Intake Manifold Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.

Clean the intake manifold (1) mating surfaces.

Fig 1: Intake Manifold
Courtesy of GENERAL MOTORS COMPANY
Inspect the intake manifold for damage.
Inspect the intake manifold for cracks near metallic inserts.
Inspect the crankcase ventilation passages (1) in the intake manifold face for blockage.

Fig 2: Crankcase Ventilation Passages
Courtesy of GENERAL MOTORS COMPANY
Clean the crankcase ventilation passages with compressed air if necessary. Use a maximum of 172 kPa (25 psi) of air pressure.
WARNING: Refer to Safety Glasses Warning .
Replace the intake manifold as necessary.