Cleaning Procedure
- Remove the fuel rail with injectors. Refer to
Fuel Rail and Injectors Removal.
- Remove the evaporative emission hoses/pipes. Refer to
Evaporative Emission Hoses/Pipes Replacement - Engine.
- Remove the evaporative emission (EVAP) canister vent solenoid valve. Refer
to
Evaporative Emission Canister Purge Solenoid Valve Replacement.
- Remove the throttle body and gasket. Refer to
Throttle Body Removal.
- Clean the intake manifold in solvent.
Caution: Refer to Safety Glasses Caution in the Preface section.
- Dry the intake manifold with compressed air.
Inspection Procedure
- 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. |
- 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 two 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.
