Pcv Valve Question?

[Samgrainger32]

Ok so a big question about my car I have always wanted to know but the old owner (good friend) never new ether as it was like it when he got it.. The pcv valves I believe that's what they are called the 2 on top of the motor are joined together with a hose and run to a catch can just like normal I thought but of one of the pcv valves (the one closest to the Intake plenum has another hose coming off of it that has been blocked and another hose that come from the plenum that has been blocked I have looked at heaps of picture of other rb20det motors and they all seem to have the hose conected so my question is WHY!! Why would some one block this hose off any help please

[Hanaldo]

Is your catch can venting to atmosphere? If so, then your setup sounds correct. If the catch can is venting to atmosphere, the PCV valve NEEDS to be blocked, otherwise the catch can is a massive air leak at idle. If the catch can is not venting to atmo, then there is no need to block the PCV unless it is stuffed.

[Samgrainger32]

Ok well the catch can just has the one hose leading to it from the pcv valve and just a little air cleaner thing on top so I'm guessing it's set up right?

[mad082]

There is only one pcv. It is in the drivers side rocker cover and a house runs from it to the plenum. The other hoses are simply breather hoses

[Samgrainger32]

Ok so y would this hose be blocked?

[Hanaldo]

Ok so y would this hose be blocked?

Here you go:

Is your catch can venting to atmosphere? If so, then your setup sounds correct. If the catch can is venting to atmosphere, the PCV valve NEEDS to be blocked, otherwise the catch can is a massive air leak at idle. If the catch can is not venting to atmo, then there is no need to block the PCV unless it is stuffed.

And in case you're still unsure:

If the catch can is venting to atmosphere, the PCV valve NEEDS to be blocked, otherwise the catch can is a massive air leak at idle.

Edited May 22, 2012 by Hanaldo