Bringing TBI and Multi Port Fuel Injection to a New Level.     EFI Conversions and Tuning! Seattle to Portland! E-mail Tuning Consultant!
Results 1 to 15 of 66

Thread: Another Conversion

Hybrid View

  1. #1
    Fuel Injected!
    Join Date
    Mar 2017
    Age
    36
    Posts
    35

    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
    Fuel Injected!
    Join Date
    Feb 2013
    Location
    Euless, TX
    Posts
    1,467
    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!
    Join Date
    Mar 2017
    Age
    36
    Posts
    35
    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
    Administrator
    Join Date
    May 2011
    Location
    Lakes Region, NH
    Age
    48
    Posts
    2,794
    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!
    Join Date
    Mar 2017
    Age
    36
    Posts
    35
    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
    Join Date
    Feb 2011
    Posts
    3,401
    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!
    Join Date
    Mar 2017
    Age
    36
    Posts
    35
    Quote Originally Posted by Fast355 View Post
    Also you need to make sure you have a 4.3 prom chip, netres pack and injectors to start with.
    Okay.. Im not sure exactly what you mean there... I pulled the entire rig from a 91 astro van minus the dizzy that is coming

  8. #8
    Fuel Injected!
    Join Date
    Mar 2017
    Age
    36
    Posts
    35
    Okay! So I got my bran spankin new dizzy from summit. Put some new fuel in the new tank. Cranked over. Its is alive!!!! Still slightly rich. Vac is at apps 12-13 " hg.what is idle supposed to sit at timing wise w spout thing unplugged?

    Okay so ive got it set at 4 btdc. Running slightly rich. Still have to wire in that thing that the knock sensor is wired into power wise i think. The vac is sitting at 13 ish vac. Its running pretty darn well. Have to redo the tbi unit as its leaking a little. I hear this high pitched wine in the engine bay. Still need to plug the vac line from the distributor with a cap as its got a hose with screw driver in it at the moment. Think i need a thicker gasket under the carb adapter plate so i can better fit hoses and such on the tbi unit. There was another vac unit in the loom that has some 3 inlet outlet pipes. Not sure if those are needed or not to boost vac at idle or if my idle issue is purely a leak... Let me know and ill keep posted as i go along.


    Ohh... My oil pressure light is on... Did i hook up wrong wire?

    And how do i tell what my coolant temp is now? Had a mechanical sender....

    Hmm. Looks like i may have to set the timing at 0* if im reading this right.
    Last edited by r.e.c.enthusiasts; 07-17-2017 at 07:46 AM.

  9. #9
    Fuel Injected!
    Join Date
    Mar 2017
    Age
    36
    Posts
    35
    Okay, so i now have the knock sensor and esc installed. Only found 2 vac leaks. Fixed both. Fixed fuel leak at the injector. Its still slightly rich i think. Vac is at 15 cold down to 13 idle hot.... It also has a minor sputter at idle. It is running way better though. However i fear i may have to have the engine reworked. Also does any body have the lower thermostat housing with wet sensor hole?

  10. #10
    Fuel Injected!
    Join Date
    Mar 2017
    Age
    36
    Posts
    35
    So.. Any body here have a 68-72 c10 with a l6 250(or 30 -92) tbi setup? Id love to see some pics with how you did your wiring...

Similar Threads

  1. TBI conversion.
    By scottsrc in forum Introductions
    Replies: 5
    Last Post: 01-23-2015, 11:37 AM
  2. 24X LT1 Conversion
    By MYLTWON in forum OBDII Tuning
    Replies: 0
    Last Post: 12-28-2014, 08:32 AM
  3. 4A-GZE conversion
    By ericjon262 in forum GM EFI Systems
    Replies: 16
    Last Post: 11-23-2014, 07:37 PM
  4. s-10 283 tbi conversion
    By hammertime371 in forum GM EFI Systems
    Replies: 30
    Last Post: 09-14-2014, 08:26 PM
  5. My First EFI Conversion
    By EagleMark in forum GM EFI Systems
    Replies: 1
    Last Post: 09-18-2011, 06:00 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •