Positive Crankcase Ventilation: Description and Operation

Crankcase Ventilation System Description
A closed crankcase ventilation system is used in order to provide a more complete scavenging of crankcase vapors. Fresh air from the throttle body is supplied to the crankcase, mixed with blow-by gases, and then passed through a crankcase ventilation pipe/passage into the intake manifold.

Results of Incorrect Operation A plugged PCV Pipe/passage way may cause:
- Rough idle
- Stalling or slow idle speed
- Oil leaks
- Sludge in engine