Positive Crankcase Ventilation: Testing and Inspection

Positive Crankcase Ventilation Valve:

PCV VALVE TEST

1. Remove PCV valve from valve cover.
2. Run the engine at idle.
3. Place your thumb over end of valve to check for vacuum. If there is no vacuum at valve, check for plugged hoses or manifold port, or PCV valve. Replace plugged or deteriorated hoses.
4. Turn the engine "OFF" and remove PCV valve, shake valve and listen for a rattle of the needle inside. If valve does not rattle, replace valve.