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Old 09-16-2008, 11:43 PM   #1
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Help with boost problem

Hey guys, I've run into a problem with my car that I've been trying to track down and I'm not quite sure what exactly it could be.

Symptoms:
Hanging revs, when shifting into neutral the car will hang at 1.8-2k rpms until I'm at a dead stop for a couple seconds then drop back down.
At WOT the A/F ratio is way off gauge reads 10.0
Vacuum gauge is only reading 10-12in instead of 15in at idle.

I know the first response is going to be the tune is off...but it's not. This is the same tune I was running at FocusFest and it ran just fine, AF was spot on...revs did hang a little bit, but no where near this bad. I've checked for vac leaks and found none. In my tune the min_mph_for_idle is set to 35mph, so that shouldn't be causing the hanging revs. My thoughts are that this could be the TPS or IACV. But I want to get some more opinions because I'm not getting any codes and I didn't want to just start throwing parts at her.


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Old 09-17-2008, 07:41 AM   #2
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Tunes dont change , BUT the information they get does , over time your IACV gets dirty your MAF gets dirty they get old , parts get wore out , check and clean the parts , if everything is where it should be you have the ability to make the changes so just bring things back in line with the tune

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Old 09-17-2008, 01:20 PM   #3
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Thanks Tom, I'll try to clean some things this weekend and see if that helps at all. I just didn't want to write a new tune to cover a mechanical problem. I did datalog some to try and see if it'd help me find the problem and I didn't see to many values being THAT far off in the tune...at idle my fuel trims are still pretty damn close to where they should be, at easy driving everything is good, just when the revs are hanging and WOT were things drastically different. Hopefully something is just dirty and can be easily fixed. It sucks that I won't be able to make it up to NC this weekend for your g2g though because of this. Hope it's a good turn out for you.
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