Fd3BOOST

Three days ago my idle grew a surge. It usually sits at 1000k, So now it is surging back and forth between 1k and 1800k roughly. It is only at idle and sorta comes and goes but it is constantly there.Generally I have been able to get surges out in the past by backing out some fuel at idle. I haven't played with the idle set screw because I broke the top off mine and need to swap it out, I did however back some fuel out with my PMC and that didn't seem to affect the idle the way I needed it to. I have quicky glanced to make sure my caps and hoses are all where they should be. So aside from an idle screw asdjustment what could be the culprit. Keep in mind that this started out of the blue, no work was done that could prompt something like this. I'm reading if anyone has any input.

TIA

Dave

TYSON

Sounds like you have a vacuum leak Dave. What does your engine look like under the UIM? Remember there's a couple connections way down on the LIM under all the junk.

93 R1

buy a PFC



I'm gonna have to agree with Tyson on the vac leak

9BASE3

Dave,



Even I'll have to agree that it almost has to be a boost leak. I've never heard of idle issues with the PMS.. Check the TB to make sure it's tight. Although I don't think it was the cause, I found that the 4 12mm crowns on the TB had started to work themselves loose. I also found a small one at the boost controller. ..Just giving you a few ideas. Good luck boss!

Fd3BOOST

Justin, (Westminster J) I know, i know. The purple is old junk. I'm working on it.

Ok thanks for the suggestion, I will tear into it tonight after I get done working and find the leak.