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Thread: 1993 STS shifting problems.

  1. #1
    JCrease is offline Cadillac Owners Member
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    1993 STS shifting problems.

    Hi Cadillac family! My 1993 cadillac sts just started shifting weird. When i start it up and put it into reverse its fine. I start diving and it shifts fine until the check engine light comes on. If i'm already in a gear it will stay in the gear that i'm in. when i stop and start going again it wont shift out of first or second. I have to turn off the car and restart it to get it to shift properly. Like I said it shifts like butter until the check engine light comes on. What could this be?


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  3. #2
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: 1993 sts Shifting problems. Cadillac Family I need your help

    Check your DTC's according to the sticky thread on this forum, post the codes and definitions, although I bet that you will return with shift solenoid codes. Earlier 4T80E's had problems with shift solenoids and now the "updated' solenoids come with a bracket.

  4. #3
    amunderdog is offline Cadillac Owners Connoisseur
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    Re: 1993 sts Shifting problems. Cadillac Family I need your help

    We had one of ours do that once.
    Are you waiting for the systems to wake up when you go to start the vehicle?
    A good rule of thumb.
    Turn key to run - wait for it to cycle thru the systems - then start.
    Usually if you get in and turn the key on; by the time you get your seatbelt on and get comfortable it will be ready to start.

  5. #4
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Nothing needs to "wake up", you can start the car immediately, everything is "ready" as soon as you are.

  6. #5
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 1993 STS shifting problems.

    I start diving and it shifts fine until the check engine light comes on
    the CHECK ENGINE light comes on as the RESULT of a problem -
    not the CAUSE of the problem -

    check for Diagnostic Trouble Codes -
    if you don't know how - go here and read the ENTIRE post -

    http://www.cadillacforums.com/forums...odes-dtcs.html

    if you have any codes - post them here -
    ALONG WITH THEIR DEFINITIONS -

    I expect to find a code related to a failed shift solenoid -

  7. #6
    amunderdog is offline Cadillac Owners Connoisseur
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    Re: 1993 STS shifting problems.

    Quote Originally Posted by MoistCabbage View Post
    Nothing needs to "wake up", you can start the car immediately, everything is "ready" as soon as you are.
    I respect that; but disagree.
    My experience has been
    These old OBD 1 and OBD 1.5 cars can do some strange things if you you do not give them time to cycle thru the system checks.

  8. #7
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    How many people do you know that turn the key to on, wait several seconds, and then start the engine? I've never seen or heard if anyone doing that. I think with hundreds if thousands of OBD I vehicles in operation, we'd have heard something about this problem, or there'd be something about it in the owners manual.

  9. #8
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 1993 STS shifting problems.

    Quote Originally Posted by amunderdog View Post
    I respect that; but disagree.
    My experience has been
    These old OBD 1 and OBD 1.5 cars can do some strange things if you you do not give them time to cycle thru the system checks.
    -----------------------
    have you ever checked for codes with the engine running?
    of course you have -

    while going through the code check -
    have you ever felt even a "bump" in the engine?
    probably not -

    would you consider the "system check"
    and "pulling codes" - ie - scanning the computer -
    a somewhat similar intrusion/operation?

    does this change your view?

  10. #9
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1993 STS shifting problems.

    Quote Originally Posted by MoistCabbage View Post
    How many people do you know that turn the key to on, wait several seconds, and then start the engine? I've never seen or heard if anyone doing that. I think with hundreds if thousands of OBD I vehicles in operation, we'd have heard something about this problem, or there'd be something about it in the owners manual.
    AND, no manufacturer would ever design a car like that. They know very well that most people just insert key, start the car and go (as fast as possible).

  11. #10
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
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    Re: 1993 STS shifting problems.

    I've said it & heard it before:
    Does your speedo stop working when this happens?
    Check for VSS code.
    Broken solenoid is usually BROKEN all the time.
    Last edited by Aztec ETC ECS; 05-20-13 at 09:21 PM.

  12. #11
    amunderdog is offline Cadillac Owners Connoisseur
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    Re: 1993 STS shifting problems.

    No 20years ago they were not designed that way.
    It was what they had at the time.
    Time has a way of slowing things down.

    I was just reporting my observations and experience.
    It does not cost anything to try. You should put your seabelt on anyway

  13. #12
    gallivan7 is offline Cadillac Owners Member
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    Re: 1993 STS shifting problems.

    My caddy has 244,000 miles on it, and I always wait for the Monitored Systems OK to complete before starting. During the winter in Chicago area, the BCM will lock out sometimes and no gauges will work till it gets well warmed up. No manufacturer would design a car like that, but sometimes thats what they do. Maybe being a British motorcycle owner makes me feel this way, but so be it.


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