The (PCV) system was developed to remove harmful vapors from the engine.
The (PCV) system does this by using manifold vacuum to draw vapors from the crankcase.
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The (PCV) Valve
So, The most critical part in the (PCV) system is the flow control valve. The common name for this part is the (PCV) valve. The purpose of the (PCV) valve is to meter the flow of vapor from the crankcase to the intake manifold. This is necessary in order to provide proper ventilation for the crankcase, while not upsetting the fuel/air mixture for combustion. Blow-by is minimal at idle and increases during high speed operation, The (PCV) valve must control the flow of vapor.
So, The (PCV) valve is designed to compensate for the engine ventilation needs at varying engine speeds. For example, at low or idle engine speeds manifold vacuum is high. This pulls the plunger to the extreme forward position, or manifold end of the valve. Vapor flow is reduce to a minimum, Due to the shape of the plunger. Consequently, The low rate of the flow is adequate for ventilation purposes and will not upset the fuel/air mixture ratio.
What Happens If You Neglect The (PCV) System
A neglected (PCV) system will soon fail to function and the result can be expensive as well as troublesome. If the crankcase is not adequately ventilated, the motor oil will become contaminated with heavy sludge accumulations. Finally, Internal parts, not protected by the motor oil, will begin to rust and/or corrode.
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