Positive Crankcase Ventilation: Testing and Inspection

Fig. 98 PCV Breather Hoses:

1. Check the crankcase ventilation hoses and connections for leaks, cracks, or clogging, Fig. 98.
2. Start the engine and let it idle.

Fig. 99 PCV Valve "Pinch" Test:

3. Lightly pinch the PCV hose between the PCV valve and intake manifold, Fig. 99. There should be a clicking sound from the PCV valve. If there is no sound, replace the valve and re-test.