58. Intake Manifold Clean and Inspect - 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.