Positive Crankcase Ventilation: Testing and Inspection

1. After disconnecting the ventilation hose from the positive crankcase ventilation valve, disconnect the positive crankcase ventilation valve from the rocker cover, and reconnect the positive crankcase ventilation valve to the ventilation hose.
2. Idle engine, put finger on the opening end of the positive crankcase ventilation valve, and check that the negative pressure of the intake manifold is felt with finger.

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

3. If negative pressure is not felt, clean or replace the positive crankcase ventilation valve.