D150 1/2 Ton Pickup 2WD V8-318 5.2L VIN R 4-bbl (1982)
Air Injection Control Valve: Testing and Inspection
Air Switching Valve
Failure of the air switching valve is indicated when the valve receives a vacuum signal, but does not shut off air to the downstream injection point.
This valve is not serviceable and must be replaced if defective.