56. Intake Manifold Cleaning and Inspection

Intake Manifold Cleaning and Inspection
Cleaning Procedure





1. Remove and discard the intake manifold-to-cylinder head gaskets (514).
2. Remove the manifold absolute pressure (MAP) sensor.
3. Remove the evaporative emission (EVAP) canister purge solenoid valve, EVAP tubes, and fuel rail with injectors.
4. Remove the throttle body and gasket.





5. Clean the intake manifold in solvent.

6. Caution: Refer to Safety Glasses Caution.

Dry the intake manifold with compressed air.

Inspection Procedure
1. Inspect the manifold for the following conditions:
^ Loose threaded inserts (1)
^ Damaged MAP sensor bore (2)
^ Damaged fuel injector bore (3)
^ Damaged gasket or sealing surfaces (4)
^ Damaged or broken vacuum fittings (5)
^ Debris or restrictions within the passages of the manifold
^ Inspect the composite intake manifold assembly for cracks or other damage.

2. Inspect the intake manifold cylinder head deck for warpage.
1. Locate a straight edge across the intake manifold cylinder head deck surface. Position the straight edge across a minimum of two runner port openings.
2. Insert a feeler gage between the intake manifold and the straight edge. An intake manifold with warpage in excess of 3 mm (0.118 inch) over a 200 mm (7.87 inch) area is warped and should be replaced.