Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Air Injection Control Valve: Testing and Inspection
Air Control Valve
Fig. 67 Standard air control valve. 1983---87
Standard Air Control Valve
1.
Run engine at 1500 RPM and disconnect air supply hose at inlet, Fig. 67. There should be air flow at hose. Reconnect air supply hose at valve
inlet.
2.
Disconnect air supply hoses at outlets A and B and the vacuum line at the vacuum nipple.
3.
Run engine at 1500 RPM. There should be air flow at outlet B but little or no air flow at outlet A.
4.
Run engine at 1500 RPM and connect a direct vacuum line from any manifold vacuum fitting to air control valve vacuum nipple. There should be
air flow at outlet A but little or no air flow at outlet B.
5.
Connect all vacuum hoses at original positions. If valve does not function correctly, replace valve.
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.
