speedometer and shifting problem

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Cadillac Allante Forum Discussion, speedometer and shifting problem in Past Cadillac Vehicle Discussion; Hey there, I have a 89 allante, and when my car is cold in the mornings it has been acting ...
  1. #1
    slopoke is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Oct 2007

    speedometer and shifting problem

    Hey there, I have a 89 allante, and when my car is cold in the mornings it has been acting funny. when i start going down the road the speedometer will read normally for a second then drop to 0 mph then back up to say 35 (which is about what i am doing) then drop back to zero. as the speedometer is dropping to 0 then back to 35, the car shifts accordingly. so say i am doing 35 and its in 3rd gear, the speedo drops to 0 and the car downshifts to first, when it reads 35 again it shifts back to 3rd. it will do this for the first 5 mins of driving then the rest of the day its normal.
    So my thoughts were if the speed sensor was maybe bad it could be sending wrong readings and do this. or could it be something else??? any help is greatly appreciated.
    Thank you

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
    Join Date
    Sep 2010
    East Boston MA.
    Have your codes pulled. Some parts stores will do this for free, Auto Zone for instance. Post any codes you may have, AND THEIR DEFINITIONS, here.

    Here's a list of OBD I code definitions:

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