Jolt ehen accelerating
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Cadillac STS-V Series Forum Discussion, Jolt ehen accelerating in Cadillac V-Series Forums; Just yesterday driving home from work I noticed a jolt when I accelerate, like the transmission is slipping. Do you ...
  1. #1
    dl72 is offline Cadillac Owners Fanatic
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    Jolt ehen accelerating

    Just yesterday driving home from work I noticed a jolt when I accelerate, like the transmission is slipping. Do you think it is a broken motor mount? Car runs fine. No messages, etc. thanks is advance

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    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Jolt ehen accelerating

    Not sure what it might be. Not likely to be a broken motor mount.

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    boomys10 is offline Cadillac Owners Enthusiast
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    Re: Jolt ehen accelerating

    i have a similar (i think given the vague description) when my belt slips. the car sounds like its moving but doesnt then "catches" and lunges forward. you would knw if its the tranny slipping.

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    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: Jolt ehen accelerating

    Do you have a CAI on the car? I get this often with my Spectre. It's the TCC solenoid locking up the converter based on signal inputs from around the engine/car, one of those is from the MAF (calculated load values, etc, that it uses based on inputs from the MAF... But I'm not a tuner, so....), as such, with all the extra amount of air coming in with the Spectre, the MAF isn't always spot-on with it's calculation vs. reality (inputs from other sensors), and it slams/jolts hard upon initial acceleration, say from a slow roll (like turning a corner or something).

    When it start happening, I put the car into an idle re-learn, and go from there. I also clean my MAF frequently, just incase to make sure it is metering properly.

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    dl72 is offline Cadillac Owners Fanatic
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    Quote Originally Posted by CMNTMXR57
    Do you have a CAI on the car? I get this often with my Spectre. It's the TCC solenoid locking up the converter based on signal inputs from around the engine/car, one of those is from the MAF (calculated load values, etc, that it uses based on inputs from the MAF... But I'm not a tuner, so....), as such, with all the extra amount of air coming in with the Spectre, the MAF isn't always spot-on with it's calculation vs. reality (inputs from other sensors), and it slams/jolts hard upon initial acceleration, say from a slow roll (like turning a corner or something).

    When it start happening, I put the car into an idle re-learn, and go from there. I also clean my MAF frequently, just incase to make sure it is metering properly.
    No CAI. Everything is stock.

    ----------

    Quote Originally Posted by boomys10
    i have a similar (i think given the vague description) when my belt slips. the car sounds like its moving but doesnt then "catches" and lunges forward. you would knw if its the tranny slipping.
    I don't think it is the belt slipping. It jolts and the RPM's go up a bit then back down.

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    boomys10 is offline Cadillac Owners Enthusiast
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    Re: Jolt ehen accelerating

    then it would be the tranny slipping. if i remember correctly in the 6l80s 1-3-5 are known to go out.

  8. #7
    dl72 is offline Cadillac Owners Fanatic
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    Quote Originally Posted by boomys10
    then it would be the tranny slipping. if i remember correctly in the 6l80s 1-3-5 are known to go out.
    Ok. Thanks. I guess I will get it looked at.

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    dl72 is offline Cadillac Owners Fanatic
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    Do you think changing the transmission fluid would help?

  10. #9
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Jolt ehen accelerating

    Quote Originally Posted by boomys10 View Post
    then it would be the tranny slipping. if i remember correctly in the 6l80s 1-3-5 are known to go out.
    Sounds like it. The 3-5-R clutch pack is the weakest. That's what went on mine.

    Quote Originally Posted by dl72 View Post
    Do you think changing the transmission fluid would help?
    Only if it is low now. Check the level.

    See if you can get a video of it happening.

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    boomys10 is offline Cadillac Owners Enthusiast
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    Re: Jolt ehen accelerating

    how much was your rebuild?

  12. #11
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Jolt ehen accelerating

    My first rebuild was $1050 with me dropping the trans off at the shop. That was all new clutches with including upgraded Alto clutches in the 3-5-R and 4-5-6 drums.

    That didn't last. The builder didn't put enough clearance in the 3-5-R pack and it burned up. Clutches were warrantied and I installed them with the proper amount of clearance.

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