Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2004 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Exhaust Manifold

Courtesy of GENERAL MOTORS CORP.

Clean the exhaust manifold mating surfaces.
Clean the exhaust manifold.
Inspect the exhaust manifold mating surfaces for damage.

Fig 2: Inspecting Exhaust Manifold Flange For Straightness

Courtesy of GENERAL MOTORS CORP.

Inspect the exhaust manifold flange for straightness, using a straight edge and a feeler gage.
If the exhaust manifold flange is warped more than 0.05 mm (0.002 in) replace the exhaust manifold.