56. Intake Manifold Cleaning and Inspection

Intake Manifold Cleaning and Inspection

Cleaning Procedure

1. Remove the fuel rail with injectors. Refer to Fuel Rail and Injectors Removal (Overhaul) .
2. Remove the evaporative emission hoses/pipes. Refer to Evaporative Emission Hoses/Pipes Replacement - Engine (Service and Repair) .
3. Remove the evaporative emission (EVAP) canister vent solenoid valve. Refer to PSD SIE TITLE Error: SIE linked to empty Cell ID 144782 .
4. Remove the throttle body and gasket. Refer to Throttle Body Removal (Overhaul) .
5. Clean the intake manifold in solvent.
Caution: Refer to Safety Glasses Caution (Safety Glasses Warning) .
6. Dry the intake manifold with compressed air.



Inspection Procedure

1. Inspect the manifold for the following conditions:

* Loose threaded inserts or studs.
* Damaged gasket or sealing surfaces.
* Damaged or broken vacuum fittings.
* 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 in) over a 200 mm (7.87 in) area is warped and should be replaced.