Catalytic Converter Replacement. Cadillac Concours 1997

For 1990-2009 cars

### Removal Procedure

1. Raise the vehicle and support the catalytic converter.
2. Remove the post-oxygen sensor heat shield.
3. Remove the post-oxygen sensor. Refer to Emission Component Locations.
4. Cut the catalytic converter outlet. Cut through the converter pipe only.
5. Remove the exhaust manifold rear pipe flange bolts.
6. Remove the converter.
7. Remove the portions of the converter outlet remaining in the intermediate pipe.

### Installation Procedure

1. Install the catalytic converter.Position the intermediate pipe inside of the catalytic converter outlet tube, for the needed clearance during the converter installation.
2. Install the converter seal.
3. Install the exhaust manifold rear pipe flange nuts.

Tighten
Tighten the rear pipe flange bolts to 24 N·m (30 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.

4. Install the U-bolt type clamp.

Tighten

• | Tighten the rear pipe flange bolts to 24 N·m (18 lb ft).

• | Tighten the clamp nuts to 50 N·m (37 lb ft).

5. Install the post oxygen sensor. Refer to Engine Controls.
6. Install the post oxygen sensor heat shield.