Positive Crankcase Ventilation: Testing and Inspection

1. Check the crankcase ventilation hoses and connections for leaks, cracks, or clogging, Fig. 119.
2. Start the engine and let it idle.

Fig. 120 Pinching Off PCV Hose:

3. Lightly pinch the breather hose between the PCV valve and intake manifold, Fig. 120. There should be a clicking sound from the PCV valve. If there is no sound, replace the valve and re-test.