GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Replace the entire converter assembly in order to properly service the three way catalytic converter.

  1. Raise and suitably support the vehicle. Refer to Vehicle Lifting and Jacking in General Information.
  2. Remove the nuts from the manifold.
  3. Remove the bolts/screws from the intermediate exhaust pipe to the three way catalytic converter.
  4. Remove the three way catalytic converter.

Installation Procedure

  1. Install the new three way catalytic converter.
  2. Install the intermediate exhaust pipe and the bolts/screws to the three way catalytic converter.
  3. Install the nuts to the manifold.
  4. Tighten

    1. Tighten the nuts to the manifold to 33 N·m (24 lb ft).
    2. Tighten the intermediate exhaust pipe bolts/screws to the 47 N·m (35 lb ft).

    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.

  5. Lower the vehicle.