PCV System: Operation

During idling and slow speed operation, crankcase gases are drawn into combustion chamber through a flame guard and PCV valve on 4-cylinder models or through an oil filter cap and PCV valves on 6-cylinder models.

During high speed or full throttle operation, crankcase gases are drawn through hose to intake manifold and excess gases are drawn through hose to air cleaner. On Turbo models, crankcase gases are drawn through hose to turbo-compressor intake.

On Turbo Diesel models the oil separator valve is connected to the intake side of the turbocharger. The valve is controlled by intake pressure. If intake pressure drops too low, the valve closes to prevent excessive oil consumption. SeeFigure .