GM Service Manual Online
For 1990-2009 cars only

Catalytic Converter Replacement w/o Manifold Pipe

Removal Procedure

  1. Raise the vehicle.
  2. Support the three way catalytic converter.
  3. Support the exhaust manifold pipe assembly.

  4. Object Number: 25258  Size: SH
  5. Remove the three way catalytic converter from the intermediate pipe.

  6. Object Number: 72283  Size: SH
  7. Remove the three way catalytic converter from the exhaust manifold pipe assembly.

  8. Object Number: 25266  Size: SH
  9. Remove the three way catalytic converter and seals.
  10. Clean the flange surfaces.

Installation Procedure


    Object Number: 25266  Size: SH
  1. Install the three way catalytic converter seals.

  2. Object Number: 25258  Size: SH
  3. Install the three way catalytic converter to the intermediate pipe assembly.

  4. Object Number: 72283  Size: SH
  5. Install the three way catalytic converter to the exhaust manifold pipe assembly.
  6. Lower the vehicle.

Catalytic Converter Replacement w/ Manifold Pipe

Removal Procedure

  1. Raise the vehicle.
  2. Support the three way catalytic converter.

  3. Object Number: 25505  Size: SH
  4. Remove the intermediate pipe from the three way catalytic converter.

  5. Object Number: 72277  Size: SH
  6. Remove the exhaust manifold pipe assembly from the exhaust manifold.
  7. Remove the exhaust manifold seal and the three way catalytic converter seal.
  8. Clean the flange surfaces.

Installation Procedure


    Object Number: 72277  Size: SH
  1. Install the exhaust manifold seal and the three way catalytic converter seal.
  2. Install the exhaust manifold pipe assembly to the exhaust manifold.

  3. Object Number: 25505  Size: SH
  4. Install the intermediate pipe to the three way catalytic converter.
  5. Lower the vehicle.