BLM Cells 16 17 18 only in CLOSED LOOP?
08-10-2010, 09:23 PM
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Car: 84 z28 CMC1 spec
Engine: L69
Transmission: BW T5
Axle/Gears: 3.45 9bolt
BLM Cells 16 17 18 only in CLOSED LOOP?
Hello thirdgen tuning community,
It seems like there is a lot of knowledge here so maybe someone will be able to recognize my problem.
I am running a 93 LT1/T56 and 16159278 ECM. I use TunerPro RT v4.14 to datalog and burn chips via the Moates PROM. Since I initially tuned it a few years ago it has been running great but it has never strayed outside of BLM cell numbers 16, 17, or 18 (for idle, DFCO, and open loop respectively). I was still able to dial in the VE tables to keep the BLMs in line.
BLM Cell RPM Boundaries: Hi=2600, Mid=1800, Lo=1200
BLM Cell MAP Boundaries: Hi=80, Mid=60, Lo=40
(even though they're very close, I also tried the stock values here)
So my question is: when the ECM is indicating a closed loop condition (with O2 sensors active, "learn mode" enabled, and BLMs updating) what could be keeping me from entering BLM cells 0 thru 15?
It seems like a long-shot, but I am beginning to suspect there is a flag or switch that needs to be set for one of the seemingly unrelated sensors that I am no longer using (egr, purge, etc...) to somehow enable the closed loop cells.
I have attached a compressed folder containing my current XDF ($DA3.xdf), BIN (Current_Tune.bin), ADS (My_LT1_Datastream_D.ads), a short datalog ADL (Current_Tune.adl) and some reference code text files.
The XDF, and ADS can obviously be viewed in Notepad or Wordpad but the ADL and BIN need to open with TunerPro or similar. I can also produce a TTS Datamaster log if it would help.
I feel pretty comfortable with the hardware, software, and theories but I am missing something huge here!
It seems like there is a lot of knowledge here so maybe someone will be able to recognize my problem.
I am running a 93 LT1/T56 and 16159278 ECM. I use TunerPro RT v4.14 to datalog and burn chips via the Moates PROM. Since I initially tuned it a few years ago it has been running great but it has never strayed outside of BLM cell numbers 16, 17, or 18 (for idle, DFCO, and open loop respectively). I was still able to dial in the VE tables to keep the BLMs in line.
BLM Cell RPM Boundaries: Hi=2600, Mid=1800, Lo=1200
BLM Cell MAP Boundaries: Hi=80, Mid=60, Lo=40
(even though they're very close, I also tried the stock values here)
So my question is: when the ECM is indicating a closed loop condition (with O2 sensors active, "learn mode" enabled, and BLMs updating) what could be keeping me from entering BLM cells 0 thru 15?
It seems like a long-shot, but I am beginning to suspect there is a flag or switch that needs to be set for one of the seemingly unrelated sensors that I am no longer using (egr, purge, etc...) to somehow enable the closed loop cells.
I have attached a compressed folder containing my current XDF ($DA3.xdf), BIN (Current_Tune.bin), ADS (My_LT1_Datastream_D.ads), a short datalog ADL (Current_Tune.adl) and some reference code text files.
The XDF, and ADS can obviously be viewed in Notepad or Wordpad but the ADL and BIN need to open with TunerPro or similar. I can also produce a TTS Datamaster log if it would help.
I feel pretty comfortable with the hardware, software, and theories but I am missing something huge here!
Last edited by chevyspence; 09-07-2010 at 01:04 PM.
09-07-2010, 01:06 PM
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Car: 84 z28 CMC1 spec
Engine: L69
Transmission: BW T5
Axle/Gears: 3.45 9bolt
Re: BLM Cells 16 17 18 only in CLOSED LOOP?
Any thoughts? Or, as a last resort, any GM tuning gurus that you think I could ask?
Thanks!
Thanks!
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