Positive Crankcase Ventilation: Service and Repair

An engine which is operated without any crankcase ventilation can be damaged. Periodically, inspect the PCV, hoses and clamps and replace any showing signs of deterioration.

PCV VALVE TESTING
1. Remove PCV valve from valve cover but leave attached to hose.
2. Start engine and run at idle.
3. Check for vacuum at the valve by placing a finger over the open end. Strong vacuum should be present.
4. If there is no vacuum, stop engine and check for plugged hose, manifold port or PCV valve.
5. Inspect PCV valve metered orifice and clean or replace valve as required. Shake valve and listen for rattle. Replace valve if it does not rattle. Replace hose if defective.
6. Clean manifold port if needed.