Positive Crankcase Ventilation Valve: Testing and Inspection

PCV Valve And Ventilation Hose

Inspection
1. Warm up engine to normal operating temperature and run engine at idle.
2. Remove PCV valve from cylinder head cover by pulling ventilation hose.




3. Block PCV opening.
4. Verify that vacuum is felt.
5. Remove PCV valve from ventilation hose.
6. Blow low pressure air through larger diameter inlet. Air should pass through valve.
7. Blow low pressure air through smaller inlet of PCV valve. Air should not pass through valve.
8. Replace PCV valve if PCV valve fails any of these tests.