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Thread: Trade a 1227727 Corvette and hardness for 1227730 and hardness:

  1. #1
    Fuel Injected!
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    Trade a 1227727 Corvette and hardness for 1227730 and hardness:

    Thanks to the great post below trade offer is over.

    Considering the current problems most likely for the best.

    Thanks Dave W you saved me a ton of work.

    Rich
    Last edited by Racprops; 04-03-2020 at 09:31 PM. Reason: New information made trade not needed.

  2. #2
    Super Moderator dave w's Avatar
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    The 93 G20 VAN computer can be modified and reprogrammed for a TPI engine. The 93 G20 VAN harness can be converted to a TPI harness, by removing the TBI injector connectors and splicing a TPI eight injector pigtail. The IAC and TPS might need a new pigtails also.

    The 1993 G20 VAN computer has more features and benefits that the 1227727 or 1227730 computer.

    dave w
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  3. #3
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    Major thanks for your help. I had been looking for such information. I thought I had seen something covering this years ago. But after a number of searches I had given up looking.

    Can you tell me more features and benefits??

    Rich

  4. #4
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    My 93 Van seems to be a odd man out, seems its PCM was a one year model, it is a 16186694PCM. Is there a better replacement? Seems to me such a one year model hints at a problem that was replaced the next model year.

    I do know I already had to replace it due to what I believed to be transistor output failure, and currently have two of them, I was carrying a replacement just incase.

    And for some reason I have had a number of the four legged modal under the small distributor cap fail on the road.

    I even upgraded to a MSD distributor and coil and still had failures, I rigged a 30 AMP relay near the distributor controlled by the key, and added a extra ground strap. I think it is fixed by this more positive power and ground connections, but worry it may come back.

    Any history on this problem?

    Rich

  5. #5
    Super Moderator dave w's Avatar
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    I think 16186694 PCM is an invalid number, because Google can't find it and RockAuto can't find it.

    The 1993 - 1995 PCM with Red / Blue Connectors can control either the electronic 4L60E transmission or electronic 4L80E transmission. The shift points are programmable with the electronic 4L60E and electronic 4L80E.

    The 1227727 and 1227730 were used with the non-electronic 700R4. The non-electronic 700R4 uses a TV Cable to help establish shift points.

    The 1993 - 1995 PCM with Red / Connectors has two fuel tables and two spark tables, Near Idle and Off Idle allowing better tuning / fine tuning for aftermarket engine performance parts.

    The 1993 - 1995 PCM with Red / Blue Connectors was used in Pickups, Vans, Suburbans, and S10 vehicles, making it low cost and easy to find.

    The 1993 - 1995 PCM with Red / Blue Connectors along with the 1227727 and 1227730 are neck and neck with a tremendous amount of aftermarket tuning software / hardware support.

    There is the option to upgrade the computer in the 93 G20 VAN to the 1993 - 1995 PCM with Red / Blue Connetors. Check out these internet article link were they upgraded PCM's https://www.thirdgen.org/forums/diy-...-its-time.html & http://www.gearhead-efi.com/Fuel-Inj...out-Directions!

    Maybe it's time to "Double Down" --- upgrade PCM and do the MPFI conversion for the WINNING HAND? (Poker Humor)

    dave w

  6. #6
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    Darn I transported a number IT is a16168625, please tell me about this PCM.

    OMG there is SO much...Thanks.

    That raises the following two questions: MAF and sequentially fired injection?? Just to have my cake and eat it too.

    I thing a good MAF it the most important one. MAF WITH MAP would be second.

    Rich

  7. #7
    Super Moderator dave w's Avatar
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    We have a Winner!

    The 16168625 can be upgraded to MPFI, using Speed Density (aka MAP Sensor). There is information available about using MAF with the 16168625. I do not have personal experience using a MAF with the 16168625. I have had very good results using the 16168625 upgraded to MPFI with the MAP only, so if it's not broke why fix it? The 16168625 converted to MPFI will be controlling the injectors in Bank Fire same way the 1227727 and 1227730 control the injectors.

    To have sequential fuel injection, MAF and MAP is possible, if your willing to increase the budget for some OBD2 hardware / software upgrades. Sequential fuel injection requires a Cam Position Sensor and Crank Position Sensor. The 1996 - 2000 Vortec 5.7 liter is sequential fuel injection with MAF and MAP. I would not venture converting an OBD1 engine to OBD2, because the overall performance gain doesn't justify the expense (in my opinion). The reason for sequential fuel injection, MAF, and MAP was for reduced emissions at idle. Engine performance was about the same, Sequential vs. Bank Fire.

    It's also possible to convert a TPI engine to sequential fuel injection, MAF, MAP and LS type coil pack ignition or Coil on Plug (COP).

    dave w

  8. #8
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    OK I need to ask what MPFI??

    Rich

  9. #9
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    Quote Originally Posted by Racprops View Post
    OK I need to ask what MPFI??

    Rich
    Having done the OBD1 to OBD2 0411 PCM swap multiple times. HUGE difference in the way the engine runs before and after. Coil per cylinder ignition can fire a very lean mixture at part throttle cruise.

  10. #10
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    So is the term MPFI means a OBDI to a conversion to a OBDII??

    A few concerns in my case is all the major rewiring in my van, and as I understand things at this point, the OBDII Systems are very hard to get into to do tuning were the OBDI systems are basically wide open.

    Also it seems much easily to enable the lean cruse system.

    Lastly I want to tune for MPG and think a PCM with so called learning systems could fight and remove improvements in MPG to suit its core programing, where I think a OBDI system might be less able to reprogram fuel settings.

    Rich



    Quote Originally Posted by Fast355 View Post
    Having done the OBD1 to OBD2 0411 PCM swap multiple times. HUGE difference in the way the engine runs before and after. Coil per cylinder ignition can fire a very lean mixture at part throttle cruise.

  11. #11
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    There are few questions to converting my Vans PCM to operate the TPI.

    I know of batch fires systems, they fire 4 injectors at a time. BUT I will need to know which four, as I understand it is two on one bank and two on the other bank per one branch of the batch.

    Are there any other things I might need to know?

    Rich

  12. #12
    Super Moderator dave w's Avatar
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    The TPI batch fire is wired for cylinders 1,3,5,7 and cylinders 2,4,6,8.

    dave w

    http://www.gearhead-efi.com/Fuel-Inj...8&d=1322074853

  13. #13
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    Sorry that seems wrong, that is all on one side and all on the other, I believe it is something like: 1,4,6,7 and then 3,2,8,5. Two on one bank and two on the other bank.

    I just don't know the pattern for a Chevy V8.

    Also it might be important which of the two TBI injectors are connected to which set of injectors but perhaps not?

    Rich

  14. #14
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    Dave is correct. Chevrolet engines have odd cylinder numbers on the left and even on the right. The banks of injectors are wired "left" and "right" or "odd" and "even."

    When thinking of fuel delivery it helps to understand the time between intake valve closing and the intake valve re-opening is often used to help vaporize fuel. There are multiple ways the injectors are triggered. Both banks of injectors can be triggered with every ignition pulse. Alternating banks banks of injectors can be triggered with every ignition pulse, or both banks can be fired independently of ignition pulses.

  15. #15
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    That makes sense, so what is the best for my 383??

    Rich

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