GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

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

  2. Object Number: 455543  Size: SH
  3. Remove the nuts from the catalytic converter to the exhaust downpipe.

  4. Object Number: 455546  Size: SH
  5. Remove the four bolts securing the exhaust downpipe to the exhaust manifold.
  6. Remove the exhaust downpipe.

Installation Procedure


    Object Number: 455546  Size: SH
  1. Install the exhaust downpipe.
  2. Install the four bolts securing the exhaust downpipe to exhaust manifold.
  3. Important: Do not tighten the bolts at this time.


    Object Number: 455543  Size: SH
  4. Install the nuts from the catalytic converter to the exhaust downpipe.
  5. Tighten the catalytic converter bolts.
  6. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    Tighten
    Tighten the catalytic converter bolts to 24 N·m (18 lb ft).


    Object Number: 455543  Size: SH
  7. Tighten the exhaust downpipe to exhaust manifold bolts.
  8. Tighten
    Tighten the two right exhaust downpipe to exhaust manifold bolts to 40 N·m (30 lb ft) and the left exhaust downpipe to exhaust manifold bolts to 40 N·m (30 lb ft).

    Important: When correctly aligned the flanges for the converter and the exhaust manifold rear pipe are parallel. If this condition does not exist, realign the exhaust manifold rear pipe by loosening the exhaust manifold bolts and repositioning the exhaust manifold rear pipe.

  9. Lower the vehicle.