1. The PCV system ensures the removal of crankcase gases 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 timing belt cover.
2. The PCV valve with a hose connected to it is seated in the cylinder head cover.
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3. With the engine idling and warmed up to normal operating temperature, pull the valve and remove it together with the connected cylinder head cover hose.
4. Press your finger against the hole in the PCV valve or hose - you should feel a vacuum, otherwise make sure the hose, the fitting on the intake manifold and the valve itself are clear. Replace defective components.
5. Turn off the engine and shake the PCV valve - it should rattle slightly, otherwise replace it.
6. To replace the PCV valve, disconnect it from the vacuum hose, noting the direction of installation.
7. 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 one removed from the engine.
8. Connect the replacement PCV valve to the vacuum hose, making sure it is connected securely.
9. Check the condition of the hoses and rubber bushings. Replace any defective components.
10. Firmly seat the valve in its original place. For more detailed information on the operation of the PCV system, see Chapter Engine management of this Guide.
The text was taken from the website HondaBook