Positive Crankcase Ventilation Valve: Testing and Inspection

Fresh Air Hose Location:

NOTE: Perform both checks if there is a problem suspected in the PCV system.

With Engine Idling, Check for Vacuum at Valve

1. Remove PCV valve from attaching point, a hissing sound should be heard.
2. Place a finger over the inlet of the valve, a strong vacuum should be felt.
3. Proceed to next test.

With Engine Off, Check for Valve Movement

1. Remove and shake the PCV valve, a rattling noise should be heard, (valve is not stuck).

DIAGNOSIS

- If A strong vacuum is felt and the PCV valve rattles, the system is operating properly and no further testing is necessary.

- If no vacuum is felt and the PCV valve rattles, then the intake plenum and/or the crankcase vent hoses need to be cleaned or replaced. (Do not attempt to clean valve).

- If PCV valve does not rattle when shook, replace valve. (Do not attempt to clean valve).