A clogged PCV valve can even be stuck in either the close or open position. When the PCV valve is stuck closed, this will result in excessive vacuum or pressure in the crankcase, which will cause oil to leak past seals and gaskets. When the PCV valve is stuck open, or when the air-...
In my experience, the vast majority of flow rate problems stem from incorrectly calibrated PCV valves. Consider this: OE valve suppliers may catalog as many as 750 part numbers. Your local fast-lube joint may carry as few as a dozen or two. To further complicate matters, as Mark Sarlo, a...
1. Remove the valve and shake it. If it rattles, it means the pintle inside is not stuck and the valve should flow air. But there's no way to know if the spring is weak or broken, or if a buildup of varnish and deposits inside the valve is restricting flow. 2. Check for vacuum...
A clogged PCV valve can even be stuck in either the close or open position. When the PCV valve is stuck closed, this will result in excessive vacuum or pressure in the crankcase, which will cause oil to leak past seals and gaskets. When the PCV valve is stuck open, or when the air-...