Positive Crankcase Ventilation Valve: Testing and Inspection

Description:

1. Remove the PCV valve from the intake manifold.
2. Start the engine.
3. Run the engine at idle.
4. Place your thumb over the end of the PCV valve to check for vacuum. Check for a plugged intake manifold port, PCV valve or vacuum hoses, if there is no vacuum at the PCV valve. Repair or replace as necessary.
5. Turn OFF the ignition.
6. Remove the PCV valve.
7. Shake the PCV valve while listening for the rattle of the needle inside. Replace the PCV valve if the valve does not rattle.

NOTES:
- Engine blow-by gas in excess of the PCV system capacity (from a badly worn engine, sustained heavy load, etc.) is exhausted into the air cleaner and is drawn into the engine.

- Proper operation of the PCV system is dependent upon a sealed engine. Check that the PCV system is functioning properly, if the build up of oil sludge or oil dilution is found. Check the engine for possible causes and correct, in order to ensure that the system will function as intended.