42. 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. Refer to Intake Manifold Removal (Without Active Fuel Management) (69. Intake Manifold Removal (Without Active Fuel Management))Intake Manifold Removal (With Active Fuel Management) (70. Intake Manifold Removal (With Active Fuel Management)).
3. Remove the evaporative emission (EVAP) canister purge solenoid valve, EVAP tubes, and fuel rail with injectors (500). Refer to Fuel Rail and Injectors Removal (68. Fuel Rail and Injectors Removal).
4. Remove the throttle body and gasket. Refer to Throttle Body Assembly Removal (67. Throttle Body Removal).
5. Clean the intake manifold in solvent.
Warning: Refer to Safety Glasses and Compressed Air Warning (Safety Glasses and Compressed Air Warning).

6. Dry the intake manifold with compressed air.

Inspection Procedure

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.

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 gauge 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.