GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    Caution: Refer to Exhaust Service Caution in the Preface section.

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

    Notice: Refer to Flex Decoupler Notice in the Preface section.

    Notice: Refer to Catalytic Converter Movement Notice in the Preface section.


    Object Number: 1252135  Size: SH
  1. Disconnect the negative battery cable.
  2. Remove the spark plug cover.

  3. Object Number: 1252124  Size: SH
  4. Remove the exhaust manifold heat shield bolts and the heat shield.

  5. Object Number: 1252162  Size: SH
  6. Remove the catalytic converter upper flange nuts.

  7. Object Number: 1252123  Size: SH
  8. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  9. Remove the splash guard. Refer to Engine Cover Replacement in Frame and Underbody.
  10. Remove the catalytic converter lower flange nuts.

  11. Object Number: 1252142  Size: SH
  12. Remove the front exhaust pipe mounting bracket bolts and bracket.
  13. Remove the catalytic converter.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1252142  Size: SH
  1. Fit the catalytic converter onto the connecting pipe, raise the front exhaust pipe, and install the front exhaust pipe mounting bracket nuts and bracket.
  2. Tighten
    Tighten the connecting pipe mounting bracket nuts to 30 N·m (22 lb ft).


    Object Number: 1252123  Size: SH
  3. Install the catalytic converter lower flange nuts.
  4. Tighten
    Tighten the catalytic converter-to-connecting pipe nuts to 40 N·m (30 lb ft).


    Object Number: 1252162  Size: SH
  5. Install the splash guard. Refer to Engine Cover Replacement in Frame and Underbody.
  6. Lower the vehicle.
  7. Install the catalytic converter upper flange bolts.
  8. Tighten
    Tighten the catalytic converter-to-exhaust manifold nuts to 40 N·m (30 lb ft).


    Object Number: 1252124  Size: SH
  9. Install the exhaust manifold heat shield and heat shield bolts.
  10. Tighten
    Tighten the exhaust manifold heat shield bolts to 3 N·m (27 lb ft).


    Object Number: 1252135  Size: SH
  11. Install the exhaust cover mounting bolts and the engine cover.
  12. Connect the negative battery cable.