NOOB needs some help!!... northstar blown!!!
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Northstar Engines and System Technical Discussion Discussion, NOOB needs some help!!... northstar blown!!! in Cadillac Engine Technical Discussion; hey guys, this is my first post so i would really appreciate all your imput. my 1994 STS had 147k ...
  1. #1
    1994transam is offline Cadillac Owners Member
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    Question NOOB needs some help!!... northstar blown!!!

    hey guys,

    this is my first post so i would really appreciate all your imput.

    my 1994 STS had 147k on it, i beat the car everyday for a year... like 30k miles per year... anyways.... my mom took my car to go get some food and when she started the car it broke.

    so far, i cant tell but i think its fatal. i have a 94 TA with a 383 and i know that if i ever herd this sound in my car i'd replace the engine!!!

    i cant get to to engine very well because its in the car, i'm gonna pull it but heres the catch!!!


    i found a 95 SLS 52k and matching tranny. comes with everything for 650$

    i dont care so much about preformance, since its my winter car..

    i understand that the cams are different, and the head/intake bolt patteren is also different, but its ODB1 so it should go in right? no wiring harness problems?



    RECAP: will a 95 SLS engine and tranny go into a 94 STS?, what problems will i encounter.... i'm not worried about pulling the engine, thats easy

    what should i change to make the SLS run good besides tune up... i was thinking a ODB1 SLS pcm.... that way i dont load the car up with fuel!!

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    STS 310's Avatar
    STS 310 is offline Cadillac Owners Connoisseur
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    Re: NOOB needs some help!!... northstar blown!!!

    The vin y engine of the SLS does not work well with the STS and the final gearing of the tranny. The PCM might have some issues as well, someone else will be able to go into more detail.

    I do know that you will need a compatible vin 9 engine.

  4. #3
    mcowden is offline Cadillac Owners Connoisseur
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    Re: NOOB needs some help!!... northstar blown!!!

    Quote Originally Posted by 1994transam
    hey guys,

    this is my first post so i would really appreciate all your imput.

    my 1994 STS had 147k on it, i beat the car everyday for a year... like 30k miles per year... anyways.... my mom took my car to go get some food and when she started the car it broke.

    so far, i cant tell but i think its fatal. i have a 94 TA with a 383 and i know that if i ever herd this sound in my car i'd replace the engine!!!

    i cant get to to engine very well because its in the car, i'm gonna pull it but heres the catch!!!


    i found a 95 SLS 52k and matching tranny. comes with everything for 650$

    i dont care so much about preformance, since its my winter car..

    i understand that the cams are different, and the head/intake bolt patteren is also different, but its ODB1 so it should go in right? no wiring harness problems?



    RECAP: will a 95 SLS engine and tranny go into a 94 STS?, what problems will i encounter.... i'm not worried about pulling the engine, thats easy

    what should i change to make the SLS run good besides tune up... i was thinking a ODB1 SLS pcm.... that way i dont load the car up with fuel!!

    Something doesn't sound right: Your mom just started the car and it "broke." What noise is it making? Before you go swapping motors, let the folks here help you diagnose what's wrong. It might be fixable for less expense and trouble than swapping with an incompatible engine. Just my 2 cents worth...
    Mike

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    Re: NOOB needs some help!!... northstar blown!!!

    Welcome to the forum.

    Do a search on here using the search funtion top left.

    I recall reading somewhere about PCM incompatibilities regarding these engines.....forgot the details.

    Try to find an STS or Deville Concourse somewhere.

    Good luck

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    powerglide's Avatar
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    Re: NOOB needs some help!!... northstar blown!!!

    heres someone selling an sts cheap
    http://www.cadillacforums.com/cadill...1&cat=3&page=1

    not sure if its compatible though.....just thought I'd point it out

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    STS 310's Avatar
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    Re: NOOB needs some help!!... northstar blown!!!

    Quote Originally Posted by powerglide
    heres someone selling an sts cheap
    http://www.cadillacforums.com/cadill...1&cat=3&page=1

    not sure if its compatible though.....just thought I'd point it out
    That isnt even a N* engine it is a 4.9

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    Re: NOOB needs some help!!... northstar blown!!!

    d'oh...

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    zonie77 is offline Cadillac Owners Connoisseur
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    Re: NOOB needs some help!!... northstar blown!!!

    I didn't save any but there are a few threads that mention what engines interchange. The intakes changed dramatically in 95 I think.

    The gearing is different. The 300hp has 3.7 and the 270hp has 3.1. The 270hp with the 3.7 gears would give you great bottom end.

    Someone way back did a major amount of work and got a newer (like 2000)engine to work but it required a LOT of custom work.

  10. #9
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    Re: NOOB needs some help!!... northstar blown!!!

    Actually a SLS (Y) engine will work fine in a STS (9), I was exploring this option some time back and the resident cadillac engineer at the time said that it would work - in a maf system the engine would notice the different airflows and adjust accordingly. I have done some searching online and it does appear that the swap has been done. The only trouble would be if the 94 uses a MAP system, I think.

    This combination is used on the Bonneville GXP, only the exhaust ports on the heads are different I think.

    If you want to avoid potential headaches, however, stick with the STS setup.

  11. #10
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    davesdeville is offline Banned
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    Re: NOOB needs some help!!... northstar blown!!!

    94 and 95 use a speed density system with a MAP sensor.

    The big issue is that Vin 9 engines had 3.71 FDR and Vin Y had 3.11s so you'd need to work the PCM to adjust the shift points whether you use the 94 9 PCM or the 95 Y PCM. Not sure of anyone who will do this for you.

  12. #11
    1994transam is offline Cadillac Owners Member
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    Re: NOOB needs some help!!... northstar blown!!!

    i'm installing a sls powertrain though... so i'm not even going to use the vin 9 tranny...

    sls tranny + sls engine = good(what i plan on doing)
    sls tranny + sts engine= bad
    sts tranny + sls engine= good(sts tranny has 147k, cant see using this setup)

    if the sts harness will hook up, i'm not going to have a problem.... reguardless... i have a 94 sls computer with harness also.....


    i just wanna know if everythings gonna hook up, after all its all ODB1 and the same pcm is used from 93-95 so

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    1994transam is offline Cadillac Owners Member
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    Re: NOOB needs some help!!... northstar blown!!!

    so guys,

    whats the verdict.....

    should i grab a sls computer for the swap or just let the STS ecm figure it out?

  14. #13
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    Re: NOOB needs some help!!... northstar blown!!!

    I think you will need a sls computer with that setup since the STS computer will notice that the gear ratios are off and start throwing codes.

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    Re: NOOB needs some help!!... northstar blown!!!

    Correct me if I'm wrong, but I think you are talking about needing the correct EEPROM (chip), not the computer. I think the computer is the same for all OBDI years.

  16. #15
    1994transam is offline Cadillac Owners Member
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    Re: NOOB needs some help!!... northstar blown!!!

    i did the swap, no problems other than i need a sls pcm...

    i'll fill ou guys in on everything

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