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    my bad. I did not look at the year.... GM does...

    my bad. I did not look at the year.... GM does some strange stuff.
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    the pcm controls it. best I can tell you is to...

    the pcm controls it. best I can tell you is to empty it, fill it to 1/4 tank and read what the gauge says. Then adjust how much fuel is in it until you get the 1/4 tank mark. same as you go up till...
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    8.1L + allison scanner question

    I can read and write the transmission portion of the tcm but when I use the scanner portion to watch shift speed and torque converter stuff it doesn't read anything. Never had a seperate computer for...
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    Tuning the 8.1?

    Has anyone been able to tweak the stock 8.1 chevys? I see there is a company that claims with their computer swap that you can get 50 more horsepower and 60 ft lbs of torque... I would think with...
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    I read this whole thing from start to finish....

    I read this whole thing from start to finish. This is amazing! I also have a rebuilt 7.4 in a 1999 suburban. Mild comp cam. Switched it to the 411 pcm. Since there is no real tune file for it, I...
  6. I eliminated my ABS as well.... Pull the cluster...

    I eliminated my ABS as well.... Pull the cluster out a bit and take out the bulb. That is the only option.....
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    I am VERY interested in lean/cruise mode... I...

    I am VERY interested in lean/cruise mode... I have it on my 411 pcm but I have heard on this forum it isn't in operation. My big block sucks fuel...
  8. Thread: dfco settings

    by 99k2500
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    18,450

    My brain hurts. I have tried this as my big...

    My brain hurts. I have tried this as my big block suburban eats fuel like how a fish lives in water.... I have normal driving through rural area. DFCO enabled cut coasting down by almost half,...
  9. Thread: Lean cruise

    by 99k2500
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    12212156 0411 pcm swapped 7.4L

    12212156 0411 pcm swapped 7.4L
  10. Thread: 454 0411 swap

    by 99k2500
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    119844 Mild cam and slightly bigger...

    119844

    Mild cam and slightly bigger injectors.... BUT it should get you somewhere... I hope it helps.
  11. Thread: Lean cruise

    by 99k2500
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    I'm sure you are busy.... BUT, curious if you...

    I'm sure you are busy.... BUT, curious if you have looked at the data for the EQ ratio subtractor vs RPM vs CYL AIR table? I don't want to start making up stuff without looking at some actual data...
  12. Thread: Lean cruise

    by 99k2500
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    You wouldn't have any data to put in the lab...

    You wouldn't have any data to put in the lab cruise field you'd be willing to share would ya? Mine is all zeros
  13. Thread: Lean cruise

    by 99k2500
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    I know us guys with the 411 swapped chevy big...

    I know us guys with the 411 swapped chevy big blocks would love to have a leaner cruise. 10mpg on the highway at 65mph..... I would totally go for a couple more mpg. Planning a trip from michigan to...
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    first.... There might be a small screw for the...

    first.... There might be a small screw for the throttle body that will get your TPS% to zero. Usually the idle trims will stop updating if the throttle position sensor is reading something. Look at...
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    118335

    118335
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    The motor got a new factory crank, it was bored...

    The motor got a new factory crank, it was bored .030 for the replacement cylinders, has a mild cam upgrade from comp cam. No cats and 3 inch all the way back. I originally got these as everyone said...
  17. Try pin 47. It shows for me the 5v reference....

    Try pin 47. It shows for me the 5v reference. That is what you use to log the signal voltage. Then the math is pretty easy after that to convert the voltage to an AFR percentage.
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    All I did for my 4L80e is copy and paste the...

    All I did for my 4L80e is copy and paste the shift scheduling to match in every table. It is all based on throttle position anyway, so at light throttle you can have it shift at a lower speed while...
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    I got it dyno'd. It drives the best it has so...

    I got it dyno'd. It drives the best it has so far. I upgraded the injectors to a slightly bigger size. I think I'm dealing with a injector pulse width issue. I think it cruise speed and idle its...
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    email tuning vs dyno trip, worth it?

    Went through a company logging and emailing tunes back and forth. It ran, ok... Not super crisp like I would imagine it to, but its a street driven big block with only a mild cam upgrade and the 4...
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    1999 0411 swapped 454 #4 misfire

    It can only sometimes be felt, unknown if it actually is misfiring. The motor was professionally rebuilt, new distributor, plugs, wires, injectors, fuel pressure regulator. Randomly while cruising...
  22. 2000 gmc jimmy O2 stops and starts working?

    It will cycle on closed loop, then under acceleration, it drops to like 33 MV.... No throttle it cycles again. Getting a code for low voltage on bank 1 sensor 1. Replaced it with no change. I'm...
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    2nd set of Bosch 4 hole stock 22lb/hr injectors...

    2nd set of Bosch 4 hole stock 22lb/hr injectors and still running rich as all get out. The ones I purchased got replaced from the company because I thought they were the wrong ones. Nothing has...
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    stock injectors. EVERYTHING is stock replacement....

    stock injectors. EVERYTHING is stock replacement. I don't know what sensor you are referring to.
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    104138

    104138
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