Positive Crankcase Ventilation: Testing and Inspection

PCV System Test

PCV Valve





1. Check the crankcase ventilation hoses and connections for leaks, cracks or clogging.
2. Start the engine and allow it to idle.





3. Lightly pinch the breather hose between the PCV valve and intake manifold, with your fingers or pliers.

There should be a clicking sound from the PCV valve.

- If no sound is heard, replace the PCV valve and retest.





Blow-by Filter
Inspect the condition of the blow-by filter.
- Replace the filter in the following instances:
- When the filter is stuck fast and oil is dripping or seeping through.
- When the filter is covered with dust and dirt so that clogging is evident.