Inspection and Cleaning

1. The following materials are required for the cleaning procedure:

- A 1/2 to 1-inch wire stemmed horse hair or nylon bottle cleaner type brush.

- Carburetor Tune-Up Cleaner D9AZ-19579-AA or equivalent meeting Ford specification ESR-M14P9-A.

NOTE: Do not use choke cleaner solvents.

- rubber gloves.

- eye protection.

2. Remove lower intake manifold.

3. Disconnect the vacuum control linkage rods from the plastic bushings and levers and verify that the shaft assembly is causing the stick/bind/grab condition. If the vacuum motor and valve assembly is causing the sticking condition, replace the vacuum motor and valve assembly.

4. Holding the lower intake manifold vertical, liberally spray the cleaner into each of the bores concentrating the spray at each shaft/journal interface. Spray from both the top and bottom side of the bore, rotating the shaft by hand and pushing end-to-end to work the cleaner into the journal areas. Soak assemblies for 15 minutes.

Intake Manifold Runner Control (IMRC) Assembly:

5. Saturate the cleaning brush with solvent and scrub between the bores and valve plates. Apply some pressure on the brush while scrubbing, concentrating on the area where the shaft meets the housing journal.

6. Spray cleaner on the bores, plates, and shaft as needed to wash away any residue,

7. Use shop air to blow away the remaining residue. Concentrate on blowing the residue out of the shaft/journal area.

8. The shaft should now rotate freely without sticking or binding.

NOTE: If the lower intake manifold has been properly cleaned following the above procedure and the plates still do not rotate freely, replace complete lower intake manifold.

9. Re-install the vacuum control linkage rods using new plastic bushing.

NOTE: If plates do not rotate freely in response to vacuum signal, replace the complete lower intake manifold.

10. Apply 10 in Hg vacuum to the vacuum motor and valve assembly inlet port and verify the valve plates rotate to the closed position. Release vacuum. Plates should rotate quickly and freely to the open position. Repeat several times to verify freedom of movement.