Intake Manifold Cleaning and Inspection (LAP, LAT, LE5, LE8, LE9)

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

Fig 1: View Of Intake Manifold

Courtesy of GENERAL MOTORS CORP.

Clean the intake manifold mating surfaces (2).
Inspect the intake manifold (1) for damage.
Inspect the intake manifold for cracks near metallic inserts.
Inspect the crankcase ventilation passages in the intake manifold face for blockage.

Fig 2: Cleaning Crankcase Ventilation Passages

Courtesy of GENERAL MOTORS CORP.

WARNING: Refer to Safety Glasses Warning .

Clean the crankcase ventilation passages (1) with compressed air if necessary. Use a maximum of 172 kPa (25 psi) of air pressure.
Replace the intake manifold as necessary.