300ZX Coupe V6-2960cc DOHC (VG30DE) (1994)
Positive Crankcase Ventilation Valve: Testing and Inspection
With engine running at idle, remove ventilation hose from Positive Crankcase Ventilation (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.