Hyundai Elantra: Repair procedures - Crankcase Emission Control System - Emission Control System - Hyundai Elantra HD 2006–2010 Service ManualHyundai Elantra: Repair procedures


Disconnect the ventilation hose from the positive crankcase ventilation (PCV) valve. Remove the PCV valve from the rocker cover and reconnect it to the ventilation hose.
Run the engine at idle and put a finger on the open end of the PCV valve and make sure that intake manifold vacuum can be felt.
The plunger inside the PCV valve will move back and forth.

    Positive Crankcase Ventilation (PCV) Valve. Description and Operation
    Operation Engine condition Not running Engine condition Idling or decelerating PCV valve ...