The PCV system ensures that crankcase gases are discharged through a special valve via a hose back into the intake manifold, from where they enter the combustion chambers and are burned during normal engine operation. The system consists of a hose running from the cylinder head cover to the intake manifold and a fresh air supply hose laid between the air cleaner and the cylinder head cover.
The PCV valve with a hose attached to it is located in the intake manifold under the fuel line, or is located at the rear of the engine, depending on the model (see illustrations below).
 |
 |
1. With the engine idling and at normal operating temperature, pull the valve and remove it, along with the attached hose, from the intake manifold or hose.
2. Place your finger against the hole in the PCV valve or hose (see accompanying illustration) – a vacuum should be felt, otherwise check the patency of the hose, the fitting on the intake manifold and the valve itself. Replace the defective components. 3. Turn off the engine and shake the PCV valve – it should rattle slightly, otherwise replace it.
4. To replace the PCV valve, disconnect it from the vacuum hose, remembering the connection direction.
5. When purchasing a new valve, make sure that it matches the size of your car's engine. The best way is to directly compare the new valve with the old one removed from the engine.
6. Connect the replacement PCV valve to the vacuum hose, making sure they are securely connected.
7. Check the condition of the hoses and rubber bushings. Replace any defective components.
8. Firmly seat the valve in its original place. For more detailed information on the operation of the PCV system, see Chapter Engine management systems of this Guide.