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Old 01-28-2005, 02:02 AM   #1
Derk1127
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Member#: 9134
Join Date: Aug 2001
Chapter/Region: NWIC
Location: Seattle, WA
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2000 Impreza RS-T
BRP w/Hydra+EJ257

Default Help please. Tuning RS-T at Idle

I have a 2000 2.5 RS-T which i added a Split Second FTC-1 fuel and timing controller into as well as 420cc wrx injectors. When i start my car it idles at 1100ish just fine but after a couple of minutes the idle drops and it goes into the 700ish range then it starts to stumble and die. I have no idea what is causing this as i have tried leaning out the map as well as richening it, i have gotten the Short Term Fuel trim and Long term fuel trim to within 5% at idle and it still keeps doing this am i playing with the wrong part of the map? Also i am throwing a P0301 and P0303 CELs which i think is related to my idle woes.

Also, when i try to start from a complete stop the engine hesitates and sometimes stalls, i think its related to the problem above. if you guys have any suggestions it would be great whether it be mechanical or tuning related. I have checked for vaccum leaks and there dont seem to be any. thanks
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Old 01-28-2005, 02:07 AM   #2
8Complex

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Are you altering the timing down that low? Chances are if you are correcting for injectors that much by changing the load the ECU is seeing, you are likely getting the wrong amount of timing at idle.

Also, I say good luck to you. I never got a perfect idle unless I let it idle at like 12:1 A/F ratio.
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Old 01-28-2005, 02:11 AM   #3
Derk1127
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BRP w/Hydra+EJ257

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i havent touched the timing at idle, on the ftc can you advance timing, you can only retard timing which is what i thought. do you have any maps for the ftc? thanks
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Old 01-28-2005, 05:53 PM   #4
Derk1127
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BRP w/Hydra+EJ257

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any suggestions guys?
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Old 09-22-2005, 07:44 PM   #5
kgb
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Blue Ridge Pearl

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Hate to bring up an old thread - but I'm wondering if you manage to solve your idle problem. I read that in NA form, the stock ECU advance by 10-12 degree on 87 octane. So I theorize that with higher octane, to maintain the AFR at idle to be around 14.7 you would need quite a bit of advance - just how much becomes the question.
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Old 09-22-2005, 09:41 PM   #6
rgt
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At startup the car runs richer than normal. As the car warms up it leans out. If you tried to correct it by making run richer you did the wrong thing.
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Old 09-22-2005, 10:09 PM   #7
kgb
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Blue Ridge Pearl

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I'm talking about idling when the car is warm - right now, I can only get down to 13:1 before the car wanting to stutter and die. And through some experimenting, I found some setting that seems to get me the stoich idle but it's weird how I got it.
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