Can I plug off my PCV valve?
Can I plug off my PCV valve? Re: plugging the pcv valve (spaceman) It is designed to open (spring loaded) once oil vapor pressure is maxxed. The oil vapors are then directed to your intake manifold where they are combusted. You would NEVER want to plug the PCV valve. I recommend replacing the PCV valve yearly. Why is my PCV sucking oil into the intake? Probably due to the oil galley filling up with oil, but the seperator was not able to keep the oil out of the intake. I swaped to a larger 351 lightning PCV & that made...