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  1. #1
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    understanding/tuning GM TBI : beginner

    Greetings,

    I have owned TBI - powered rigs (91 Suburban, 94 G20 van) for a decade and while I have loved the dependability I have only rally partaken in basic troubleshooting and maintenance and I seek to know more and to better understand the system and, modify/tune it myself.

    The 215k mile 350 in my 94 G20 lost oil pressure and seized up. I will be installing either a used or rblt long block and am taking this opportunity to learn how to datalog and tune the system. I aim to mildly modify the engine with a Vortec 350 roller cam, perhapse a slight compresion bump along with simple TBI and exhaust mods to improve torque and pulling power. Nothing too crazy this time around.

    I have been looking at moates.net and a I like their AUD1 kit for OBD1 chip burning/tuning. I gather that Tuner Pro RT is a good software to use.

    My ECM service number is 16196395 and the 4 - letter code is BJLK

    I am still trying to understand ECM masks and BIN files and their relationship. Any help for this rookie is appreciated
    Last edited by Zodiac; 02-11-2015 at 03:49 AM.

  2. #2
    Fuel Injected!
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    Quote Originally Posted by Zodiac View Post
    Greetings,

    I have own TBI - powered rigs (91 Suburban, 94 G20 van) for a decade and while I have loved the dependability I have only rally partaken in basic troubleshooting and maintenance and I seek to know more and to better understand the system and, modify/tune it myself.

    The 215k mile 350 in my 94 G20 lost oil pressure and seized up. I will be installing either a used or rblt long block and am taking this opportunity to learn how to datalog and tune the system. I'd to mildly modify the engine with a Vortec 350 roller cam, perh apse a slight compresion bump along with simple TBI and exhaust mods to improve torque and pulling power. Nothing too crazy.

    I have been looking at moates.net and a I like their AUD1 kit for OBD1 chip burning/tuning. I gather that Tuner Pro RT is a good software to use.

    My ECM service number is 1616395 and the 4 - letter code is BJLK

    I am still trying to understand ECM masks and BIN files and the lir relationship. Any help for this rookie is appreciate.
    If memory serves me correctly that should be a $E6 mask although it could be a $OD.

  3. #3
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    What do the "$E6" and "$0D" stand for decoded?

  4. #4
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    Howdy, and welcome!

    The official name for those strange codes is Mask ID. The leading dollar sign means they are hexadecimal numbers and could actually be written as 230 ($E6) and 13 ($0D). Functionally they are a means to identify a specific program that runs in a vehicle computer. It's far easier (and more specific) to say "$0D" than "94 - 95 C/K Truck, Van, S-10 LN2 (16168505), 4.3L, 5.7L & 7.4L program." Many programs contain the code mask in the earliest part of the calibration data.

    Since a code mask identifies a program, a program with a specific mask may or not run on a given ecm/pcm. If the program is used in the same pcm as the factory intended, it will run. If the program is used in a different ecm, the code may not run. In a few cases users have determined that a program written for one ecm will run in another. In other cases it's been determined that one part number pcm replaces another. The two masks, $E6 and $0D, represent two different programs that GM may have used in your pcm.

    A bin file is a binary file. Data "read" from an ecm is in binary format. If this data is saved as it's read without being converted to a different data format, it's a binary file. Binary files which contain a copy of the ecm's operating program are usually saved with the extension .bin. Binary files that will work in your pcm will contain the $E6 or $0D program.

    After you have some experience you might shorthand some of these words and phrases to say things like "I'm using $E6 in a 7427 but I'd like to know where to get a $0D bin."

    Hope this helps.

  5. #5
    Carb and Points!
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    Thank you for the welcome.

    Excellent reply. Very helpful indeed.

    I also found this thread that is very helpful.
    http://www.gearhead-efi.com/Fuel-Inj...must-read!-%29

  6. #6
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    I will be doing a lot more reading while I look for a suitable engine core.

    First things first. I will be getting a laptop and uploading Tuner Pro RT.

  7. #7
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    Welcome...lots of great info and guys here. I use the adu1 from moates as well. Always seems to work trouble free for me.

  8. #8
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    Quote Originally Posted by Zodiac View Post
    I will be doing a lot more reading while I look for a suitable engine core.

    First things first. I will be getting a laptop and uploading Tuner Pro RT.
    Personally I would start with a Vortec roller 350 core. Do you have emissions testing where you live in Texas? I also would not use the Vortec roller cam. Its actually a smaller cam than the stock TBI cam and does some goofy things to the spark advance requirements.

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