Cold weather starts and engine dying

80807STI · 01-20-2012, 02:07 AM

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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80807STI · 01-21-2012, 12:25 PM

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.

flash02 · 01-21-2012, 08:07 PM

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.

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	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. * Registered users of the site do not see these ads.

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01-21-2012, 12:25 PM	#2
80807STI Scooby Newbie Member#: 183266 Join Date: Jun 2008 Chapter/Region: NWIC Vehicle: 2004 Impreza WRX STI Silver	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.

01-21-2012, 08:07 PM	#3
flash02 Scooby Newbie Member#: 78916 Join Date: Jan 2005 Chapter/Region: MAIC Location: Elizabeth City NC Vehicle: 2002 WRX PSM	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.