Pathfinder LE 4WD V6-3.3L (VG33E) (1997)
Positive Crankcase Ventilation Valve: Testing and Inspection
PCV (Positive Crankcase Ventilation) VALVE
With engine running at idle, remove PCV hose from PCV valve; if the valve is working properly, a hissing noise will be heard as air passes through it
and a strong vacuum should be felt immediately when a finger is placed over valve inlet.