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Thread: What if

  1. #1
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    What if

    Ok! time for my first question, but first a little back ground info. I am working on my teenagers 1995,1500, 5.7 TBI converted to TPI. He did the conversion for looks and school project. The problem is the tune needs a little tweaking for cold idle (when the truck first cranks it will go dead, runs ok after warm) and idle when AC kicks on. I got a pcm from someone on another board that he made changes the pcm for 8 injectors instead of the two TBI injectors. I was suppose to receive the mask and bin files but never did. Now I can't get in touch with the guy to get the mask and bin in order to make any changes to the tune. The product was top notch as was the tune except for the minor issues listed above. Can I use any other mask or will I need that specific mask for that modded pcm? Not sure what to do, any advice greatly appreciated.

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    Fuel Injected! JeepsAndGuns's Avatar
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    What pcm are you running? I assume since its a 95 model truck, its a 16197427? From the sound of it, it has had the resistor mod done to it? If so, then what bin are you running, are you running a stock tbi bin file, or a MPFI modded bin?
    If the truck is stock and is a auto, then I assume its a 4L60E? If so then you will need to run a $0D bin file. If your running on a un modded tbi bin then thats gonna be your problem. There are several changes that need to be done to the bin to run the mpfi, as well as flow rate of your injectors. I am running a 7427 pcm converted to mpfi and if you need a bin file with the required changes to it to run mpfi, I can help you out there.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

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    RIP EagleMark's Avatar
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    Like Jeepsand Guns said it does sound like the 16197427 MPFI convrsion, all the info for it and masks are in the 16197427 info thread. Did the guy put a chip in the Memcal with bin on it to statr? With a burner you could read it and tweak it before starting from scratch.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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    Will the '7427 with the memcal mod (MPFI mod) and / or resistor mod run a Chevy TPI system (with the stock peak and hold injectors) ? I was always under the assumption that the injectors were of a different impeadance and could not be tied to the two on board injector drivers (4 per side) .

    I could be wrong , and it would be benificial if I was .

    TOM
    Last edited by Nasty-Z; 06-21-2012 at 06:03 PM.
    1994 3500 Dually , 502 (509) , 264HR , Edelbrock MPFI , PFI '7427
    1992 S-10 434 SBC/Tremec - '7427
    1986 Monte Carlo SS
    1984 S-10 , SAS, 496/700R4/205 , D44/14BFF -'7427
    1980 Z-28 496/700R4
    1979 Corvette 496/700R4
    1977 Olds 98 Regency 403/700R4

  5. #5
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    Thanks for the reply guys. When I get home from offshore I will get service number off the computer. The truck does have a 4L60E ( the reason we did not go with EBL). I bought the pcm from the guy and it was a plug and play, I still have the oem 7427 but is not being used. The pcm in the truck has a BJYK Memcal. I also have the Moates APU1 so I should be able to make changes. This was the teenagers project, he was the computer expert but decide to go off and see the world in the Navy. Now old dad has to clean up the mess... again! LOL!

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    Fuel Injected! jameslleary's Avatar
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    Quote Originally Posted by Nasty-Z View Post
    Will the '7427 with the memcal mod (MPFI mod) and / or resistor mod run a Chevy TPI system (with the stock peak and hold injectors) ? I was always under the assumption that the injectors were of a different impeadance and could not be tied to the two on board injector drivers (4 per side) .

    I could be wrong , and it would be benificial if I was .


    TOM
    Yes it will, There is a guy on the FSC forum that has run TPI with the 7427, as well as a MAF TBI setup. He did what is called the port mod when he was running the TPI, and IIRC, he just had a jumper wire installed in the memcal, no resister, and he ran the regular Bosch style injectors.

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    Quote Originally Posted by jameslleary View Post
    Yes it will, There is a guy on the FSC forum that has run TPI with the 7427, as well as a MAF TBI setup. He did what is called the port mod when he was running the TPI, and IIRC, he just had a jumper wire installed in the memcal, no resister, and he ran the regular Bosch style injectors.
    Must be Fast305 :)

    That is good to know , I have a couple of TPI setups left and it wouldbe good to use a '7427 rather than the '7165.

    I already run the'7427 with the MPFI mod in my Dually with the 502 and the Edelbrock injection and the Pico injectors , just wasn't sure if the '7427 would handle the OEM TPI peak and hold injectors .

    Thanks for the info.

    TOM
    1994 3500 Dually , 502 (509) , 264HR , Edelbrock MPFI , PFI '7427
    1992 S-10 434 SBC/Tremec - '7427
    1986 Monte Carlo SS
    1984 S-10 , SAS, 496/700R4/205 , D44/14BFF -'7427
    1980 Z-28 496/700R4
    1979 Corvette 496/700R4
    1977 Olds 98 Regency 403/700R4

  8. #8
    Fuel Injected! jameslleary's Avatar
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    That would be the guy! I wouldnt mind finding one of those Edelbrock manifolds with the EGR.
    How are those pico injectors working out for you?

  9. #9
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    Quote Originally Posted by jameslleary View Post
    That would be the guy! I wouldnt mind finding one of those Edelbrock manifolds with the EGR.
    How are those pico injectors working out for you?
    They work fine , I run the 44# injectors with the '7427 in MPFI mode.

    It was a long road when I first got the system , wiring the injectors like Edelbrock wanted you to (4 for each driver) and running the PCM in TBI mode resulted in a D/C so low the injectors would actually misfire once in a while , the idle was horrible and drivability was very inconsistent.

    Ken Cannata (HP tuners) helped me do the initial swap to MPFI mode and I haven't looked back , truck runs great ande it makes big power with the system.

    TOM
    1994 3500 Dually , 502 (509) , 264HR , Edelbrock MPFI , PFI '7427
    1992 S-10 434 SBC/Tremec - '7427
    1986 Monte Carlo SS
    1984 S-10 , SAS, 496/700R4/205 , D44/14BFF -'7427
    1980 Z-28 496/700R4
    1979 Corvette 496/700R4
    1977 Olds 98 Regency 403/700R4

  10. #10
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    OK guys...service no. 16197427 BTWX

    on the chip it has BJYK_$0D the pcm has been modded to run TPI. What exactly the mod was I don't know.

    I have been using Datamaster and winaldl to datalog. I tried to datalog with tunnerpro v5 with no luck. I think I need the right data stream file, not sure what that is or how to get it for this pcm being it has been modified. I guess the first step would be to work through the data logging problem?
    Last edited by mike327; 06-27-2012 at 03:40 AM.

  11. #11
    Fuel Injected! JeepsAndGuns's Avatar
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    I think you missed a number, should be 16197427.
    Probably has had the resistor mod done to it. Thats what I did to mine to run my MPFI. I did not have to mod my ADX file to be able to data log.
    So you will need the $0D ADX file, you can get it from the $0D thread here, or tunerpros website. Can also get the correct $0D XDF to make changes to your bin. If BJYK is on the chip, most likely thats what bin was modded.
    Do you have any way to read your chip? You may want to look at it and make sure all the needed changes have been made to run mpfi, also there was a jumper wire that should have got sodered into the memcal. There is a zip file on this site somewhere with all the required info for changing to mpfi. Hopefully mark can point you to it. If not I can upload it.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

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    RIP EagleMark's Avatar
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    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  13. #13
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    You are correct! I added the 9 so maybe it will not cause problems in the future if someone else reads this. Ok found the adx file maybe I can data log when I get back on land again.
    Thanks

  14. #14
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    Somebody has compiled a LOT of info on this site, makes my old head hurt.

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