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Thread: hi! I've been bustin' knuckles for 30 years but new to reprogramming PROMS

  1. #1
    Carb and Points!
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    hi! I've been bustin' knuckles for 30 years but new to reprogramming PROMS

    I have a 93 GMC 1ton truck that had california emissions and a throttle govenor on it (Rochester TBI) The govenor malfuntioned on it and it was annoying so I replaced it with a federal emission TBI from the parts shed (no idea what year{I do know that it is an OEM Holly TBI}).

    The difference in power is amazing! but with the new TBI it won't idle for more that 120 seconds. At exactly 120 seconds the RPM's start to drop and then bounce back and the engine boggs down and dies. I replaced the MAP sensor, TPS, Idle air speed motor, the entire fuel system from the fuel tank forward and the coil, cap and rotor, plugs and wires with no change in symptoms .

    Then in desperation I went to the junk yard and got 2 "blue keys" for the PCM. My idle problem was instantly gone when I plug in either of them! Bad news is that it runs rough with no power and won't shift. Both keys came from trucks with the 4L60E trans, mine is 4L80E. So now I'm diving into learning about reprogramming!

    I'm really excited to be learning how to tune, I'd really appreciate help getting this sorted out. After I figure out how to get my truck to idle, I want to reduce the fuel pump cut off speed on my wife's 97 3/4 ton chevy from 99mph down to 78mph to minimize tickets

    I have a few questions:

    * I have the blue Key, why is everyone switching to earlier or later systems?

    * do I need to erase the program that are on the new chips currently or will they be overwritten by the ALDUI box when I plug in Tuner Pro?

    * If I do need to erase the blue keys, is this done with UV light like some other chips?

    * If it is erased by UV, can I just leave it in the sun for a day ;Sunlight has MASSIVE UV!

    *Is there anything I'm missing or should know about before getting started?


    This is what I have discovered so far on this AWESOME FORUM!

    $31 is for the 4L80E trans

    This is where you find your program files:

    http://www.gearhead-efi.com/Fuel-Inj...our-files-here

    You need to down load Tuner pro: http://www.tunerpro.net

    You need to buy this cable AND this ALDUI box to talk to your PCM: http://www.moates.net/aldu1-and-cabl1-p-127.html

    Here is a tutorial to get started http://www.gearhead-efi.com/Fuel-Inj...a-must-read!-)

  2. #2
    Carb and Points!
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    Don't you hate it when You spend 2 hours writing and editing a good story and then when you upload it- it looks like this! AAaarghh!

  3. #3
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    Yes. And one of these days I'll solve the issue. In the meantime, your post is fixed.

    FWIW HTML is not active for this forum.

  4. #4
    Carb and Points!
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    Quote Originally Posted by 1project2many View Post
    I'll solve the issue. In the meantime, your post is fixed.

    .
    Thanks! I'm still sorting out how to get Tuner pro to talk to ECM.
    b
    Tuner pro goes Pink and displays "connecting" but never does. I added a positive jumper to terminal 'B'on OBD1 port and got the blue "connected"status for about 1/2 second before it goes red and say that there is a connection error.

    Can the wrong xds or bin file cause the connection error?

  5. #5
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    I don't have a bunch of experience with Tunerpro but I do know that you can use data acquisition without loading a .bin or an .xdf.

  6. #6
    Fuel Injected! steveo's Avatar
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    only the wrong adx/ads would cause a problem. the xdf and bin you have loaded have nothing to do ecm communication (they could be for a different car and you'll still get your data)

  7. #7
    Fuel Injected! MQQN28's Avatar
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    Hi

    Not a big expert on this but some basic checks
    Are you using a straight jumper or a 10K resistor. You only need to flash it to start the data. Different jumper values give different data packets.
    The other thing to check is if your using a cable is weather the RS232 box is checked. Usually not for blue tooth, but for cable. this can stop data trans mission.
    The best way to set this is open the ADX file in tuner pro and check/uncheck the rs232 box.

    MOC
    Ford 28 Roadster Pick Up
    Ford Flathead 51 8BA. Balanced, ported,3/4 cam, Edelbrock 59A heads, C4 trans, 8" diff 3.55 narrowed 40mm /side.
    Fuel injection by Flatattack racing, 60mm Holden TB.
    ECM Delco 1227808 160 baud.

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