Question about 2008 Buick Lucerne
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
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
I would check the throttle position sensor
Posted on Aug 07, 2008
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