Positive Crankcase Ventilation: Testing and Inspection

RESULTS OF INCORRECT OPERATION

A plugged valve or hose may cause:

^ Rough idle
^ Stalling or slow idle speed
^ Oil leaks
^ Oil in air cleaner
^ Sludge in engine

A leaking valve or hose would cause:

^ Rough idle
^ Stalling
^ High idle speed

Checking PCV Vacuum:

PCV VALVE

1. Remove PCV valve from engine.
2. Run engine at idle
3. Place your finger over the end of the PCV valve to check for vacuum. If there is no vacuum, check for clogged valve. Replace as necessary.

NOTE: If engine is idling rough, this may be caused by a clogged PCV valve or plugged hoses; therefore, never adjust idle speed without first checking PCV valve and hoses.