Question about 1993 Buick Park Avenue

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Over drive goes into drive and stayes there also pulses on hills befor down shift

1993 trasmision pules climing small hills and then down shifts .also will slip out of over drive into drive and sta there. what could it be.

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  • alexandrabob Apr 21, 2009

    yes it does slip out going down hills and stayes in drive .I move into drive no change , i move it into overdrive rpm stays the same as drive

  • Joe Dynamo
    Joe Dynamo Apr 21, 2009

    I have owned two 1993 Buick Park Avenues with the standard 4 speed automatic overdrive transmission, they both had overdrive fluctuations (going back and forth, an actual hesitation) when climbing moderate inclines, but once I manually shifted the transmission down to the 3rd. gear the car ran fine, but if put back into the top 4rth. gear then the hesitation would occur irratically, but occur definitely when climbing any incline (this is probably common, but I would hope that there is a simple solution, probably some kind of sensor), any ideas how to fix it people?



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Solution: most likely it will be a stopped up Catalytic Converter, this robs the engine of power and will eventually shut it down (overheating it as well), and the tell tale sign of this is balking or hesitation on the highway when the vehicle is in top gear overdrive running at its lowest r.p.m. and when trying to acceerate quickly (like attempting to execute a pass).

Posted on Apr 22, 2009

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This is normal for the transmisson to down shift out of over drive it does this because your engine is running out of power on the up grade. now you shouldnt be alarmed unless it slips out of overdrive on a flat road

Posted on Apr 21, 2009


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