How to Determine if the PCV Valve is Damaged?

1 Answers
OCody
07/29/25 11:57am
Methods to determine if the PCV valve is damaged: 1. Let the engine idle, remove the PCV valve from the cylinder cover hose, then check if the PCV valve is clogged. Place your hand on the PCV valve interface, and you should feel a strong vacuum suction; 2. After reinstalling the PCV valve, remove the crankcase intake pipe from the air filter, then cover the pipe opening with a thin piece of paper. As the pressure in the crankcase decreases, the paper should be visibly sucked towards the pipe opening. After the engine stops running, remove the PCV valve and shake it by hand to check. If you hear a clicking sound, it indicates that the PCV valve is flexible and usable.
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