Question about 2008 Buick Lucerne

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Maintaining a consistant speed

Example: I will speed up to 60 MPH and level off at that speed. I hold my foot very steady on the gas pedal. Within a minute the car will start to loose speed by 8 - 12 MPH.
As I react to regain the speed, I press the gas pedal and stop immediately upon feeling the car start to gain speed. Again, I hold my foot very steady. I would expect to increase speed by 2 - 4 MPH; instead, the car increases speed by 8 - 12 MPH.
The above speed decrease and increase is a steady increase. A steady speed cannot be maintained.
Using the speed control eliminates the above problem.
The dealer has looked at 3 times: 1 st time - couldn't ID problem; 2nd time I had a mechanic dive with me, he experienced the problem - car not fixed; 3rd time, dealer said they worked with GM and fixed === IT WAS NOT FIXED.
Any suggestions? From: MEJ in Ohio

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I had the same problem with my Century. It's a very uncomfortable feeling when the car constantly trys to get away from you. I understand my mechanic replaced the throddle body with a another one (probably used) a year ago. This fixed the problem. Now after a year it's acting up again. What makes this really frustrating is that this just started again after after a $500 brake job which will cost me even more to get the ABS light to stay off. Public transportation is the solution!!!

Posted on Sep 09, 2012

  • James Kershaw
    James Kershaw Dec 06, 2014

    With my solution of public transportation for my Buick problem life has never been better. The Buick gave it's last gasp by refusing to start which was diagnosed as a wiring issue which would have cost me 500+++ Signed over the car to my daughter who she she would assume the costs. Last I heard it's still sitting in the garage. But my life is wonderful -no bills, repairs, insurance gas or headaches. I pay my friend to drive me to my engagements or take a bus. What could be easier? I won't have to be responsible for the poisoning of the future generations who most likely will have to wear air purifiers 24/7

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I would check the throttle position sensor

Posted on Aug 07, 2008

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