Positive Crankcase Ventilation: Testing and Inspection

Systems Check
1. Remove the rocker cover side of the PCV valve hose.
2. Start the engine and run at idle.




3. Place a finger at the opening of the positive crankcase ventilation valve and confirm that vacuum of the intake manifold is felt.

NOTE: At this time, the plunger in the positive crankcase ventilation valve moves forward and backward.

4. If vacuum is not felt, replace the PCV valve.