Question about 1999 Buick LeSabre

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99 buick lesabre started running rough know check engine light came on the car has 86,000 orginal miles. what can i check.

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Take it have theme read the codes maybe a vaccum leak,mass air flow sensor,egr valve could be numerous things the code will tell you

Posted on Jun 20, 2009

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Posted on Jan 02, 2017

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99 Buick Lesabre Check engine light flashing.I changed wires and plugs but still misfiring on one cylinder, but all plugs are firing. Have 84,000 miles and has been running great until light came on and...


From the symptoms of the problem and the precautions you have done i think its time to check the EGR valve.Clean your EGR valve and then put it again. How handy you are in ding this?

As the check engine light is on did you scan for error code which will help you more specific to locate the problem.

Sep 23, 2011 | 1999 Buick LeSabre

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Hi: re a 2000 lesabre w 86,000 have an auto tranny shifting problem. It's not too bad, but noticing knocks/hard shifts when slowly accelerating from a stop (underload up a grade mostly). Can also be at the...


Sounds like the vacuum modulator on the side of the transmission or the vacuum hose going to the unit. I'm not sure if buick Is fed off of the carburetor vacuum or there's a vacuum tree on the rear of the engine block that may feed it as well. Typically if there is a vacuum leak to the modulator, your engine power will be decreased and your engine will be running rough.

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have the coils and control module tested, sounds like you lost a coil so it not firing on all cylinders, it puting gas into nexhaust thats the smell, have it checked asap so you dont damage converter, hope this helps.

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Dash lights blink, engine stalls then runs on 1997 Buick LeSabre


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Mar 10, 2017 | 1997 Buick LeSabre

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Rough idle


fuel filters rarley cause idle problems. i would look at the egr valve or possible vaccume leaks.

Aug 24, 2008 | 1999 Buick LeSabre

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