Originally Posted by b7a4GT30
A failed PCV valve should make it EASIER to take the oil cap off. But I've learned thats generally not a foolproof sign its the PCV, there can be a number of reasons that the block isn't under sufficient vaccum at idle to suck the oil cap down a little bit.
It could be the PCV, and that's honestly the likeliest culprit, but it could also be a failed check valve somewhere in the vacuum system or the Suction Jet Pump.
Heres a link for some of the PCV breather hose info: http://www.audizine.com/forum/showth...=1#post6016725
They often snap but since they're buried behind a bunch of stuff, its hard to spot...