GM Service Manual Online
For 1990-2009 cars only

Exhaust Manifold Replacement with Manual

Removal Procedure

    Notice: Do not over-flex or damage the flex joint when moving the flex joint from the normal mounting position.

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

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

  5. Object Number: 25254  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: 25254  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: 72283  Size: SH
  4. Install the exhaust manifold pipe assembly to the three way catalytic converter.
  5. Lower the vehicle.

Exhaust Manifold Replacement with Automatic

Removal Procedure

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

  3. Object Number: 25276  Size: SH
  4. Remove the exhaust manifold pipe assembly from the three way catalytic converter.

  5. Object Number: 25280  Size: SH
  6. Remove the exhaust manifold pipe assembly from the exhaust manifold.
  7. Remove the exhaust manifold and three way catalytic converter seals.
  8. Clean the flange surfaces.

Installation Procedure


    Object Number: 25280  Size: SH
  1. Install the exhaust manifold and the three way catalytic converter seals.
  2. Install the exhaust manifold pipe assembly to the exhaust manifold.

  3. Object Number: 25276  Size: SH
  4. Install the exhaust manifold pipe assembly to the three way catalytic converter.
  5. Lower the vehicle.