POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM

F-117prose procedure

DESCRIPTION

The PCV valve is operated by the intake manifold vacuum.

When the engine is running at idle the PCV valve is opened slightly and a small amount of blowby gas is drawn into the dynamic chamber to be burned.

At higher engine speeds the PCV valve is opened further, allowing a larger amount of blowby gas to be drawn into the dynamic chamber.

1
Warm up the engine to the normal operating temperature and run it at idle.
2
Disconnect the PCV valve together with the ventilation hose from the cylinder head cover.
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3
Block the PCV valve opening.
4
Verify that vacuum is felt.
5
Remove the PCV valve.
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6
Blow through the valve from port A and verify that air comes out of port B.
7
Blow through the valve from port B and verify that no air comes out of port A.
8
Replace the PCV valve if necessary.