Muffler: Service and Repair

Muffler Replacement

Removal Procedure

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.

Important: Do not reuse any component of the exhaust system that is corroded or damaged.

Important: When replacing the muffler in a vehicle with the LL8 engine, the resonator and tailpipe must also be ordered. The 2 pieces may be attached with a clamp.

2. Inspect the exhaust system components to determine if they can be reused.




3. Remove the frame brace. Refer to Frame Brace Replacement (TrailBlazer EXT, Envoy XL) Frame Brace Replacement (TrailBlazer, Envoy, Bravada).
4. Remove the nuts that secure the muffler to the catalytic converter pipe.




5. Separate the muffler and the tail pipe assembly from the hanger insulators.
6. Lower the muffler and tail pipe assembly.




7. Suitably support the exhaust system.
8. Cut the exhaust pipe at the dashed line (1).
9. Remove the muffler from the tail pipe.

Installation Procedure

1. Install the new muffler to the tail pipe.




2. Attach the muffler and tail pipe to the hanger insulators.





Notice: Refer to Fastener Notice.

3. Install the muffler to the catalytic converter and secure with the nuts.

Tighten the nuts to 45 N.m (33 lb ft).

4. Loosely install the clamp to secure the muffler to the tail pipe.
5. Align the tail pipe in the proper position.

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

6. Inspect the exhaust system for leaks and underbody contact.
7. Install the frame brace. Refer to Frame Brace Replacement (TrailBlazer EXT, Envoy XL) Frame Brace Replacement (TrailBlazer, Envoy, Bravada).
8. Lower the vehicle.