Air Control Solenoid Valve
- With engine warm and idling, disconnect neutral switch.
- Check voltage on air control solenoid valve Yellow/Blue wire terminal. Below 1160 RPM, reading should be 0-1.5 volts. Above 2500 RPM, voltmeter should read 12-14 volts. If voltage is not correct at 2500 RPM, check voltage supply from ignition switch to Black/White solenoid wire terminal.
- Disconnect vacuum hoses from solenoid valve. Blow through port "A" of the solenoid and confirm that air bleeds from port "C" at bottom of valve. See Fig 1
.
- Briefly apply battery voltage and ground to solenoid valve terminals. Solenoid should click. Blow through port "A" of the solenoid valve and confirm that air bleeds off from port "B" when solenoid is energized.
Courtesy of FORD MOTOR CO.