Frontier 2WD L4-2.5L (QR25DE) (2005)
Positive Crankcase Ventilation Valve: Testing and Inspection
Component Inspection
PCV (POSITIVE CRANKCASE VENTILATION) VALVE
With engine running at idle, remove PCV valve from rocker cover. A properly working valve makes a hissing noise as air passes through it. A strong
vacuum should be felt immediately when a finger is placed over valve inlet.