• | Clean the intake manifold gasket grooves. |
• | Clean the intake manifold vacuum passages at the rear of the intake. |
Caution: Wear safety glasses in order to avoid eye damage.
Important: The rear manifold absolute pressure (MAP) sensor housing is retained to the intake manifold by push-in-place snap lock design.
The rear MAP sensor housing is sealed at the intake manifold by an O-ring seal.• | Inspect for damaged or broken vacuum fittings, damaged MAP sensor mounting bore, or broken MAP sensor retaining tab. |
• | Inspect the rear MAP sensor housing for looseness or poor sealing to the intake manifold. Repair or replace the components as necessary. |
Inspect the areas between the intake runners.
8.1. | Locate a straight edge across the intake manifold cylinder head deck surface. |
8.2. | Insert a feeler gauge between the intake manifold and the straight edge. |
A intake manifold with warpage in excess of 0.5 mm (0.02 in), must be replaced.