Positive Crankcase Ventilation: Testing and Inspection

The crankcase ventilation system must be kept clean to maintain good engine performance.

Periodic servicing is required to remove combustion products from the PCV valve.
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 on the open end of PCV valve and ensure that intake manifold vacuum can be felt.


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




3. If no vacuum is felt, replace the PCV valve and clean the ventilation hose using cleaning solvent or replace if necessary.