63. Lower Intake Manifold Cleaning and Inspection

Lower Intake Manifold Cleaning and Inspection




1. Clean the intake manifold gasket mating surfaces (3) using GM P/N 12346139 (Canadian P/N 10953463) or equivalent.
2. Clean the fuel injector bores (1).
3. Inspect the lower intake manifold locating pins (2) for damage. Replace as necessary.
4. Inspect the intake manifold for damage.

Important: If replacing the lower intake manifold, make sure to transfer or replace the locating pins as necessary.


5. Repair or replace the intake manifold as necessary.