GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    Warning: Refer to Battery Disconnect Warning in the Preface section.

  1. Open the hood.
  2. Disconnect the battery.
  3. • Detach the negative connection from the ground terminal.
    • Loosen the nut.
  4. Remove the mixture regulator oxygen sensor. Refer to Heated Oxygen Sensor 1 Replacement.
  5. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
  6. Remove the resonator. Refer to Air Cleaner Inlet Duct Replacement.
  7. Remove the oil dipstick guide tube. Refer to Oil Level Indicator and Tube Replacement.
  8. Raise the vehicle by its full height.

  9. Object Number: 1936899  Size: SH
  10. Release the wiring harness plug, oxygen sensor of the catalytic converter control (1).
  11. • Disconnect the wiring harness connector (3).
    • Disconnect the wiring harness (2) from the bracket

    Object Number: 1946674  Size: SH
  12. Remove the front exhaust pipe (2) from the catalytic converter (1).
  13. Remove the 3 nuts (3).


    Object Number: 1945762  Size: SH
  14. Remove the heat shield from the catalytic converter.
  15. Remove the 2 bolts.

  16. Remove the exhaust system.
  17. Remove the 6 damper rings.


    Object Number: 1945763  Size: MF
  18. Remove the catalytic converter from the catalytic converter bracket (1).
  19. Remove the 2 bolts (3, 4).

  20. Remove the bracket for the catalytic converter (1) from the cylinder block.
  21. Remove the 2 bolts (2, 5).

  22. If equipped with air conditioning, remove the drive belt. Refer to Drive Belt Replacement.

  23. Object Number: 1945764  Size: SH
  24. If equipped with air conditioning, remove the compressor. Refer to Air Conditioning Compressor Replacement.
  25. • Remove the 3 bolts (1).
    • Set aside.
  26. Lower the vehicle by its full height.

  27. Object Number: 1945765  Size: SH
  28. Remove the 2 engine transport shackles (1).
  29. Remove the 2 bolts (2).


    Object Number: 1945767  Size: SH
  30. Remove the exhaust manifold heat shield (3).
  31. • Remove the wiring harness bracket (2).
    • Remove the bolt (1).

    Object Number: 1945773  Size: SH
  32. Remove the exhaust manifold.
  33. Remove the 9 nuts (1).

Installation Procedure

  1. Clean the sealing surface.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the exhaust manifold.
  4. Use new gasket and nuts.

    Tighten
    Tighten the 9 nuts to 20 N·m (15 lb ft).

  5. Replace the heat shield.
  6. Install the wiring harness bracket of the oxygen sensor mixture regulator.

    Tighten
    Tighten the bolt to 15 N·m (11 lb ft).

  7. Raise the vehicle by its full height.
  8. If equipped with air conditioning, install the compressor. Refer to Air Conditioning Compressor Replacement.
  9. Tighten
    Tighten the 3 bolts to 22 N·m (16 lb ft).

  10. In vehicles with air conditioning, install the drive belt. Refer to Drive Belt Replacement.
  11. Install the catalytic converter bracket.
  12. Install to the cylinder block.

    Tighten
    Tighten the 2 bolts to 20 N·m (15 lb ft).

  13. Install the catalytic converter to the bracket.
  14. Tighten
    Tighten the 2 bolts to 20 N·m (15 lb ft).

  15. Install the heat shield to the catalytic converter.
  16. Tighten
    Tighten the 2 bolts to 8 N·m (70 lb in).

  17. Install the exhaust system.
  18. Install the 6 damper rings.

  19. Install the front exhaust pipe to the catalytic converter.
  20. Use a new gasket.

    Tighten
    Tighten the 3 new nuts to 20 N·m (15 lb ft).

  21. Install the catalytic converter control oxygen sensor wiring harness.
  22. • Connect the wiring harness plug.
    • Install the wiring harness into the bracket.
  23. Install the oil dipstick guide tube. Refer to Oil Level Indicator and Tube Replacement.
  24. Clean the 2 threads.
  25. Install the 2 engine transport shackles.
  26. Tighten
    Tighten the 2 bolts to 25 N·m (18 lb ft).

  27. Install the bracket, wiring harness for the mixture regulator oxygen sensor to the cylinder head together with the exhaust manifold heat shield.
  28. Tighten
    Tighten the bolt to 25 N·m (18 lb ft).

  29. Install the mixture regulator oxygen sensor. Refer to Heated Oxygen Sensor 1 Replacement.
  30. Install the resonator. Refer to Air Cleaner Inlet Duct Replacement.
  31. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
  32. Connect the battery.
  33. Install the negative connection to the ground terminal.

    Tighten
    Tighten the nut to 5 N·m (44 lb in).

  34. Inspect and correct the engine oil level.
  35. For programming procedures, refer to Control Module References.
  36. Close the hood.