Air Supply Control Valves

Standard air control valve. 1982:

Air control & shut off valve. 1982:

***UPDATED BY TSB# 90-6B-14

FUNCTIONAL CHECK

1. Verify that air flow is being supplied to the valve inlet by disconnecting the air supply hose at the inlet and verifying the presence of air flow with the engine at 1500 rpm. Figs. 67 and 68.
2. Disconnect the air supply hoses at outlets A and B.
3. Remove the vacuum line at the vacuum nipple.
4. Accelerate the engine to 1500 rpm. Air flow should be heard and felt at outlet B with little or no air flow at outlet A.
5. With the engine at 1500 rpm, connect a direct vacuum line from any manifold vacuum fitting to the air control valve vacuum nipple. Air flow should be heard and felt at outlet A with little or no air flow at outlet B.
6. If the valve is the bleed type, less air will flow from outlet A or B, and the main discharge will change when vacuum is applied to the vacuum nipple.
7a. If the above conditions are met and a Ford Authorized Decal states that the emissions control system has been modified and timing has been set to seven (7) degrees BTDC, then testing is complete. Restore all connections. A vacuum retard delay valve that was installed as part of the modification can produce an Engine Running Code 45 under normal operating conditions.
7b. If the above conditions are not met, replace the air control valve and restore all connections.


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.