Quote Originally Posted by cheatah faheatah View Post
anyone?
I have thought about this and have never come up with an answer other than the by installing the PCV the noise and vacuum stopped. I never really gave it anymore thought than that. I have also seen people leave out the O-ring, or have a completely clogged one and cause the same thing.
The PCV is located under the MAP at the passangers side of the intake manifold on top opposite the throttle body on NA engines and is under the 2 bolt cover on the drivers side rear of the supercharger near the throttle body on supercharged cars.

2. The noise is the seal in the balancer being pressed against the shaft and that's what causes the squealing.

3. Above.

4. Above.

I don't know how it causes it I have just seen it and it always led to the PCV issue. I would like to know an explaination to this as well because it causes a hell of a vacuum in the crank case when there is an issue as if the manifold vacuum was being applied to the crank case as well. That's the only explanation I have but I know the source of air is traveling out of the case and into the intake tube which is basically just where it's pulling filtered air after the MAF.

Jeff