Exhaust Manifold Cleaning and Inspection

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Inspecting Exhaust Manifold

Courtesy of GENERAL MOTORS CORP.

Clean the exhaust manifold.
Inspect the exhaust manifold for cracks or damage.
Inspect the exhaust manifold threads and studs (if necessary).

Fig 2: Checking Exhaust Manifold For Flatness

Courtesy of GENERAL MOTORS CORP.

Check the exhaust manifold mating surface for flatness. Use a straight edge and a feeler gauge.
Replace the exhaust manifold if necessary.