Originally Posted by cross><hair
The idler pulley was replaced I believe, w/ the one from the ASP 178 kit. How do you check it out? What do I look for?
When you started hearing that high pitched sound when did you hear it, at idle or at a certain rpm like me?
PS It won't make that noise in Park regardless of RPM, only: 1. While in drive 2. With moderate throttle input and 3. Between the aforementioned rpm ranges.
Thats exactly what I was describing as well.... if you have a stock air box to toss on, The sound may go away. I honestly think it has something to do with part throttle boost passing by the throttle actuator and the NW CAI.