Engine swap: 94 to 97 STS

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Cadillac Seville / Cadillac Eldorado Forum Discussion, Engine swap: 94 to 97 STS in Past Cadillac Vehicle Discussion; Thinking about doing this, if its possible. The 94 has a lot lower k's. My 97 still has lots of ...
  1. #1
    ponyboyt is offline Cadillac Owners Enthusiast
    Automobile(s): 97, 97, RIP 98, 99 STS with Jakes studs
    Join Date
    Apr 2009
    Ontario, Canada

    Engine swap: 94 to 97 STS

    Thinking about doing this, if its possible. The 94 has a lot lower k's. My 97 still has lots of power and gets good mileage (30+ mpg hiway) but its burning oil (maybe a litre every 1000 km... i do NOT baby this car) and sounds very ill. About to roll 300,000 km on the 97. The 94 has a rebuilt trans with less than 10,000 on it. Was actualy thinking about a rebuild on the 94, drive the 97 til it pukes and maybe swap in a 'fresh' engine. I'm confident the 97 will last the summer if i keep the oil topped up, that gives me lots of time to play with the 94 once its out.

    Question is.... are there any major differences that will prevent the swap? Im hoping majority of electrical, harness etc.. will be kept from the 97. Just drop the 94 engine in and plug it all in? (that is... not drop, but raise it in? from under the car heh.. )

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: Engine swap: 94 to 97 STS

    The 94 models use OBD-I diagnostic and data transmission protocol, while 96 and later use the OBD-II. I don't think the two drivetrains/car controls are electrically or data compatible.

  4. #3
    rabbit_man is offline Cadillac Owners Member
    Automobile(s): 1994 eldorado
    Join Date
    Nov 2009

    Re: Engine swap: 94 to 97 STS

    I was wondering the same thing, but reversed. I have a 94 eldorado that i would like to upgrade to the OSD2 diagnostic, is it possible without replacing everything and being a lot more trouble than it is worth?

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