B4000 4WD V6-4.0L OHV (1995)
Positive Crankcase Ventilation Valve: Testing and Inspection
Note: Perform this inspection while the engine is cold.
INSPECTION
1. Run the engine at idle.
2. Disconnect the PCV valve along with the ventilation hose from the cylinder head cover.
3. Block the PCV valve opening.
4. Verify that vacuum is felt.
5. Remove the PCV valve.
PCV Valve
6. Blow through the valve from port A and verify that air comes out of port B.
7. Blow through the valve from port B and verify that no air comes out of port A.
8. Replace the PCV valve if not as specified.