Positive Crankcase Ventilation: Testing and Inspection

View: PCV Valve:

1. Warm up the engine to normal operating temperature. Run engine at idle.
2. Pull valve from cylinder head cover, with ventilation hose attached, and verify vacuum is felt at valve opening, (port A).
3. Stop engine. Remove valve from hose.

View: Positive Crankcase Ventilation Valve:

4. Blow through valve from port A and verify air comes out port B.
5. Blow through port B and verify no air comes out Port A.
6. If not as specified, replace valve.