Exhaust System Replacement RPO LD8

Caution: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.

Caution: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.

Important: Servicing of the mufflers, resonator or pipe requires the replacement of the exhaust system as a complete assembly.

1. Remove the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .
2. Remove the connector position assurance (CPA) retainer.
3. Disconnect the heated oxygen sensor (HO2S) electrical connector.



4. Remove the HO2S.



5. Remove the muffler to exhaust manifold pipe nuts.
6. Suitably support the exhaust system.



7. Remove the exhaust hanger to the rear suspension support bracket bolts.



8. Remove the rear exhaust hanger bracket to the rear compartment side rail bolts (1).
9. With the aid of an assistant, lower and remove the exhaust system.
10. Remove and discard the muffler to exhaust manifold pipe gasket.



11. Remove the rear exhaust hanger to hanger bracket nuts.
12. Remove the rear exhaust hanger brackets.

Notice: When inspecting or replacing exhaust system components, make sure there is adequate clearance from all points on the underbody to prevent overheating of the floor pan and possible damage to the passenger compartment insulation and trim materials.

1. Install the rear exhaust hanger brackets.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the rear exhaust hanger to hanger bracket nuts.

Tighten
Tighten the nuts to 30 N·m (22 lb ft).




3. Install a NEW muffler to exhaust manifold pipe gasket onto the studs.
4. With the aid of an assistant, raise the exhaust system.
5. Install the muffler to rear exhaust manifold pipe.
6. Install and snug the muffler to rear exhaust manifold pipe nuts.



7. Install the rear exhaust hanger bracket to the rear compartment side rail bolts (1).

Tighten
Tighten the bolts to 50 N·m (37 lb ft).




8. Install the exhaust hanger to the rear suspension support bracket bolts.

Tighten
Tighten the bolts to 30 N·m (22 lb ft).

9. Tighten the muffler to rear exhaust manifold pipe nuts previously installed.

Tighten
Tighten the nuts to 25 N·m (18 lb ft).




10. If reusing the old HO2S, coat the threads with anti-sieze compound, GM P/N 12377953 or equivalent.
11. Install the HO2S.

Tighten
Tighten the sensor to 41 N·m (30 lb ft).




12. Connect the HO2S electrical connector.
13. Install the CPA retainer.
14. Install the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .

Exhaust System Replacement RPO L26

Caution: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.

Caution: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Remove the muffler to catalytic converter nuts.
3. Suitably support the exhaust system.



4. Remove the center exhaust hanger to the rear suspension support bracket bolts.



5. Remove the rear exhaust hanger bracket to rear compartment rail bolt.
6. With the aid of an assistant, lower and remove the exhaust system.
7. Remove and discard the catalytic converter to muffler gasket.



8. Remove the rear exhaust hanger to exhaust hanger bracket nut.
9. Remove the rear exhaust hanger bracket from the rear exhaust hanger.

1. Install the rear exhaust hanger bracket to the rear exhaust hanger.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the rear exhaust hanger to exhaust hanger bracket nut .

Tighten
Tighten the nut to 30 N·m (22 lb ft).





Notice: When inspecting or replacing exhaust system components, make sure there is adequate clearance from all points on the underbody to prevent overheating of the floor pan and possible damage to the passenger compartment insulation and trim materials.

3. Install a NEW catalytic converter to muffler gasket over the catalytic converter studs.

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

4. With the aid of an assistant, raise and install the exhaust system.
5. Install the muffler to catalytic converter nuts until snug.
6. Install the rear exhaust hanger bracket to rear compartment rail bolt.

Tighten
Tighten the bolt to 50 N·m (37 lb ft).




7. Install the center exhaust hangers to rear suspension support bracket bolts.

Tighten
Tighten the bolts to 30 N·m (22 lb ft).




8. Tighten the muffler to catalytic converter nuts previously installed in step 5.

Tighten
Tighten the nuts to 25 N·m (18 lb ft).

9. Lower the vehicle.