Positive Crankcase Ventilation: Testing and Inspection

INSPECTION

PCV Hose, Breather Pipe And Valve:

1. Check the crankcase ventilation hoses and connections for leaks, cracks, or clogging.
2. Start the engine and let it idle.

PCV Testing:

3. Lightly pinch the Positive Crankcase Ventilation (PCV) hose between the PCV valve and intake manifold. There should be a clicking sound from the PCV valve. If there is no sound, replace the valve and re-test.