Component Tests

Overfill Limiter (Two Way Valve):

OVERFILL LIMITER

Remove the overfill limiter valve and blow gently through both ends. Air should pass through the valve in both directions with slight resistance.


PURGE CONTROL VALVE

1. With the engine warmed up to normal operating temperature and ignition key in the "OFF" position, remove the purge hose from the air cleaner and blow into it. Air should not flow through the purge control valve.
2. Start the engine and accelerate it to 2000 rpm. Blow into the hose and verify that air passes through the purge control valve.
3. If air will not pass check the operation of the thermo valve and its connecting vacuum hoses for breaks and obstructions.


PURGE CONTROL SOLENOID VALVE

Fig. 59 Testing the purge control valve:

1. Mark and disconnect the vacuum hose (black with red stripe) from the solenoid valve.
2. Disconnect the electrical harness connector.
3. Connect a manual vacuum pump to the nipple the red striped hose was removed from.

Testing The Purge Control Solenoid Valve, Powered:

4. Attempt to apply a vacuum while voltage is applied to the solenoid valve, verify that the valve does not hold vacuum.
5. Remove power from the solenoid valve and verify that the solenoid valve holds vacuum.

Resistance Testing The Purge Control Solenoid Valve:

6. Measure the resistance between the two terminals of the solenoid valve, and verify that the resistance is between 36 and 44 ohms at 20 degrees C (68 degrees F).