Description & Operation

The crankcase ventilation system is designed to control the flow of crankcase gas and vapors into the intake manifold to be burned by the engine rather than being discharge into the atmosphere. System is a closed type and consists of a positive crankcase ventilation (PCV) valve, 3-way joint, and connecting hoses.

Under normal driving conditions, intake manifold vacuum is high and the PCV valve opening is limited. The amount of blow-by gas drawn into the intake manifold is small.

Under heavy acceleration or high-speed driving, intake manifold vacuum decreases and the PCV valve is wide open due to its spring force. In this case, a large amount of blow-by gas is drawn into the intake manifold.