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Thread: Tuning a crate 350 H.O.

  1. #61
    RIP EagleMark's Avatar
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    Quote Originally Posted by rokcrawlin85 View Post
    disabling checksum does what exactly to an ECM?
    You change the maskID to AA while emulating, I've always changed it back when done, I don't know what it would do to ECM if left at AA?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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  2. #62
    You really shouldn't have to disable the checksum for chip burning. When you save the file, TunerPro should update the checksum for you.

    Disabling the checksum prevents the ECM from "verifying" the binary file on the chip. Normally, it looks at the checksum to verify that the binary file is not corrupted.
    Familiar with 1227747 and 16197427 PCMs

  3. #63
    RIP EagleMark's Avatar
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    I think the reason for AA to disable checksum while Emulating is because your changing the bin live...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  4. #64
    Fuel Injected! PJG1173's Avatar
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    Quote Originally Posted by EagleMark View Post
    I think the reason for AA to disable checksum while Emulating is because your changing the bin live...
    is there a writeup around here on emulating? I always seem to have problems trying to emulate.
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  5. #65
    RIP EagleMark's Avatar
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    Moates has instructions on their website. If you need more than that start a thread and I'll try and help.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  6. #66
    Fuel Injected! 1leg's Avatar
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    I only change it to AA on that chip to make sure it wasn't a check-sum fault that was causing my blinking CEL. when putting the 8747 bin in my 7747 to see if it would work. it didn't.
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