How does the PCV System work?

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PCV System Working:

The major component within the PCV system is that the PCV valve, an easy spring-loaded valve with a sliding pintle inside. The pintle is tapered sort of a bullet so it’ll increase or decrease airflow betting on its position inside the valve housing. The movement of the pintle up and down changes the orifice opening to manage the degree of air passing through the PCV valve.

The PCV valve is usually located in an exceeding valve cover or the intake valley and frequently fits into a rubber grommet. The placement of the valve allows it to drag vapors from inside the engine without sucking oil from the crankcase (baffles inside the valve cover or valley cover deflect and help separate droplets of oil from the blowby vapors).

A hose connects the highest of the PCV valve to a vacuum port on the throttle body, carburetor, or manifold. This enables the vapors to be siphoned directly into the engine without gumming up the throttle body or carburetor.

Because the PCV system pulls air and blowby gases into the manifold, it’s the identical effect on the air/fuel mixture as a vacuum leak. This is often compensated for by the calibration of the carburetor or mechanical system. Consequently, the PCV system has no net effect on fuel economy, emissions, or engine performance — provided everything is functioning correctly.



Removing or disconnecting the PCV system in a shot to enhance engine performance gains nothing, and is illegitimate. EPA rules prohibit tampering with any emission control device. Disabling or disconnecting the PCV system may allow moisture to accumulate within the crankcase, which is able to reduce oil life and promote the formation of engine-damaging sludge.

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