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Old 01-20-2012, 02:07 AM   #1
80807STI
Scooby Newbie
 
Member#: 183266
Join Date: Jun 2008
Chapter/Region: NWIC
Vehicle:
2004 Impreza WRX STI
Silver

Default Cold weather starts and engine dying

Hey guys, heres a background on my car. 2004 STi Built engine stock bore, gt35, AEM standalone EM, and all the trimmings....

The problem: first starts in the morning or starts after sitting(cold) I get a wierd fluctuation in idle 1K-1.7K it will start normal then jump and hold for about 3-5 seconds at higer rpm then drop. When its warm after 10mins of driving it seam to even out although still not smooth. Recently its been dying out, coming to stops, idle dips below 1K and then sometime it dies.

Is this a tune issue? Fuel issue? Or could it be electrical? Any idead would be appreciated. Also if it was a fuel issue, would switching from E85 to pumpgas(current tune) be a factor? i.e injectors/fuelrail damage or clog? ITs been about 2 months since the retune.
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Old 01-21-2012, 12:25 PM   #2
80807STI
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Member#: 183266
Join Date: Jun 2008
Chapter/Region: NWIC
Vehicle:
2004 Impreza WRX STI
Silver

Default

Any ideas...well I found something in the tuners area about "cold weather tunes"...I forgot to mention that I live in Oregon and its 40 and below in the morning when it has its issues.
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Old 01-21-2012, 08:07 PM   #3
flash02
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Member#: 78916
Join Date: Jan 2005
Chapter/Region: MAIC
Location: Elizabeth City NC
Vehicle:
2002 WRX
PSM

Default

It's your IAC (idle air control valve) those dam things are very finicky especially when controlled by other then stock ECU's. You can try and clean it, if you do get the gasket for it as the old one will not be usable.
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