Exhaust Pipe: Service and Repair

EXHAUST MANIFOLD PIPE REPLACEMENT

REMOVAL PROCEDURE
1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Remove the engine protection shield.




3. Remove the exhaust muffler.
4. Remove the clip around the engine harness and the oxygen sensor pigtail.
5. Disconnect the connector position assurance (CPA) retainer.
6. Disconnect the oxygen sensor electrical connector.
7. If replacing the exhaust manifold pipe, remove the oxygen sensor.




8. Remove the exhaust manifold pipe nuts.




9. Remove the exhaust manifold pipe.
10. Slide the exhaust manifold pipe hanger out of the exhaust pipe hanger bracket.
11. Discard the exhaust manifold pipe seal.

INSTALLATION PROCEDURE




1. Install a new exhaust manifold pipe seal to the exhaust manifold pipe.
2. Install the exhaust manifold pipe.
3. Apply lubricant to the exhaust pipe hanger bracket in order to aid in installation.
4. Slide the exhaust manifold pipe hanger into the exhaust pipe hanger bracket.

NOTE: Refer to Fastener Notice in Service Precautions.




5. Install the exhaust manifold pipe nuts.

Tighten
Tighten the nuts to 50 N.m (39 lb ft).




6. If the exhaust mannitol pipe was replaced perform the following:
6.1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensor.
6.2. Install the old oxygen sensor.

Tighten
Tighten the oxygen sensor to 42 N.m (31 lb ft).

7. If the exhaust manifold pipe was not replaced, perform the following:
7.1. Connect the oxygen sensor electrical connector.
7.2. Connect the CPA retainer.
7.3. Install the clip around the engine harness and the oxygen sensor pigtail.
8. Install the exhaust muffler.
9. Install the engine protection shield.

Tighten
Tighten the bolts to 20 N.m (15 lb ft).

10. Lower the vehicle.