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How to clean the PCV valve on our car

Model: (Various brands) Various
Part: Oil vapor hose

Video tutorial

In this video we see how to do maintenance on the PCV (Positive Crankcase Ventilation) valve, which is used to recover oil vapors: the blow-by effect (or blow-by gas) which is a typical phenomenon of internal combustion engines, where the combustion gases exit the combustion chamber towards the crankcase.

The PCV system draws them from the crankcase, sends them to the intake manifold to be burned in the engine, filters the oil through a separator, to prevent it from entering the intake.

The PCV valve must be kept clean, otherwise oil vapors cannot pass through. On this car the valve is made of rubber, but it can also be made of metal, and it is located at the top of the engine, with a sort of nozzle on the front which contains a spring, and we clean it with a carburetor cleaner.

Once cleaned, we put it back in place, reconnect the tubes, and we're done.


Posted on 19 June 2025 by ScegliAuto


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