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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 is now installed with ecm coolant temp and manifold heater.



    01/06/19 edit updated
    Currently installed
    L6 250 stock head & block
    Clifford 6=8 square bore intake
    Clifford 6=8 exhaust headers down into a single 2" pipe
    1984 chevy l6 ecm controlled ca emmissions distributor
    Boyd welding 18 gal tank with aeromotive phantom 200 in tank fuel pump
    91 Astro parts
    * Chopped wire harness
    * Ecm (stock)
    * Tbi w/ tps - iac
    * O2 sensor
    * Coolant sensor
    * Oil pressure sensor/gauge
    * Knock control mod/knock Sesor
    * Fuel pump relay
    Last edited by r.e.c.enthusiasts; 03-20-2019 at 02:13 AM.

  2. #2
    Fuel Injected!
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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
    CHEVROLET C20 PICKUP 1983-1986
    CHEVROLET C30 PICKUP 1985-1986
    CHEVROLET C50 1985-1986
    CHEVROLET C60 1985-1986
    CHEVROLET G10 1983-1984
    CHEVROLET G20 1983-1984
    CHEVROLET G30 1983-1984
    CHEVROLET K10 PICKUP 1983-1984
    CHEVROLET K20 PICKUP 1985-1986
    CHEVROLET K30 PICKUP 1985-1986
    CHEVROLET P20 1985-1986
    CHEVROLET P30 1985-1986
    CHEVROLET P40 1985-1986
    GMC C1500 PICKUP 1983-1984
    GMC C2500 PICKUP 1983-1986
    GMC C3500 PICKUP 1985-1986
    GMC C5000 1985-1986
    GMC C6000 1985-1986
    GMC G1500 1983-1984
    GMC G2500 1983-1984
    GMC G3500 1983-1984
    GMC K1500 PICKUP 1983-1984
    GMC K2500 PICKUP 1985-1986
    GMC K3500 1985-1986
    GMC P2500 1985-1986
    GMC P3500 1985-1986
    GMC P4500 1985-1986

  7. #7
    Fuel Injected!
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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
    Fuel Injected!
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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
    Fuel Injected!
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    When/where. Ive searched pnp rancho, sacramento, roseville. To no avail

  11. #11
    Fuel Injected!
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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 04:47 PM.

  12. #12
    Fuel Injected!
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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
    Fuel Injected!
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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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