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Vacuum Solenoid Valve Test

  1. With engine at normal operating temperature, engine idling and transmission in neutral, make sure choke plate is fully open.
  2. Turn off air conditioner, power take-off (if equipped), and all accessories. Disconnect vacuum supply hose at solenoid valve and check for vacuum. If no vacuum is present, clean or replace hose as required.
  3. If a vacuum delay valve is used, remove valve and install a straight connector. Disconnect wires to solenoid valve. With a jumper wire, apply battery voltage to one of the solenoid terminals. The engine speed should not increase. If it does, replace the solenoid valve.
  4. With battery voltage on one terminal, use a second jumper wire to ground the other terminal of the valve. The engine speed should increase, if not, replace the valve.
  5. Remove the ground jumper wire. The engine should return to idle within 15 seconds. If not, replace the solenoid valve.
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