D21 Hardbody 2WD V6-2960cc 3.0L SOHC MFI (VG30E) (1991)
Positive Crankcase Ventilation Valve: Testing and Inspection
PCV (Positive Crankcase Ventilation)
With engine running at idle, remove ventilation hose from PCV valve; if 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.