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Thread: LS1B Operating System Upgrade Help

  1. #1
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    Default LS1B Operating System Upgrade Help

    Here's a small rundown of what I need help with. Along with the PCM files that will and won't run the car.

    I'm currently working on a 93 LT1 Camaro that has the Torq-heads 24x Conversion kit. The PCM that has been wired to the car is a 12200411 with H/W Version 09386530.

    I got the car to run on the factory 9381344 OS that came on the PCM by coping over all the calibrations from the 02 Chevy Express Tune that runs OS 12212156. I manually copied over all the compatible calibrations and the car starts and runs fine. Here's where I start to run into the problems. I want to upgrade to COS5 for Nitrous reasons. Since the 9381344 OS is not an upgradable OS I decided to Flash the PCM with the 02 Express Van tune I orginally copied all the calibrations from. The 02 Chevy Express van runs OS 12212156 which is a compatible OS with COS5 and it will allow me to copy over the calibrations I planned on adjusting before the COS5 upgrade to get the car somewhat on a decent tune. But, everytime I upgrade to OS 12212156 the car will not start. I have fuel but no spark. If I reload the 9381344 OS flash, the car will start and run just fine.

    What am I doing wrong?
    Attached Files Attached Files
    Last edited by fleshe; August 12th, 2018 at 09:57 AM.

  2. #2
    Joe (Moderator) joecar's Avatar
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    I think that 12212156 might not be compatible with your PCM...

    let me look thru your 12212156 ctz.

  3. #3
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    Quote Originally Posted by joecar View Post
    I think that 12212156 might not be compatible with your PCM...

    let me look thru your 12212156 ctz.
    Thank you for lookin at the files.

  4. #4
    Joe (Moderator) joecar's Avatar
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    I looked briefly, I didn't see any reason for the no-start... I'll keep looking.

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    Quote Originally Posted by joecar View Post
    I looked briefly, I didn't see any reason for the no-start... I'll keep looking.
    Do you have any suggestions Joecar? Or maybe know of a compatible OS that is upgradable with this specific PCM?

  6. #6
    Joe (Moderator) joecar's Avatar
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    During start/cranking:
    - does scantool show rpm (in real time)...?
    - does fuel pump run...?
    - do injectors fire...?
    - do spark plugs fire...?



    I'm wondering if VATS is interfering...

  7. #7
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    I will check all these items 100% this week and get you an answer


    Sent from my iPhone using Tapatalk

  8. #8
    Lifetime Member ProperTuningOG's Avatar
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    Running H/W Version 09386530 with 02020005 in about 20 different ecms just this year....... Just an FYI for compatibility

  9. #9
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    Quote Originally Posted by Team208Motorsports View Post
    Running H/W Version 09386530 with 02020005 in about 20 different ecms just this year....... Just an FYI for compatibility
    Thank you!


    Sent from my iPhone using Tapatalk

  10. #10
    Lifetime Member ProperTuningOG's Avatar
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    Will it fire with just an OS swap? Not copying everything over.

    I also know I have never had any luck running maflass with 2156 and having the DTC to C non emissions. I've always used A.

    After your full flash are you getting a true power cycle? Have you tried cal flash after the full flash?

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