Exhaust Noise/leak (Replace Exhaust Manifold Fasteners and Gasket)

Some customers may comment on an exhaust noise or exhaust leak. The noise will appear to come from the area of the exhaust manifold.

The fasteners used to hold the exhaust manifold may have relaxed and lost clamping power. The manifold will then be allowed to move under certain conditions causing a small leak.

Install a new exhaust manifold gasket and fasteners. Use the part numbers listed below.

The new fasteners have the proper adhesive in patch form already on the threads. DO NOT use any additional thread lock material.

1. Remove the exhaust manifold fasteners and gasket and dispose of properly.
2. Make sure the manifold bolt holes in the cylinder head are clean of debris or foreign material.
3. Install a new exhaust manifold gasket.
4. Install the exhaust manifold using new fasteners.



5. Tighten all fasteners in sequence to 20 N·m (15 lb ft).
6. Tighten each fastener a second time with the same sequence and torque.
7. Tighten each fastener a third time with the same sequence and torque.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: