Positive Crankcase Ventilation: Testing and Inspection

PCV System Test:

1. Check the crankcase ventilation hoses and connections for leaks and clogging.

PCV Testing:

2. At idle, make sure there is a clicking sound from the PCV valve when you lightly pinch the PCV hose with your fingers or pliers.
If no clicking sound is heard, replace the PCV valve and recheck.