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Positive Crankcase Ventilation

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NOTE: Use this test to diagnose Positive Crankcase Ventilation (PCV) valve and related vacuum hoses only.

  1. 1) Stuck PCV Valve Check

    Ensure PCV valve maintenance schedule has been followed. Ensure proper PCV valve is installed. Remove PCV valve. Shake valve and listen for rattle. If PCV valve rattles when shaken, install PCV valve and go to next step. Replace PCV valve if it does not rattle when shaken. Verify repair.

  2. 2) PCV System Check

    Start engine and warm to normal operating temperature. Disconnect fresh air hose from remote air cleaner or outlet tube connecting MAF sensor to throttle body. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, go to next step. If vacuum from hose holds paper in place for one minute, PCV system is okay. Return to SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - GASOLINE & NGV article to complete testing.

  3. 3) Evaporative Emission System Check

    Disconnect evaporative emission hose from PCV system and plug connector. Again, place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, isolate vacuum leak or restriction in PCV system and repair as necessary. If vacuum from hose holds paper in place for one minute, PCV system is working properly at this time. Go to EVAPORATIVE EMISSION SYSTEM TESTS  to diagnose EVAP system vacuum leak.
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