Question about 2000 Buick LeSabre

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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.

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  • 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



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

Posted on Aug 07, 2008


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