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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-25-2006, 09:40 PM   #1
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Default Some scan data

Put in a new IAT 200 miles ago, and it'* reading normally.

But other stuff...

I get 5-7 degrees of KR at WOT
BLM Cell (whatever that is-short term trim?) is 9 cruising, 13 while accelerating, 16 at idle, 0 or 1 during no-throttle rolling
BLM was 138 cruising, 140 accel
Integrator 128-ish
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Old 04-25-2006, 11:50 PM   #2
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Your running just a tad lean with BLMs that high although the Intergrator is where it should be.
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Old 04-26-2006, 12:20 AM   #3
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What does the intergrator tell me? How do I interperet it?
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Old 04-26-2006, 02:40 AM   #4
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Ok I actualy got the two mixed up.
The BLM is equivalent to the long term fuel trim and the INT(Integrator) is the short term fuel trim.
Ideally you want your BLMs to stay close to or around 128 and your INTs to fluxuate around 128 as well.
BLMs over 128 mean your computer is compensating for a lean condition and making sure to add fuel at those particular load cells(based on rpm,load,tps,maf feq, etc.)
BLMs lower than 128 mean just the opposite, that your computer is compensating for a rich condition.
The INTs are the determining factor for the BLMs. It is somewhat of a real time needed fuel adjustment.
If your computer sees you have a high INT, after a certian period of time it will rise your BLMs so that your INTs will hover around 128.
Since you have BLMs rising as you accelerate, that means your computer learned that it needs more fuel at those load cells. Since your INTs are around 128, that means your computer is pretty close to if not finished learning how much fuel it needs to compensate.
But..
Your computer is designed to have final BLMs be around 128. If you do, then this means your fuel curves are close to perfect.
While the computer does compensate with the BLM, it is harder to get the fuel you actually need the further you are away from a BLM of 128.
So for now, Bill is not going to like this , But I think you have an AFC 2.x right?
In the advanced mode, If you bump up your settings from 4-6, 1% and 7+, 2% see if that gets your BLMs closer to 128. If you are still higher than 128 try bumping it up 1% more and so on.
Why aren't afc'* that great?
As you can see from what I said earlier about the load cell, which dictates how much spark and fuel you get, it is found from a number of things. The maf fequency is only 1 of those values. So you can manipulate your maf signal to get your fuel trims close for one condition (say 1/4 throttle crusing) but when your in that particular load cell for another condition (say 1/4 throttle accelerating) the fuel trims may not be the same.
But
Having had one for a year and a half now, I must say I can get my fuel trims VERY close. Close enough to where I doubt the fuel trims differ drastically from a completely stock 95 SE. But still, I am getting chip programming to eliminate it which IMO is the best option.
And somethign I kind of skipped because I'm not real sure on is the BLM Cell. I think this is the load cell I was talking about.
Sorry for the novel and I hope that answers your question.
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