Question about 2006 Buick Rainier

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Constant sudden lurch while driving, like a transmission slip

The vehicle, which is an automatic, makes a low "thud" sound while in the lower gears with a slight lurch. Once it shifts into higher gears, it seems to disappear. If I increase acceleration, there are no lurches, but while slowly accelerating, and the engine is warm, there is a sort of "thud... thud... thud..." timed evenly apart, each with a lurch. It's not as bad as it used to be, but it still occurs from time to time enough to be an annoyance.

The dealership service center claims the vehicle's computer is learning our driving habits and trying to adjust its shift points accordingly. The vehicle does have a sophisticated "driver 1, driver 2" setting, but if this is the case, shouldn't there be an option to override this "learning" feature and assign a default shift pattern?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Ajkill
  • 2035 Answers

SOURCE: (lurching, surging, gasping, hesitating, shuttering)

This could the problem with on board computer please get it checked..............

Posted on Jun 19, 2008

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dgjtex
  • 405 Answers

SOURCE: transmission on 1995 Buick Century, slipping badly

Sir I would first change my filter. When you do you should be able to acertain if anything is wrong by what yuo find in your pan. I think your clutchs are probably bad, but with out being able to scan it I don't have any other ideas. I have been lucky a couple of time before and changing the filter solved my problem. Your car is in limp mode generally you have reverse and second gear. 1st gear and reverse use the same clutches, so I am wondering if maybe you have second gear only!

Posted on Dec 26, 2008

  • 58 Answers

SOURCE: 2001 buick regal gs 3.8L

Sounds like a plugged catylic convertor. You might check with a GM dealer to make sure if it falls in the Special Policy coverage to get it replaced under warrenty, it has to have less than 120,000 miles on it though.

Posted on Jan 04, 2009

  • 98 Answers

SOURCE: When accelerating from a stop, car lurches when shifting gears

On a lot of vehicles there is a transmission speed sensor that receives data that tells it how fast the car is going and shifts accordingly. If this sensor is bad the transmission can't function properly. I would have this checked, they are not that terribly expensive, and not that hard to change on most vehicles. Hope this helps.

Posted on Mar 02, 2009

billshoff
  • 23 Answers

SOURCE: car lurches and bucks, rpms erratic on acceleration on hills

You could have any of these problems:
1) vacuum leak- broken air hose or disconnected air hose.
2) water in the gasoline- add a water remover to you gas tank.
3) bad or disconnected spark plug wire(s).
If this were my Forester, I'd take it to a mechanic who has a electronic engine tester..

Posted on May 07, 2009

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