: 439410  Size: SH
  23. Connect the oxygen sensor electrical connector (3) to the wiring harness.
  24. Connect the CPA retainer.
  25. Install the 3-way catalytic converter. Refer to Catalytic Converter Replacement in Engine Exhaust.
  26. Lower the vehicle.