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2000 buick lesabre high idle problem, 800 warm 1300 cold-----how to fix?

This high idle causes transmission jolt when reverse selected.

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The idle speeds software driven But vacuum leaks can raise idle speeds or weak mounts cause the shift in position giving you the jolt.

Posted on Apr 20, 2014

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High idle, 800 warm 1300 cold, how to adjust lower------what are normal numbers?


Those numbers appear to be in the normal range, possibly a bit high? Since adj are all computer controlled, I would suggest removing the air intake hose and inspecting the throttle body bore for "coking" of built up carbon, which is a common cause of idle maladies...

Apr 20, 2014 | 2000 Buick LeSabre

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Mar 01, 2014 | 2000 Buick LeSabre

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My 1998 buick will not change gears at all what could be my problem


Does your car Idle higher than it has been. Vacuum hose going to the modulator may leaking. This would also cause the higher Idle and your transmission not to shift.

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Nov 29, 2009 | 2000 Buick LeSabre

1 Answer

On cold mornings when I start to back out of may car port and shift into reverse the transmission gives a big **** before it gets moving. What am I looking for?


It is very likely that you are not giving the engine enough time to reach it's idle mode. Or the idle mode itself is at fault due to a vacuum leak or a sensor failure. Either way try to listen to the engine when cold, and make sure it has idled down before shifting into gear. Thank you, Dana

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1 Answer

2001 Buick LeSabre auto transmission shifting hard sometimes


See if this helps try changing the transmission fluid and filter also add some Lucas Transmission fix.

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2000 buick lesabre 3800 has warm air blowing out two driver side vents in A/C mode, but the two passenger side vents are blowing cold. any suggestions?


I had same problem on 2000 Lesabre blowing cold on passenger and warm on driver. I fixed it by adding more freon even though it had 28 pounds of preasure. Now it works great!

Jul 30, 2008 | 2001 Buick LeSabre

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