55. Intake Manifold Clean and Inspect

Intake Manifold Cleaning and Inspection

Important: Do not use the intake manifold gaskets or end seals again.

1. Clean the intake manifold in an approved solvent.
^ Clean debris out of all bolt holes. Clean the intake manifold gasket sealing surfaces.
^ Clean all intake manifold ports.





2. Caution: Refer to Safety Glasses Caution in Service Precautions.

Dry the intake manifold with compressed air.
3. Inspect the following:
^ The intake manifold bolt holes (1) for cracks and/or damage
^ The Manifold Absolute Pressure (MAP) sensor sealing surface (2) for damage
^ The Evaporative Emission (EVAP) purge solenoid sealing surface (4) for damage. The purge solenoid bolt has a sealer that may come off during removal of the bolt. Ensure all sealant is removed from the bolt hole.
^ The intake manifold-to-cylinder head sealing surfaces (3) for damage
^ The throttle body studs (5) for damage. Replace as necessary.
^ The throttle body mounting surface (6) for damage
^ The oil fill tube hole (7) for signs of leakage. Reseal as necessary.
^ Positive Crankcase Ventilation (PCV) port (8) for debris or varnish buildup