Positive Crankcase Ventilation: Testing and Inspection

WARNING: Do not suck air through PCV valve. Petroleum substances inside the valve and fuel are harmful.


PCV HOSE INSPECTION
- Check hoses for connection, leakage, clog, and deterioration. Replace as necessary.


PCV VALVE INSPECTION

Inspecting For Vacuum:

- Disconnect PCV hose from PCV valve.
- Run engine at idle.
- Place your finger over end of PCV valve to check for vacuum. If there is no vacuum, check for clogged valve. Replace as necessary.
- After checking vacuum, stop engine and check PCV valve for sticking.

Inspecting PCV Valve For Sticking:

- With engine stopped, connect a new hose to PCV valve for inspection.
- Blow air into the hose and check that air flows with difficulty from cylinder head side to intake manifold side. If air flows without difficulty, valve is stuck in "Open" position. Replace PCV valve.
- After removing the hose, connect PCV hose.