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Thread: Bought a car hauler, got a Fbomb

  1. #1
    Fuel Injected! doc_rock's Avatar
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    Bought a car hauler, got a Fbomb

    and that's how the story goes. - like 10 years ago, just now deciding to stop fighting EFI and learn how to work on it.
    Been playing with the diesels, decided to try out the old technology. Got a steep learning curve.

    1990 IROC-z, yellow dash and all, 355 with LT4 heads, a T56, and all sorts of parts that were never designed to go on this car. Has a custom BIN burned in 06 by.. Somebody .. whoever JM is. It doesn't seem to like the manual transmission, and I don't know where base timing is supposed to be, and.. well.. yeah, I just have to figure it out.
    Won't run on any of the stock BIN files, I tried three so far.
    I'll be back later, let me go break something.

  2. #2
    Super Moderator dave w's Avatar
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    What EFI computer are you using? The 1990 IROC-z would likely have been the 1227730. The good news, the 1227730 has very good support: http://www.gearhead-efi.com/Fuel-Inj...Information-8D

    dave w

  3. #3
    Fuel Injected! doc_rock's Avatar
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    Quote Originally Posted by dave w View Post
    What EFI computer are you using? The 1990 IROC-z would likely have been the 1227730. The good news, the 1227730 has very good support: http://www.gearhead-efi.com/Fuel-Inj...Information-8D

    dave w
    Affirmative, 1227730 ANJF on the case. Currently has a UV EEPROM on the board (I don't know if that's stock or not) and a sticker on the chip that says JM B012 355-tpi-730 6-5-05

    I am about to burn the S_AUJP v6 to a chip and see if it'll start.
    1990 F-Bomb
    355 urethane mounted noisemaker
    LT4 Roller Top end
    Some sort of cam
    vette stopping stuff
    4th gen rear
    headers that belong in a trash can
    some other unimportant things
    +15hp steering wheel and wheels combo

  4. #4
    Fuel Injected! doc_rock's Avatar
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    Quote Originally Posted by dave w View Post
    What EFI computer are you using? The 1990 IROC-z would likely have been the 1227730. The good news, the 1227730 has very good support: http://www.gearhead-efi.com/Fuel-Inj...Information-8D

    dave w
    annnnd here's where we get stuck. Every bin file I've loaded on three different chips does the exact same thing.
    I got to get smarter to figure out where to start.
    1990 F-Bomb
    355 urethane mounted noisemaker
    LT4 Roller Top end
    Some sort of cam
    vette stopping stuff
    4th gen rear
    headers that belong in a trash can
    some other unimportant things
    +15hp steering wheel and wheels combo

  5. #5
    Super Moderator dave w's Avatar
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    There are challenges with erasing and burning chips. The original '7730 chips are 12.5 volts. I'm embarrassed to ask, you know how to correctly identify pin 1 on a 28 pin chip? If your using a 27SF512 chip, it needs to programmed with an offset. The original '7730 chip is 32K, the 27SF512 is 64K.

    dave w

  6. #6
    Fuel Injected! doc_rock's Avatar
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    Don't be embarrassed. I'm an IT project manager, we are literally designed to both ask stupid questions and give stupid answers.

    Now we're getting somewhere. I vaguely remember reading that now that you mention it - but honestly I've read so much in the last two weeks, I bet I couldn't successfully program a coffee pot to turn on at the moment.
    OK. Pin 1 is in the same spot as cylinder 1, if the notch on the chip is the water pump - right?
    And I think you're telling me the chip is loaded FILO, and I have to start at the 32k mark and load middle to back?
    So should I be starting in 000020?

    Edit: I'm programming 256b chips - that should be 32k.
    AT29C256
    Last edited by doc_rock; 05-26-2020 at 12:33 AM.
    1990 F-Bomb
    355 urethane mounted noisemaker
    LT4 Roller Top end
    Some sort of cam
    vette stopping stuff
    4th gen rear
    headers that belong in a trash can
    some other unimportant things
    +15hp steering wheel and wheels combo

  7. #7
    Super Moderator dave w's Avatar
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    Image of pin numbering below. The AT29C256 is 32K, so programming goes from address 000000 to 007FFF.

    dave w

    3et8G.jpg

  8. #8
    Fuel Injected! doc_rock's Avatar
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    Quote Originally Posted by dave w View Post
    Image of pin numbering below. The AT29C256 is 32K, so programming goes from address 000000 to 007FFF.

    dave w

    3et8G.jpg
    Yep, so all that is right. re-burned a second chip, checksum ok, installed, same thing. Misfire, won't rev, won't idle, won't stay running, but no SES.
    It will run OK on the original memcal, won't run at all on anything I've burned.
    1990 F-Bomb
    355 urethane mounted noisemaker
    LT4 Roller Top end
    Some sort of cam
    vette stopping stuff
    4th gen rear
    headers that belong in a trash can
    some other unimportant things
    +15hp steering wheel and wheels combo

  9. #9
    Fuel Injected! doc_rock's Avatar
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    and everything i'm reading says these chips are 5v only.
    So - what chip should I buy?
    I can't imagine 5 different .bin files all run the thing the exact same way - when everybody else is using them. So that usually only leaves user error.
    (No I have no idea what I'm doing)
    1990 F-Bomb
    355 urethane mounted noisemaker
    LT4 Roller Top end
    Some sort of cam
    vette stopping stuff
    4th gen rear
    headers that belong in a trash can
    some other unimportant things
    +15hp steering wheel and wheels combo

  10. #10
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    what eprom programmer are you using?
    -Carl

  11. #11
    Super Moderator dave w's Avatar
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    Interesting information, "runs OK with Original Memcal".

    I have the equipment to erase and reprogram Original Memcals. I've been thinking you have similar capabilities to erase and reprogram Original Memcals?

    Pics of your setup would help clarify what help you need.

    dave w

  12. #12
    Fuel Injected! doc_rock's Avatar
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    Quote Originally Posted by In-Tech View Post
    what eprom programmer are you using?
    Moates Burn 2, and Moates Flash & Burn
    Also have the Moates G1 memory adapter
    1990 F-Bomb
    355 urethane mounted noisemaker
    LT4 Roller Top end
    Some sort of cam
    vette stopping stuff
    4th gen rear
    headers that belong in a trash can
    some other unimportant things
    +15hp steering wheel and wheels combo

  13. #13
    Fuel Injected! doc_rock's Avatar
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    Quote Originally Posted by dave w View Post
    Interesting information, "runs OK with Original Memcal".

    I have the equipment to erase and reprogram Original Memcals. I've been thinking you have similar capabilities to erase and reprogram Original Memcals?

    Pics of your setup would help clarify what help you need.

    dave w
    Sorry. I thought I clarified, but I think that's actually in another post in the GM EFI forum. My mistake.

    All Moates stuff ; Moates Burn 2, Moates datalog cable, Moates Flash & Burn software, and TunerPro editing/logging.
    I have the Moates G1 so I can keep cold start and limp home, and am trying to program the EEPROM chips and use them instead.

    I say "runs OK" as in it runs the same with the original memcal as it did before. It still has no power, runs rich, loses timing, turns fans on at odd points, and thinks it's an automatic.
    1990 F-Bomb
    355 urethane mounted noisemaker
    LT4 Roller Top end
    Some sort of cam
    vette stopping stuff
    4th gen rear
    headers that belong in a trash can
    some other unimportant things
    +15hp steering wheel and wheels combo

  14. #14
    Super Moderator dave w's Avatar
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    I think a few things need to verified. Pictures really help!
    Is the Memcal correctly installed onto the G1 adapter? (backwards installation is a real possibility)
    Is the chip correctly installed into the G1 Adapter? (backwards installation is a real possibility)
    Is the Burn 2 correctly configured for erasing and programming the AT29C256? (incorrect configuration is a real possibility)
    Was the AT29C256 correctly installed in the Burn 2 when programming the chip? (backwards installation is a real possibility)
    Was the AT29C256 correctly indexed in the Burn 2 when programming the chip? The Burn 2 is capable of programming chips with 32 pins. (incorrectly indexing the chip into the Burn 2 is a real possibility)

    Moates.net support link for the G1: http://support.moates.net/g1/

    dave w

  15. #15
    Fuel Injected! doc_rock's Avatar
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    Quote Originally Posted by dave w View Post
    I think a few things need to verified. Pictures really help!
    Is the Memcal correctly installed onto the G1 adapter? (backwards installation is a real possibility) Yes
    Is the chip correctly installed into the G1 Adapter? (backwards installation is a real possibility) Yes
    Is the Burn 2 correctly configured for erasing and programming the AT29C256? (incorrect configuration is a real possibility) Yes
    Was the AT29C256 correctly installed in the Burn 2 when programming the chip? (backwards installation is a real possibility) Yes
    Was the AT29C256 correctly indexed in the Burn 2 when programming the chip? The Burn 2 is capable of programming chips with 32 pins. (incorrectly indexing the chip into the Burn 2 is a real possibility) Yes

    Moates.net support link for the G1: http://support.moates.net/g1/

    dave w
    Here's a pic of the setup. Marked yellow on the notches so you can see them a little better. The only thing not showing is the MEMCAL installed on the G1, it's back in the car - but I know it was installed and right, it's the only thing that was working (Cold start and LH)
    Attached Images Attached Images
    Last edited by doc_rock; 05-26-2020 at 09:35 PM.
    1990 F-Bomb
    355 urethane mounted noisemaker
    LT4 Roller Top end
    Some sort of cam
    vette stopping stuff
    4th gen rear
    headers that belong in a trash can
    some other unimportant things
    +15hp steering wheel and wheels combo

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