Positive Crankcase Ventilation: Testing and Inspection

The crankcase ventilation system must be kept clean to maintain good engine performance.
1. Disconnect the ventilation hose from the positive crankcase ventilation (PCV) valve. Then, remove PCV valve from the rocker cover and reconnect it to the ventilation hose.
2. Idle the engine and put a finger to the open end of PCV valve to make sure that intake manifold vacuum is felt on the finger.


NOTE: At this time the plunger inside the PCV valve should move back and forth.

3. If vacuum is not felt, replace the PCV valve and clean the ventilation hose in cleaning solvent or replace if necessary.