Originally Posted By: Scimmia
Originally Posted By: bepperb
"I was told to put a rubber glove ove the oil fill hole with the engine running and if it sucks the glove in that it means the PCV is working. If it inflates the golve it is not functioning. Is this correct? "
I would say no. The pressure in the crankcase is usually going to be positive so the glove will always blow out.
The PCV valve is a one way. Gas only goes out of the valve cover towards the intake manifold. It should only move when there is pressure from the valve cover side, not if there is only a vaccum from the intake side.
If you're in doubt, spend the three bucks to replace it.
The only situation I can think of where the glove would "blow out" at idle would be if both the inlet and outlet of the PCV system were blocked or you had very, very severe blow by, basically worst case scenario. Generally there should be very little pressure at all, the inlet is open to atmosphere, after all.
So in my case where the glove was sucked, is that normal? A good thing?