What is the PCV (Positive Crankcase Ventilation) System?

The PCV system is setup to relieve pressure inside your crankcase. During combustion, pressure on the top side of your piston pushes combustion gasses, fuel and droplets of oil past the piston rings and into the crankcase. The combustion of air and fuel creates a mixture known as oil blow-by.

Oil blow-by can create horsepower robbing sludge build up that coats parts of your intake system and engine with excess oil and fuel.

To keep your crankcase from becoming pressurized, the blow-by is pulled out by the PCV system. The blow-by is routed through the intake manifold and sent into the combustion chamber to be burned off. An oil and fuel mixture going through your intake system doesn’t sound good at all, does it?