54. Intake Manifold Clean and Inspect

Intake Manifold Cleaning and Inspection





Caution: Refer to Safety Glasses Caution in Service Precautions.

1. Clean the upper intake manifold in cleaning solvent.
2. Dry the upper intake manifold with compressed air.





3. Clean the lower intake manifold in cleaning solvent.
4. Dry the lower intake manifold with compressed air.





5. Inspect the upper intake manifold for the following:
- Cracks or other damage to the exterior (1)
- Cracking or damage in the gasket grooves (2) and (3)
- Damage to the throttle body mounting surface (4)
- Loose or damaged bolt hole thread inserts (5)





6. Inspect the lower intake manifold for the following:
- Damage to the gasket sealing surfaces (1), (2) and (3)
- Restricted exhaust gas recirculation (EGR) system passages (4)
- Restricted cooling system passages (5)
- Cracks or damage
- Damage to the threaded bolt holes