I've tried it all: Idle Problem Persists
#1
I've tried it all: Idle Problem Persists
Hey guys,
I've exhausted every common fix, I think, for my 2000 SE Manual.
Maybe you guys can point me to some other ideas.
Symptoms: Idle is always perfect during warm up/cold start. After warm up period it *sometimes* decides to dip to 200rpms, or die altogether. Performing the idle relearn fixes this for another couple hundred miles, sometimes even more, but eventually it decides to die at a stoplight again.
Car has: New plugs, new IACV, new MAF, new PCV, and new air filter
Car gets great gas mileage, has no power band issues of any kind. Throttle response is great.
I can't find any vacuum leaks or obvious bad hoses. After the new IACV, the idle was more consistent, but still went back to dying again a few days later. I assume the IACV did help, but wasn't the root cause.
I've learned to live with the issue, as I can usually get it to idle again by turning it off for ten seconds and restarting. not always. Then when I get home, I do the relearn.
Throttle body? Sensors?
Thanks for all your help
I've exhausted every common fix, I think, for my 2000 SE Manual.
Maybe you guys can point me to some other ideas.
Symptoms: Idle is always perfect during warm up/cold start. After warm up period it *sometimes* decides to dip to 200rpms, or die altogether. Performing the idle relearn fixes this for another couple hundred miles, sometimes even more, but eventually it decides to die at a stoplight again.
Car has: New plugs, new IACV, new MAF, new PCV, and new air filter
Car gets great gas mileage, has no power band issues of any kind. Throttle response is great.
I can't find any vacuum leaks or obvious bad hoses. After the new IACV, the idle was more consistent, but still went back to dying again a few days later. I assume the IACV did help, but wasn't the root cause.
I've learned to live with the issue, as I can usually get it to idle again by turning it off for ten seconds and restarting. not always. Then when I get home, I do the relearn.
Throttle body? Sensors?
Thanks for all your help
Last edited by mrpopo573; 05-14-2011 at 03:02 PM.
#3
To anyone else, I should of stated I have NO check engine light/codes. Any other ideas???
#4
If my knock sensor was going bad I'd have problems throughout the power band. I've replaced a few of those, they are not idle specific. The gaskets are a good idea. I also should clean my throttle body.
To anyone else, I should of stated I have NO check engine light/codes. Any other ideas???
To anyone else, I should of stated I have NO check engine light/codes. Any other ideas???
#6
Those would almost certainly throw a code.
Honestly? With that much work, I'd check fuel pressure. I'd also check to make sure some critter isn't nesting in your airbox.
Also, double-check those connectors for corrosion, if they have been stressed, etc, and replace as needed. But then, I am VW-trained, so I have chased more electrical ghosts than most.
Honestly? With that much work, I'd check fuel pressure. I'd also check to make sure some critter isn't nesting in your airbox.
Also, double-check those connectors for corrosion, if they have been stressed, etc, and replace as needed. But then, I am VW-trained, so I have chased more electrical ghosts than most.
#9
#10
Thanks for the ideas guys.
Tps- perhaps this is the next part
Coils: already multimetered and replaced a few of those a month or two back (this problem pre dates those and existed during and after their issues)
Fuel pressure/Filter is a long shot. I think I would of seen a driveability issue during WOT or any other usage other than idle. Like hard starts, etc.
Tps- perhaps this is the next part
Coils: already multimetered and replaced a few of those a month or two back (this problem pre dates those and existed during and after their issues)
Fuel pressure/Filter is a long shot. I think I would of seen a driveability issue during WOT or any other usage other than idle. Like hard starts, etc.
#11
Thanks for the ideas guys.
Tps- perhaps this is the next part
Coils: already multimetered and replaced a few of those a month or two back (this problem pre dates those and existed during and after their issues)
Fuel pressure/Filter is a long shot. I think I would of seen a driveability issue during WOT or any other usage other than idle. Like hard starts, etc.
Tps- perhaps this is the next part
Coils: already multimetered and replaced a few of those a month or two back (this problem pre dates those and existed during and after their issues)
Fuel pressure/Filter is a long shot. I think I would of seen a driveability issue during WOT or any other usage other than idle. Like hard starts, etc.
#13
So as an update: I just pulled my ECU for a rebuild. A thorough diagnostic revealed that the computer refuses to keep idle parameters. No vacuum, electrical, TPS or other problems were the culprit. My shop thinks that the IACV took out the ECU (the dreaded ultimate problem).
200 dollar rebuild from a company in California I found on here. Fingers crossed.
200 dollar rebuild from a company in California I found on here. Fingers crossed.
#15
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