Question about Buick Regal

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1991 Buick Regal, auto trans, 3.8L engine, problem; upon starting it would idle at higher than normal rpm and would not drop back down even when warmed up.

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  • Anonymous Mar 24, 2014

    idle go's up and down after it warms up

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The problem may be a buildup of carbon or fuel varnish deposits in the idle speed control valve (also called the idle air control valve or IAC valve). The cure for this condition is to clean the valve with some aerosol throttle cleaner or engine top cleaner. disconnect the air ductwork from the throttle body. Start the car and run at about 1500 rpms spray the cleaner directly into the throat of the throttle body. Turn off the engine and let sit for a few minutes. Then repeat the process a cpouple of times. if that does not work, you can remove the IAC and clen it by spraying into the two holes on the underside of the valve.If not, then you need to replace the valve.

Posted on Nov 08, 2008

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The engine of my 2010 buick regal gs 3.8l super charged engine shutsoff while im driving..primarillary when i slow down t make a turn or stop 4 a red liught luckilly it5 restarts but its scary


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My 1991 Buick Regal (3.1 engine) use to start a high RPMs and then slowly, as the engine warms up, the RPMs would come down to about 800, which is the normal. However a few weeks ago, it started to start...


Hi,
You need to get your engine coolant thermistor checked and tested. This is what tells the ECM when the engine temperature is at normal working temperature and turns the idle down.
But when the idle won't come down from cold to warm this is usually the main fault.
Hope this helps.
Thanks
Jason

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When i start up my 96 buick regal it idle's real rough between 500 to 1500 rpm's and will spike up to 3000 rpm then drop so low it dies. Whendriving there is no problems just when idleing. I have replaced...


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I have a 1991 buick regal stalls and shut off after warming up


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