All engines are equipped with the Positive Crankcase Ventilation (PCV) system. The PCV system vents crankcase gases into the engine air intake where they are burned with the fuel and air mixture. The PCV system keeps pollutants from being released into the atmosphere. It also helps to keep the engine oil clean, by ridding the crankcase of moisture and corrosive fumes. The PCV system consists of the PCV valve, the nipple in the air intake and the connecting hoses.
| Fig. 1: Typical PCV system airflow
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| Fig. 2: The PCV valve can be found either threaded to
the valve cover . . .
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| Fig. 3: . . . or mounted in a grommet on the valve cover
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Incorrect operation of the PCV system can cause multiple driveability symptoms.
A plugged valve or hose may cause:
A leaking valve or hose would cause:
