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Old 01-07-2007, 11:48 PM   #1
Spec_C
Scooby Newbie
 
Member#: 91423
Join Date: Jul 2005
Chapter/Region: HIIC
Location: Big Island of Hawaii
Vehicle:
2004 PSM STi on Meth
Tuned by Chris Black@AMS

Default lean idle @ start up

just started happening a few days ago. when i start up the car(txs stage 4/all supporting mods) the idle jumps up to around 1500 with afr's around 17.7 or so, then falls back to 14.8 around 1k or so. i've had my wb02 in for a year now, could this mean it's time for a new o2 sensor? i also think that i may have a exhaust leak between the downpipe and the cat-back, but that is after the o2 so i dont see how that would affect idle......help
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Old 01-07-2007, 11:55 PM   #2
gaby
Scooby Specialist
 
Member#: 94097
Join Date: Aug 2005
Location: Tucson, AZ
Vehicle:
2004 WRX Hybrid GT35
11.2@130.7

Default

The sgt 4 do that at 1700 - 1500 rpms if your injector scaling is above 560. Mine is 565. It stop doing it when I scaled my injetor with Ecuflash. Also check the gasket between the manifold and the uppipe.
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Old 01-08-2007, 03:39 AM   #3
Spec_C
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Member#: 91423
Join Date: Jul 2005
Chapter/Region: HIIC
Location: Big Island of Hawaii
Vehicle:
2004 PSM STi on Meth
Tuned by Chris Black@AMS

Default

i'll check that. the funny thing is that i've been running the stage 4 for a year already, and it just started doing it 2 days ago. anyone else got any input?
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Old 01-08-2007, 10:32 AM   #4
gaby
Scooby Specialist
 
Member#: 94097
Join Date: Aug 2005
Location: Tucson, AZ
Vehicle:
2004 WRX Hybrid GT35
11.2@130.7

Default

Cold weather. I would play with the cooolant temp enrichment below 60c. That might help.
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