Intake Manifold Cleaning and Inspection m

1. Remove and discard the intake manifold-to-cylinder head gaskets (514).



2. Remove the manifold absolute pressure (MAP) sensor. Refer to Intake Manifold Removal .
3. Remove the evaporative emission (EVAP) canister purge solenoid valve, EVAP tubes, and fuel rail with injectors. Refer to Fuel Rail and Injectors Removal .
4. Remove the throttle body and gasket. Refer to Throttle Body Removal .
5. Clean the intake manifold (500) in solvent.

Caution: Refer to Safety Glasses Caution in the Preface section.

6. Dry the intake manifold with compressed air.

1. Inspect the manifold for the following conditions:

•	Damaged gasket or sealing surfaces

•	Loose threaded inserts or studs

•	Debris or restrictions within the passages of the manifold

•	Damaged or broken vacuum fittings

•	Inspect the composite intake manifold assembly for cracks or other damage.




2. Inspect the intake manifold cylinder head deck for warpage.

2.1.	Locate a straight edge across the intake manifold cylinder head deck surface.

Position the straight edge across a minimum of 2 runner port openings.

2.2.	Insert a feeler gage between the intake manifold and the straight edge.

An intake manifold with warpage in excess of 3 mm (0.118 in) over a 200 mm (7.87 in) area is warped and should be replaced.