Positive Crankcase Ventilation Valve: Testing and Inspection

Fig. 149 PCV:

1. Warm up the engine to the normal operating temperature and run it at idle.
2. Disconnect the PCV valve together with the ventilation hose from the cylinder head cover.
3. Block the valve opening and verify that vacuum is felt.

Fig. 150 PCV Test:

4. Remove the PCV valve.
5. Blow through the valve from port "A" and verify that air comes out of port "B".
6. Blow through the valve from port "B" and verify that air doesn't come out of port "A".
7. Replace the PCV valve if necessary.