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Thread: Another Conversion

  1. #1
    Fuel Injected!
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    Another Conversion

    Okay, So I am working on a GM L6 250 fairly stock. it has a GM HEI dizzy. lol
    So, I have the TBI installed w adapter plate. it has a TPS - IACV - MAP all hooked up, I also have the o2 sensor installed, coolant temp switch, oil switch. Fuel Pump relayed... So here is the deal.
    running all hooked up.. It don't. but will throw code 32. disconnect iac, tps, map. it runs, and is rich as crap! however if I run all connected on 1 injector it will barely start but will start... any body do one of these fuel only swaps? or is there a car that I can rip the dizzy from that will actually FIT my dizzy port that is esc?

    Serv No 16144288 AUMJ
    Prom AUMJ 1278
    bottom of prom is
    JT8(G)/J6/P
    LFIVN960
    AE03

    Figure id post some pics of the project as it stands




    And this will eventually be added for the ecu temp so i canuse the one in the head for gauge temp.
    Last edited by r.e.c.enthusiasts; 08-20-2017 at 11:47 AM.

  2. #2
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    Quote Originally Posted by r.e.c.enthusiasts View Post
    Okay, So I am working on a GM L6 250 fairly stock. it has a GM HEI dizzy. lol
    So, I have the TBI installed w adapter plate. it has a TPS - IACV - MAP all hooked up, I also have the o2 sensor installed, coolant temp switch, oil switch. Fuel Pump relayed... So here is the deal.
    running all hooked up.. It don't. but will throw code 32. disconnect iac, tps, map. it runs, and is rich as crap! however if I run all connected on 1 injector it will barely start but will start... any body do one of these fuel only swaps? or is there a car that I can rip the dizzy from that will actually FIT my dizzy port that is esc?
    Some of the california chevy trucks and vans around 1982-1984 had a EST distributor for the computer controlled carbs. Also you need to make sure you have a 4.3 prom chip, netres pack and injectors to start with.

  3. #3
    Fuel Injected!
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    when I pulled the first one, the base shaft and gear was appx 1/4 too wide to even fit into the dizzy which is why I ask... on another note. currently it has a new map and a new iac v. it started up immiadiatly after sitting for a few hours but stayed at 500 rpm's. ill pull the cover off the ecu to see what it has.

  4. #4
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    It sounds like the combintaion may be getting too much fuel. The injectors and calibration should be from a similarly sized engine.

    Without the timing control you're missing half the benefit of an ecm. What year 250 do you have? Are you using a GM HEI or aftermarket? Could you install a 7 pin ESC module instead of the 4 pin version?

  5. #5
    Fuel Injected!
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    The donor vehicle was the 1991 chevy astro van 4.3l V6 for the ecu tbi harness sensors. my dizzy is a big cap GM HEI also pulled from another car years ago and it works a LOT better than the old points it had on there. and the 250 I believe is from a early 75 chevy nova (non intergral head)

  6. #6
    Super Moderator dave w's Avatar
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    The CALIFORNIA EMISSION vehicles listed below with a 4.1 / 250 engine should have the 7 pin HEI / WITHOUT VACUUM ADVANCE distributor. AC Delco part # 88864755 or A1 Cardone part # 30-1677 ( https://www.summitracing.com/parts/aaz-30-1677 ).

    dave w


    CHEVROLET C10 PICKUP 1983-1984
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    CHEVROLET C50 1985-1986
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    CHEVROLET G10 1983-1984
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    CHEVROLET K10 PICKUP 1983-1984
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    GMC P4500 1985-1986

  7. #7
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    Okay. So ive searched a boat load for that distributor... With one on back order to no end... Does any body have a suggestion of a used one i could buy or a place to send mine to be re designed to work properly?

  8. #8
    Super Moderator dave w's Avatar
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    Quote Originally Posted by r.e.c.enthusiasts View Post
    Okay. So ive searched a boat load for that distributor... With one on back order to no end... Does any body have a suggestion of a used one i could buy or a place to send mine to be re designed to work properly?
    I was able to locate and purchase a used 1983 / 84 C-10 I-6 HEI distributor (without vacuum advance) from a CALIFORNIA salvage yard.

    dave w

  9. #9
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    I just looked at RockAuto and they show the AC Delco unit p/n 88864755 available.

    http://www.rockauto.com/en/catalog/c...stributor,7108

  10. #10
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    When/where. Ive searched pnp rancho, sacramento, roseville. To no avail

  11. #11
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    Quote Originally Posted by Eds View Post
    I just looked at RockAuto and they show the AC Delco unit p/n 88864755 available.

    http://www.rockauto.com/en/catalog/c...stributor,7108
    Yep. Try the order button. It gets removed from cart.


    Ohh wait!!! Its avail now!!! Wth. Thank you!!!


    ... And now i get the email that says..

    We are sorry to tell you our inventory records were incorrect and some items you ordered are out of stock
    Last edited by r.e.c.enthusiasts; 06-19-2017 at 06:47 AM.

  12. #12
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    For rockauto thats been the case every time on that part only. Never had an issue with any other part from them yet.

    Autozone says same orielly same napa same

  13. #13
    Super Moderator dave w's Avatar
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    Quote Originally Posted by r.e.c.enthusiasts View Post
    When/where. Ive searched pnp rancho, sacramento, roseville. To no avail
    Dorris Auto Wreckers Hayward CA, 12/30/15

  14. #14
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    Yup. No luck there.

  15. #15
    Super Moderator dave w's Avatar
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    Try DAVE's small-body HEI's (someone else with the same name Dave) : http://www.davessmallbodyheis.com/

    He's helped me with older Jeep points distributors to EFI conversions.

    dave w

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