Intake 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 Intake Manifold

Courtesy of GENERAL MOTORS CORP.

Clean the intake manifold gasket mating surface.
Inspect the threads on the retaining bolts.
Inspect the intake manifold for cracks.
Clean the internal ports of all debris.
Replace the intake manifold if necessary.