The manual says that air should not blow through both ends of a new PCV valve you took it back to the parts store and they say Which is right?
The correct statement is: Air should not blow through both ends of a new PCV valve.
A properly functioning PCV valve should allow air to flow in one direction only - from the crankcase to the intake manifold. If air can blow through both ends, it indicates a faulty PCV valve that needs to be replaced.
