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Old 03-19-2006, 10:59 AM   #1
scoobyless
Scooby Newbie
 
Member#: 40192
Join Date: Jul 2003
Chapter/Region: NESIC
Location: New Milford, CT
Vehicle:
04 STi
Blue/Gold

Default lean idle

Hi, I have an 04 STi with utec/tuner along with fmic, intake, exhaust, etc. Recently after installing the ewg I started having a really lean idle throwing the p0171 cel even though I know the ewg couldn't really be causing this so I'm assuming it's the fmic/intake which I put on a week earlier. My cruising afr's are really solid along with wot pulls, just my idle afr gets up to 17-18 at times and sometimes around 20 after driving and pushing in the clutch. I was wondering if there would be a way to tune in order to get the idling afr down. Thanks!

Randy
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Old 03-19-2006, 08:30 PM   #2
Davenow
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Member#: 23676
Join Date: Aug 2002
Chapter/Region: NESIC
Location: de_dust and Orgrimar
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.

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check for exh leaks before the o2 sensor. I had the same thing. I was reading 17.5-1 at idle, but if I was on the gas at all, they were normal.
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Old 03-19-2006, 10:01 PM   #3
scoobyless
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Join Date: Jul 2003
Chapter/Region: NESIC
Location: New Milford, CT
Vehicle:
04 STi
Blue/Gold

Default

I'm assuming your talking about the first 02 sensor, correct? And that would just be leaks in the header, right?
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