Air Injection Control Valve: Testing and Inspection

Air Control/Shut-Off Valve

1. Start engine and run at idle, disconnect vacuum supply hose from vacuum nipple, and disconnect inlet hose from valve. Suction should be felt at valve opening.
2. Apply manifold vacuum to vacuum nipple. No suction should be felt at valve inlet opening.

Fig. 60 Air control & shut off valve with orifice:

Air Control/Shut-Off Valve With Orifice

1. Disconnect valve inlet supply hose and ensure that there is air flow to valve inlet, Fig. 60, then reconnect air supply hose.
2. Run engine at 1500 RPM and disconnect air supply hose at valve outlet and the vacuum hose at vacuum nipple. There should be air flow at valve outlet.
3. Connect a direct vacuum line from any manifold fitting to valve vacuum nipple. There should be a noticeable increase in air flow at valve outlet.
4. Connect all vacuum hoses at original positions.