Question about 1999 Buick Century

1 Answer

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.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • 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



6 Suggested Answers


6ya staff

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017



  • 85222 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


  • 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.

Posted on Feb 10, 2009


  • 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


  • 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

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 87 buick centry stalls while driveing but when it stalls the battery light and service engine light comes on but once i put the car in park or nutrol it will start back up

My 1987 buick centry limited cuts off when i drive but when i start it back up it will start right bacc up at times some times it starts and die agin but when it dies the battery light and service engine light comes on but once it starts the service engine and battery light goes away and dont do it agine tell it cuts off agine

May 27, 2012 | 1987 Buick Century

1 Answer

My front end of my 06 dodge stratus shakes during acceleration and calms down when I set the cruise control. It starts about 35mph.

Aside from the usual rotating tires to different
locations & balancing ,in case a wheel weight fell off,
you have to check motor & transaxle mounts & front
CV drive axle joints

Assuming you have no real obvious worn ball joints

These issues exist simply because someone just has
to get under the car & start to really apply their skills
& find the problem

If you don't do your own work, you are just sold any number of
services & no effort is put forth to help with the real shaking
issues etc

Sep 23, 2011 | Dodge Stratus Cars & Trucks

1 Answer

My 1999 Buick Centry makes a squealing noice when accellerated. What could this be?

could be a number of things, I'd go with a loose or worn belt , open the hood and rev up the motor, see if the squeal your hearing happens with the car not moving

Aug 26, 2011 | 1999 Buick Century

2 Answers

When startn car engine cold idels high to low ,up

sounds like the throttle position sensor, I think that is the one that makes it idel rough

Apr 10, 2010 | 1987 Lincoln Town Car

1 Answer

My buick centry is missing real bad.

Make sure you do not have any vacuum leaks and the egr is functioning properly. Next do a compression check and see if you have a low or dead cylinder. I hope this helps you to find your solution. Merry Christmas! and God Bless!

Nov 23, 2008 | 1995 Buick Century

2 Answers

97 buick headlights go out

where is the relay headlight switch located on a 1998 buick century

Oct 31, 2008 | 1998 Buick Century

Not finding what you are looking for?
1999 Buick Century Logo

Related Topics:

401 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

85222 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides