Occasional vibration/stumble
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5.0 and 5.7 Discussion, Occasional vibration/stumble in Cadillac Engine Technical Discussion; Hello, my 86 Fleetwood drives like a dream but from time to time i get the following problem: If i ...
  1. #1
    rollerball is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    Occasional vibration/stumble

    Hello,

    my 86 Fleetwood drives like a dream but from time to time i get the following problem: If i cruise at a higher speed (65 mp/h) and then let off the gas to lose speed down to a lower speed (30 mp/h) and then step on the gas again sometimes the engine/transmission starts to vibrate/stumble. It feels as if the transmission is still locked in overdrive so that the engine has to try to move the car at a much too low rpm. But maybe it is something else - this is only my guess. Maybe it is a carb issue? I have read the thread about the problem with the engine dying after a curve and i must say that this also happened twice after i made a sharp turn at higher speed (highway offramp)

    It does it only from time to time but often enough to make me worry...

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  3. #2
    90Brougham350's Avatar
    90Brougham350 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 FWB, 93 SDV, 94 FWB (sold), 90 Brougham (sold)
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    Re: Occasional vibration/stumble

    Yup, that's the torque converter solenoid in your transmission. You need a new one. It's not letting the locking torque converter unluck when you hit the gas.

  4. #3
    ChiTDI is offline Cadillac Owners Member
    Automobile(s): '86 Brougham
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    Mar 2004
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    Re: Occasional vibration/stumble

    This may help. I haven't done it yet, but spring is coming.
    http://www.montecarloss.com/TCC_Sole...tml#Definition

  5. #4
    rollerball is offline Cadillac Owners Member
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    Thread Starter

    Re: Occasional vibration/stumble

    Thank you guys! Is this a common problem? Shouldnīt it happen all the time and not only from time to time? I am no mechanic so i doubt my own diagnosis. I talked to a dealers mechanic today and he guessed that it could be an ignition problem....

  6. #5
    90Brougham350's Avatar
    90Brougham350 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 FWB, 93 SDV, 94 FWB (sold), 90 Brougham (sold)
    Join Date
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    Re: Occasional vibration/stumble

    When it begins to fail, I would imagine it would work sometimes still, when it fails completely, you'll know.

  7. #6
    rollerball is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    Thread Starter

    Re: Occasional vibration/stumble

    There is one thing that makes me doubt that it is the torque converter: The car only begins to stumble when i get back on the gas. If the converter was locked it would start to vibrate as soon as a certain low speed ist reached wich makes it hard for the engine to still run in such a high gear. I will take it to the daler on monday. Letīs hope it is only a minor issue.

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