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.

Intake Manifold Cleaning and Inspection Lower

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

1. Inspect the sealing grommet on the MAP sensor. The grommet should not be torn or damaged.
2. Remove and discard the lower intake manifold-to-cylinder head gaskets.
3. Clean the lower intake manifold in an approved solvent.

•	Clean the lower intake manifold gasket sealing surfaces.

•	Clean all engine coolant passages of scale build up.

•	Clean all carbon from the EGR passages.

•	Clean all lower intake manifold ports.

•	Inspect lower intake manifold sealing surfaces for nicks and cracks.

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

•	Dry the lower intake manifold with compressed air.