Positive Crankcase Ventilation: Testing and Inspection

PCV Valve Test
1. Check the crankcase ventilation hoses and connections for leaks, cracks or clogging.
2. Start the engine and allow it to idle.





3. Lightly pinch the breather hose between the PCV valve and intake manifold, with your fingers or pliers.
There should be a clicking sound from the PCV
- If no sound is heard, replace the PCV valve and retest.