Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Clean the exhaust manifold.
Inspect the exhaust manifold for cracks or damage.

Fig 1: Exhaust Manifold Cleaning And Inspection

Courtesy of GENERAL MOTORS CORP.

Inspect the exhaust manifold threads and studs (if necessary).
Check the exhaust manifold mating surface for flatness. Use a straight edge and a feeler gauge.

Fig 2: Checking Exhaust Manifold Mating Surface For Flatness

Courtesy of GENERAL MOTORS CORP.

Replace the exhaust manifold if necessary.