62. 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 (714). Refer to Intake Manifold Removal (RPO LY2/LY6/L92) (Overhaul)Intake Manifold Removal (RPO LC9/LY5/LMG/L76) (Overhaul) .
3. Remove the evaporative emission (EVAP) canister purge solenoid valve, EVAP tubes, and fuel rail with injectors. Refer to Fuel Rail and Injectors Removal (Overhaul) .
4. Remove the throttle body and gasket. Refer to Throttle Body Removal (Overhaul) .
5. Clean the intake manifold (500) in solvent.
Caution: Refer to Safety Glasses and Compressed Air Caution .
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 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.