425 engine w/ 454 TBI program?
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500, 472, 425, 368 Discussion, 425 engine w/ 454 TBI program? in Cadillac Engine Technical Discussion; Hey all, nice forum you have here. I am not going to lie to anyone here, I'm a dedicated Jeep ...
  1. #1
    jaber is offline Cadillac Owners Member
    Automobile(s): '79 425 engine/'75 Jeep
    Join Date
    May 2010
    Posts
    4

    425 engine w/ 454 TBI program?

    Hey all, nice forum you have here.
    I am not going to lie to anyone here, I'm a dedicated Jeep fan. I own 13 Jeeps in various states of restoration. With that many, I am in the need for something that can haul these around from time to time.
    A friend gave me the 425 and TH400 out of his '79 Fleetwood and I descided to drop it into a truck. I then took the TBI off an '87 Suburban and wired it all up.
    WOW, what a monster!!!!
    The problem I'm having is the programing of the ECM. Its a 7747 ECM and the 454 tune is only getting 8 MPG.
    Has anyone else done this yet? I'm sure I'm not the first and was wondering if someone has created a tune for this already? I am using Tuner Pro R/T and having a hard time figuring out the programming for this.

    Thanks in advance for any help....

    Jeff.

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  3. #2
    jaber is offline Cadillac Owners Member
    Automobile(s): '79 425 engine/'75 Jeep
    Join Date
    May 2010
    Posts
    4

    Re: 425 engine w/ 454 TBI program?

    Oh, and heres some pics...






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