Intake Manifold Cleaning & Inspection

WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

Clean the intake manifold mating surfaces.
Inspect the intake manifold for damage.
Inspect the intake manifold for cracks near metallic inserts.
Inspect the crankcase ventilation passages in the intake manifold face for blockage.

Fig 1: Intake Manifold
Courtesy of GENERAL MOTORS CORP.
Clean the crankcase ventilation passages with compressed air if necessary. Use a maximum of 172 kPa (25 psi) of air pressure.
Replace the intake manifold as necessary.

Fig 2: Cleaning Crankcase Ventilation Passages With Compressed Air
Courtesy of GENERAL MOTORS CORP.