Question about 1999 Buick LeSabre

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Low idle and stall

1999 Buick Lesabre Custom. Car idles pretty low, tries to keep steady and then rev's and drops back to a struggle to not stall out. Able to start the car and drive around town for a few miles. Have been ruling out possibilities. Fuel change, all liquids topped off, and replaced the fuel filter. Any advice? MAS or solenoids you think?

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Check your idle air control valve(IAC) its probably dirty and are not able to move freely
the IAC valve controls the air mixture at idol speeds

Posted on May 17, 2009

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91 buick lesabre chugging at idle and accelerating smooths out at speed


It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

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I suggest you refer the link below and follow its troubleshooting details:------

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http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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These details will help.

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Low idle p0507 pictures of the part


http://www.autozone.com/autozone/parts/Duralast-Idle-Air-Control-Valve/1999-Buick-Lesabre/_/N-jd47xZ9gsof?itemIdentifier=91113_0_0_Idle control system high(rpm).This is what it states for code P0507.Code P0506 is for low(rpm).Buicks have a history for sensors that go bad and hard to find which one without replacing some that are good.Here is a part to check out,Click on link to view.

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1999 Chevrolet Geo Metro. I gave my sister a boost one day and they dropped the cables and they touched and surged my car causing it to stall and every since then my rev keeps going high then low high then...


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