Gasoline Models
Crankcase ventilation system is designed to direct blow-by gases into intake manifold to be burned by engine. System is a closed type and consists of positive crankcase ventilation (PCV) valve and connecting hoses. System supplies fresh air to crankcase through air cleaner.
Under normal driving conditions, fresh air is mixed with blow-by gases (inside crankcase) and flow through PCV valve into intake manifold. Under heavy acceleration or high-speed driving, intake manifold vacuum decreases and blow-by gases exceed PCV valve capacity. Gases are then routed through breather hose into air cleaner and carburetor to be burned by the engine.