56. Intake Manifold Cleaning and Inspection - Upper

Intake Manifold Cleaning and Inspection (Upper)

Important: Do not reuse the upper intake manifold-to-lower intake manifold sealing gaskets.


1. Remove and discard the upper intake manifold-to-lower intake manifold gaskets.




2. Remove and discard the throttle body gasket.
3. Clean the upper intake manifold in an approved solvent.

* Clean the upper intake manifold gasket sealing surfaces.
* Clean all engine coolant passages of scale build up.
* Clean all carbon from the EGR passages.
* Clean all upper intake manifold ports.
* Inspect upper intake manifold sealing surfaces for nicks and cracks.

Caution: Wear safety glasses in order to avoid eye damage.

* Dry the upper intake manifold with compressed air.