A PCV Valve ("Positive Crankcase Ventilation Valve") is the key to the the Crankcase Ventilation System and plays a critical role to an engine running smoothly. Without a PCV Valve, there is no way for an engine to release its internal pressures which can cause premature seal failure.
Some signs that you may need to replace your PCV Valve are:
- Gasket failure
- A clicking sound when the engine is running