Q: What is the Positive Crankcase Ventilation (PCV) System and PCV Valve?
A: The Positive Crankcase Ventilation (PCV) system lessens hydrocarbon emissions by scavenging crankcase vapors. It contains the PCV valve and two hoses. One hose connects the air filter housing to the valve cover, and the other connects the valve cover to the intake manifold. The PCV valve halts the flow when the intake manifold vacuum is high.