Rolling Idle
03-19-2008, 10:18 PM
#1
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Firstly, it's been a loooong time since I posted here. Unfortunately college has been keeping me more than busy (plus two jobs, a g/f, and college ice hockey). So naturally there just isn't much time to worry about the car right now. And for that I apologize.
Anyway, to my problem:
For a while now I have been having a rolling idle problem. When I took my car out of gear while moving, my rpms would roll and jump anywhere from 1500-2500. Once the car came to a stop the idle would usually stop rolling, but the idle would still be very high (around 1500). More recently the car still has the same problem while moving but when I come to a stop the idle settles to 1500 about half the time while the other half of the time the idle will continue to roll around 1800-2000 (at a quick pace with around 1/2 a second of time elapsing between the highs and lows of the idle roll). I'm not really sure what the cause may be. Oh an I forgot to mention that the car runs fine while in gear.
As some of you may know I am boosted. I tried to fix this problem numerous times by re-tuning, but to no avail. No matter what numbers I input to the smt6, my rolling issue still remains (unless of course I pull so much fuel out that the car struggles to maintain enough fuel to idle at all). I also have a small problem with my ecu. I broke one of the clips that holds it into place, so part of the ecu was never making connection which caused my car to not start. I took care of that problem with zip ties. It may still be a problem of loose wiring, but I really doubt it. And I don't believe that tuning is my problem, but I suppose there is a small chance that it is.
Anyway, if there are any ideas please fire away. I am really getting annoyed with this problem and I am absolutely certain that I will not pass inspection with this problem still occurring.
Thanks guys
Anyway, to my problem:
For a while now I have been having a rolling idle problem. When I took my car out of gear while moving, my rpms would roll and jump anywhere from 1500-2500. Once the car came to a stop the idle would usually stop rolling, but the idle would still be very high (around 1500). More recently the car still has the same problem while moving but when I come to a stop the idle settles to 1500 about half the time while the other half of the time the idle will continue to roll around 1800-2000 (at a quick pace with around 1/2 a second of time elapsing between the highs and lows of the idle roll). I'm not really sure what the cause may be. Oh an I forgot to mention that the car runs fine while in gear.
As some of you may know I am boosted. I tried to fix this problem numerous times by re-tuning, but to no avail. No matter what numbers I input to the smt6, my rolling issue still remains (unless of course I pull so much fuel out that the car struggles to maintain enough fuel to idle at all). I also have a small problem with my ecu. I broke one of the clips that holds it into place, so part of the ecu was never making connection which caused my car to not start. I took care of that problem with zip ties. It may still be a problem of loose wiring, but I really doubt it. And I don't believe that tuning is my problem, but I suppose there is a small chance that it is.
Anyway, if there are any ideas please fire away. I am really getting annoyed with this problem and I am absolutely certain that I will not pass inspection with this problem still occurring.
Thanks guys
03-21-2008, 07:29 PM
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Are you still running stock sensors? I'll bet your tps has crapped out. You may not even see any difference if you have a live datastream. I checked mine when I suspected it and it was ok. After much deliberation, I replaced it on a hunch, and bingo.
03-22-2008, 11:17 AM
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^^^ I have two extras sitting around at home, haha. I've tried them all to no avail. Im seafoaming my engine tomorrow morning and I'm going to do a VERY thorough chech for vacuum leaks. Im also going to clean the idle air control valve.
Edit:
Today I seafoamed my engine, checked for vacuum leaks, and I replaced my old IAC with a different one that I had laying around. Still no success. One thing I did notice is that when I unplug the connecter going to the IAC, the car idles very well. Does this mean both of my IACs are bad?
Edit:
Today I seafoamed my engine, checked for vacuum leaks, and I replaced my old IAC with a different one that I had laying around. Still no success. One thing I did notice is that when I unplug the connecter going to the IAC, the car idles very well. Does this mean both of my IACs are bad?
03-22-2008, 11:46 AM
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Vehicle: 2001 Hyundai Tiburon
Ya, I had one like that also where I would unplug it and it worked fine. I cleaned the hell out of it and ended up selling it so Im not sure how long it worked for.
03-22-2008, 11:50 AM
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^^^When you cleaned it, did it solve the problem? and also, was it safe to drive with out it plugged in?
03-27-2008, 10:35 AM
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^^^ Thanks. I will definitely check that out after I manage to figure out why the car wont start. haha