Positive Crankcase Ventilation Valve: Testing and Inspection

Description:

PCV VALVE CHECK
^ Run engine at idle.
^ Place your finger over the end of the PCV valve to check for vacuum. If there is no vacuum, check for clogged valve. Replace as necessary.

NOTICE: If engine is idling rough, this may be caused by a clogged PCV valve or plugged hoses; therefore, never adjust idle speed without first checking PCV valve and hoses.

^ Remove PCV valve from [1][2]PCV hose. Shake PCV valve and listen for a rattle. If valve does not rattle, replace PCV valve.