Question about 2000 Buick LeSabre

1 Answer

Buick LeSabre 2000 has hesitation uphills

My Buick drives fine on staightaways and downhills. When I start to go up a hill, the car feels like it is missing and no longer goes uphill smoothly. I first discovered the problem while driving in cruise control. I can get the car to go uphill by continiuing to step on the gas. As soon as I reach the top of the hill everything appears to be OK again.

Posted by on

  • 2 more comments 
  • barbrah Jul 09, 2008

    Hi David,

    The fuel injector has been cleaned and my car seems to be running a lot better. However, the uphill hesitation is still there. My mechanic told me to drive the car around for a while to see if the problem goes away. He put some kind of cleaner in my car which he thinks needs time to get completely distributed. The engine light has never come on but I live in the south and it is hotter than blazes.

    I got more possible answers to the problem. It may be the fuel trim (?) needs to be measured with a scan tool. High fuel trims mean it has a lean condition. Then a fuel pressure gage would be connected to see if the pressure dropped going up hill. Also can be a partially clogged catalytic converter. Hope this helps with your problem.

    My car has 73.524 miles on it and is a 2000 LeSabre. Best of luck to you. Barbra

  • Halliday May 11, 2010


    Was that "73.524" using the European thousands separator (the period, rather than the comma)?  It looks like 73 miles and 524 thousandths, to me.  :-)

    If the "fuel trim" is far off (so the computer thinks the engine is running lean while it's actually running too rich) that can certainly do it.

    I don't yet know what the 2000 Buick LaSabre's behavior is when an Oxygen sensor goes bad (primarily the main one, since I suspect it, like other newer cars, has two---one before and one after the primary catalytic converter).  (My 2000 Buick LaSabre has over 116 thousand miles, so I'll probably find out soon, if the problem I'm having now isn't already it.)

    I have found, from previous vehicles I've owned, that the computer almost never knows when an oxygen sensor has gone bad (only if it is completely out)---it just gets bad information that misleads it into doing the wrong thing!  :-(

    One previous vehicle lit its engine trouble light and reported that the engine was running too lean, even though I could smell that it was running too rich!  Sure enough, the Oxygen sensor wasn't working properly!

    Warning:  I melted a catalytic converter before learning that a car's Oxygen sensor was not working properly!  Having the engine running too rich for too long can cause such problems.

    I wish you good luck.


  • Halliday May 11, 2010


    Does your Service Engine Light ever come on or blink?

    I used to have similar issues on occasion, with no sign of the Service Engine Soon light, except for a few colder mornings when the car would be exceptionally sluggish and the Service Engine Soon light would flash and then stay on steady for a few trips.

    I was told that my throttle body needed cleaning.  Presumably the problem had to do with poor air/fuel mixture and/or poor fuel injector performance.

    Unfortunately, I haven't had the throttle body cleaned or cleaned my injectors, and I have worse problems now (that I hope are not related).

    Good luck.


  • Anonymous Mar 24, 2014

    i dont know if my cas o2 sensor is uphill or downhill


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 9 Answers

It could be the fuel filter. Check fuel pressure and volume.

Posted on Aug 07, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2011 Toyota Camry cruise control does not hold speed at all, when going downhill; is this normal?

Yes, cruse control only controls engine functions, it does not control braking.

Jun 22, 2015 | 2011 Toyota Camry

1 Answer

Van has been loosing power going up hill. Runs fine on level land and going downhill. lately it has been stalling when u first start it up.

try checking your crankshaft or tps throttle position sensor it could cause you to lose power at times

Apr 02, 2014 | 2005 Kia Sedona

1 Answer

Taurus will not start when pointed uphill but will start when pointed down hill

When you pointed uphill the vehicle or downhill how much fuel do you have in the tank? If is low,surely one reason is the fuel capacity in the tank and it is not enough for the fuel pump pick up to reach.

Jan 02, 2013 | 2003 Ford Taurus

1 Answer

Cruise control will not maitain the speed it is set on. going up a hill it gets slower and going down a hill it gets faster

My experience is that cruise control works on level roads, uphill you have to control speed yourself same for downhill. Exception is very powerful cars. Did it maintain speeds before? (uphill + downhill)

Mar 08, 2010 | 1994 Buick Park Avenue

1 Answer

Car feels slugish when going up-hill, slight vibration, level and downhill runs ok, from start shifts through gears fine, just feels odd at times

problems you described would suggest you need to replace the spark plugs, a bad one tends to fail under loads like going up hill. the other thing you could try is to get a better fuel grade, that would correct pinging noises uphill. and throw in some fuel injector cleaner every 2000km, it makes a happy running engine

Nov 03, 2009 | 1991 Oldsmobile Cutlass Ciera

2 Answers

Missing, loss of power, etc.

sounds from afar like a problem i had after installing after market spark plug cables on a diff. car. make sure you have factory-quality/ even mits. brand cables. (right parts vs. after mkt.?- no contest.)

Apr 17, 2009 | 2000 Mitsubishi Montero Sport

1 Answer

Tachometer goes up to 4K when braking for downhill


Dec 18, 2008 | 2008 Toyota Camry

1 Answer

2009 Toyota Camry problems

All Toyota auto trans cars downshift when descending a hill when you tap the brake. This is called "Downhill Shift Logic"; what this is for is to eliminate the double shift when you come to the bottom of a hill and then accelerate. Normal condition. Usually happens above 38 MPH.
Also: The cruise will accelerate when going uphill. Normal condition.Plus: The cruise will not disengage back to the set MPH after you top the hill. Toyota recommends to disengage the cruise when encountering steep terrain.

Sep 09, 2008 | 2008 Toyota Camry

Not finding what you are looking for?
2000 Buick LeSabre Logo

1,122 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

70387 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22041 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6878 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides