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  1. New ECM Operating System, now VCM Scanner issues

    I recently had my car in for service and they updated the ECM with a new core operating system. I did a full read and the tables are the same. I then re-loaded my tune. But now VCM scanner does...
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    Reset Calibration Count?

    I've recently acquired a full GM diagnostics suite and while learning the tools (GM MDI, GDS2, Tech2Win), i found the ECU calibration counter. As many have mentioned, for this ECM (E80, Cadillac...
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    HA! I remember the first time this happened to...

    HA! I remember the first time this happened to me. I tried an overly aggressive .75ms commanded shift. On a hard run up through the gears, it tried to shift to 3rd and it just made a loud clunk,...
  4. Did this work for you?

    Did this work for you?
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    It's tough to just show a set of values and state...

    It's tough to just show a set of values and state "this is what you need". The reality is that it's a trial and error process. For example, i found that if i try to go overly aggressive with shift...
  6. Feature request - Instant chart in Scanner from Editor

    It would be awesome if there was a way to select any given table in Editor and select "Create Chart in Scanner" (or similar) and the software would create the appropriate axis labels, select the...
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    Open loop with STFT. Say what?

    Sorry for a dumb question, but during WOT the ECM goes open loop which means the O2 sensor is ignored. But yet I'm still seeing STFT adjustments during the WOT pull. How can the ECM know about...
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    @15psi, thanks for the info - I had not heard of...

    @15psi, thanks for the info - I had not heard of Race Gas Octane Booster so started looking around on the internet. The stuff reviews very well. It does leave the same orange residue on plugs and...
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    Test done from pumps in NE Ohio. I also expected...

    Test done from pumps in NE Ohio. I also expected higher percentages, but even if my measurements were a bit off, the fact they're all relatively close in results answers the question about one having...
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    I ran some tests to satisfy my own curiosity. I...

    I ran some tests to satisfy my own curiosity.
    I happen to have four gas jugs so I bought gas from 4 stations including the BP that caused me the above noted issues. Results are below

    Sunoco 93:...
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    I did not notice a difference in soot or smoke...

    I did not notice a difference in soot or smoke between the two blends, but I'll admit I wasn't focused on it.

    To satisfy my OCD, i ordered an ethanol tester. I'll report back on my findings.
    ...
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    Thanks @sillycon, that's a great suggestion. I...

    Thanks @sillycon, that's a great suggestion. I always had the belief that only ethanol content of over 30% has any material impact on detonation prevention and 10% versus 0% would not be...
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    BP gas as bad as claimed?

    I have a moderately tuned turbo 2.0, and have it running slightly aggressive in ignition and cam timing. I run nothing less than 93 octane and always use Shell or Sunoco.

    Last weekend I found...
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    LTG w/ E80 have WB O2?

    I'm seeing conflicting info on the interwebs with some folks saying this was added for '16. Does anyone know if the 2016 and 2017 LTGs with the E80/E80A ECMs have a factory wideband O2 sensor? When...
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    Believe it or not, that table above with all the...

    Believe it or not, that table above with all the zeroes is not the result of me playing. It's the actual factory table for lockup when in TUTD mode. It surprised me when I saw it and even more...
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    lt1z350 - do you know if zeros in the TCC tables...

    lt1z350 - do you know if zeros in the TCC tables means "never apply" or "always apply"? Take a look at this screenshot as an example
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    Thanks @lt1z350, good info. I did a quick search...

    Thanks @lt1z350, good info. I did a quick search on all the normal online GM parts catalogs and can't find converter part numbers for the 2016s, but I'll keep looking.
  18. The 4L80 was originally designed in 1990 and...

    The 4L80 was originally designed in 1990 and rolled out in '91/'92. It's a quarter century old design. Perhaps that's part of the disagreement/misunderstanding in this thread - some are talking...
  19. I totally agree that software programming can't...

    I totally agree that software programming can't change mechanical limitations. But I also see @Mr Smith's point - the fact that so much more of modern transmissions are electronically controlled,...
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    8L45, ATS vs Camaro

    Curious find. I'm comparing the stock tunes on two 2016 LTG alphas, an ATS and a Camaro. There are a few minor differences overall but one thing that stands out as pretty dramatically different is...
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    Thanks @dermotw, that helps a lot. One more...

    Thanks @dermotw, that helps a lot. One more question, why does my log show the O2 values as constantly jumping up and down? Is there a way to smooth or average the values?

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    Newb - interpreting narrowband O2

    Looking for some feedback on what value logging stock O2 sensors provide. I know that basically i should only see the voltage (mV) change from relative lean to relative rich and bounce back and...
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    Advice on GM 2.0T weird boost scenario

    Moderators: Posted to wrong thread. Please move to GM I4 Engine thread. Thanks!

    I have a confusing scenario that I'm hoping someone can suggest a place to start.

    Caddy ATS 2.0T w/ automatic....
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    Reader upload time out on TCM after ECM

    I can't seem to get a full vehicle read. I have "Read Entire" selected on both my ECM and TCM. VCMEditor will read the ECM just fine, but after the 15 second wait, it will time out when trying to...
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    Cleveland area GM techs?

    Anyone in the Cleveland, Oh area with a Tech 2/SPS/TISWeb? I want to get a new ECM flashed for my VIN/car (2016 ATS) and do not want to do it through the dealership. Looking for someone who is...
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