PCV system is an acronym that stands for Positive Crankcase Ventilation. It reduces the emissions of hydrocarbons in the environment by drawing fresh air into the crankcase where it mixes with the blow-by gases. The PCV valve then pulls this mixture to the intake manifold. When these vapors flow, they are controlled by the PCV valve which helps maintain idle quality. Fresh air inlet hose in Acura and Honda models is used to draw fresh air into the crankcase from two places, that is, the air intake duct and valve cover. Check hoses for damage and inspect for vacuum at idle on PCV valve, as well as worn out PCV valve grommet when examining PCV system.