50. Intake Manifold Clean and Inspect
Intake Manifold Cleaning and InspectionImportant: Do not reuse the lower intake manifold gaskets or end seals.
1. Clean the intake manifold in an approved solvent.
- Clean debris out of all bolt holes. Clean the intake manifold gasket sealing surfaces.
- Clean all carbon from the EGR passages.
- Clean all intake manifold ports.
Caution: Refer to Safety Glasses Caution in Service Precautions.
2. Dry the intake manifold with compressed air.
3. Inspect the following:
- The intake manifold bolt holes (1) for cracks and/or damage.
- The MAP sensor sealing surface (2) for damage.
- The purge solenoid sealing surface (4) for damage. The purge solenoid bolt has a sealer that may come off during removal of the bolt. Ensure all sealant is removed from the bolt hole.
- The intake manifold-to-cylinder head sealing surfaces (3) for damage.
- The EGR adapter mounting surface for damage.
- The throttle body studs (5) for damage.
Replace as necessary.
- The throttle body mounting surface (6) for damage.
- The oil fill tube hole (7) for signs of leakage.
Reseal as necessary.
- PCV port (8) for debris or varnish buildup.
- EGR pipe for damage.