Since going to the track this past Thursday my car will not idle for more than 30 seconds without dieing!!! I think this may be related to the issue I was/still am having with light throttle stumble. It doesn't stumble at idle, just suddenly dies then I can start it right back up. The car runs fine otherwise. I am definitely not losing HP, the car made some strong runs at the track.

I thought it may be the MSD 6AL I temporarily had on the car so I replaced it with my Digital 6 that I just got back from MSD and the problem is still there. I also cleaned the MAF and monitored my TPS voltage (seems normal) to see if I could fix the problem...no luck.

Car idles at about 550-575 (is this low???)

Could this be a vacuum issue or should I look elsewhere?

I am gonna check for a vacuum leak in the morning and maybe pull a couple plugs just to see if they are ok since the problem came about after a run on spray.

Let me know where I should go if I don't find a vacuum issue.

Thanks!

Eric

 

Nothing??? I would like to figure this out...you can also look at what others have said here: http://ubb.mfba.org/showthread.php?p=299541#post299541

Thanks,
Eric

 

I can't believe noone even has a suggestion...I am kinda lost here.

 

might be your IAC.. I got a idle issue right now and I can't find mine either...try cleaning your Throttle body and see where that goes..take yoru IAC off and clean it..might jsut be that..let me knwo what you find though..


Brad

 

Ok, so far I have:

Cleaned MAF...didn't help
Checked all vacuum connections and hoses...nothing
Checked and Cleaned IAC by hand and with car running...nada

Still have yet to pull and check plugs, but I really don't think that's it

Parts on my short list that may be causing this:
IAC...maybe it's just bad and cleaning was useless
ICM
MAF
Opti

I am going to borrow the IAC, ICM, and MAF off my brother's or friend's cars and see if I can find the culprit. I also have new NGK TR6s that will probably be going onto the car regardless of if the plugs in there look bad or not.

It these don't turn up anything I will take the car to Speed Inc and see if they can find the problem.

If it's the OPTI the car will just get put away until I can get my 355 done. No sense in putting the time or money into an OPTI if I am taking the engine out in a few months anyway.

Eric

 

Stock idle for an A4 is 650 in park/neutral, 550 in drive. Warmed up of course. If you're not already, measure from the PCM as the tach is usually off by a little.

 

I am measuring off the PCM, through my Scanmaster.

I realized that the idle was ok as far as RPM goes.

Thanks,
Eric