Question about 1999 Buick Century

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How to stop a 1999 buick century from ideling high

My 1999 buick centry, when you start it up it start's low then it idel real high,if i put it in drive then it calm down, i can drive it and it drive good, but if you take your foot off the breaks the car will pull forwards. then when i stop to park, and switch gares to park it ideling way high again. can you please help? thank you.

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  • Buick Master
  • 2,431 Answers

You have a failed IAC (Idle air control valve) its on the throttle body,how to stop a 1999 buick century from ideling high - 11_24_2012_4_07_52_am.jpg

Posted on Nov 24, 2012

  • richard Nov 24, 2012

    Thank you Reynaldo, but i changwd the iac, and i also changed the tps sensor. but it still idle high.

  • Reynaldo Andico
    Reynaldo Andico Nov 25, 2012

    There is a vacuum leak,at idle when the engine warm and at operating temperature put your hand on the EGR (exhaust gas recirculation) if it is hot to touch the leak is at the EGR, check also the PCV hose see if the hose is ruptured takiung in false air,somehow there is a vacuum leak its the only thing other than a binding accelerating cable that can cause this

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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emissionwiz

Marvin

  • 85216 Answers

SOURCE: 2002 Buick Century starts good idels good But no

sounds lik either a fuel filter plugged or the cat is plugged, check fuel pressure or just replace filter and if that isn't it have a muffler shop check the exhaust for excessive back pressure.

Posted on Dec 11, 2009

Anonymous

  • 2 Answers

SOURCE: 95 Buick Skylark Stops Running

the fuel pump is slowly going out

Posted on Feb 01, 2009

GM Elec

Bruce Bracey

  • 1000 Answers

SOURCE: high/low sensor switch location for 1999 Buick Century

Ros.....The heater motor is located under the dash on the right hand side (passanger side). You will have to remove the close out panel to access. The resistor you are looking for will be to the lower left of the fan motor at about the 7:00 position. Illustration is below.
let me know.
regards,
0900c15280217dd1.gif

Posted on Feb 10, 2009

Anonymous

  • 226 Answers

SOURCE: 1994 buick lesabre

It could easily be running out of fuel - the fuel filter. And possibly the fuel pump. I would check the fuel filter first. hope this helps you, Rick

Posted on Apr 18, 2009

Anonymous

  • 8 Answers

SOURCE: my car is jerking while accelerating and reaching certain RPM

clean mass air flow sensor check for mil light

Posted on Jun 01, 2009

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