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Home >> Mazda >> 1995 >> B2300 4WD L4-2.3L VIN A >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Description and Operation >> Sub-System Description >> Positive Crankcase Ventilation (PCV) System
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Positive Crankcase Ventilation (PCV) System

DESCRIPTION
The PCV valve is operated by the intake manifold vacuum. When the engine is running at idle, PCV valve is slightly open and a small amount of blowby gas is drawn into the upper intake manifold to be reburned. As the engine speed rises, the PCV valve is opened further, allowing a larger amount of blowby gas to be drawn into the upper intake manifold.
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