Question about 1999 Buick Century

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The air intake on my 1999 Buick Century is not working properly. The car will not idle and it keeps rocking like it wants to surge. couldI be missing a seal?

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You may have a bad plenum and are getting blow back.While the engine is running remove the oil filler cap and see if it changes the way the vehicle is running. The Buick they used a plastic plenum and it was a bad design for GM they are famous for problems.

Posted on Oct 19, 2010

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1 Answer

1999 BUICK CENTURY 3.1. CHANGED INTAKE AND GASKETS. NOT IDLING RIGHT


recheck the gaskets possible vacuum leak --others are plugs not gapped right-plug wires not on correctly or damaged/worn popped or damaged vacuum line --sensors to throttle body not connected or damaged ---throttle body needs relearn ---

Jul 07, 2016 | 1999 Buick Century

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What are the symptoms of a bad intake gasket on a 1999 buick century?


Coolant leaks,When the intake manifold gasket cracks or blows out, coolant will leak out of the intake manifold. You may see puddles underneath your car or notice smoke or steam coming off of the engine and exhaust from the coolant dripping onto it and then burning.Overheating, If the intake manifold gasket fails and allows coolant to leak out into the engine, your car will begin to overheat. If your car frequently runs low on coolant or begins to overheat, check the intake manifold gasket.Running poorly, When the intake manifold gasket falters, it affects the way the motor handles its emission gases. The change in pressure can affect the vacuum in the intake as well as how smoothly your car runs. Mainly, it will idle roughly and may hesitate, cough or sputter.

Oct 27, 2013 | 1999 Buick Century

1 Answer

What is a vaccum leak on a 1999 buick regal


All engines have vacuum created in the intake manifold, because the pistons are pulling in air into the cylinders from the intake manifold, resulting in a pressure drop in the intake. A leak is caused when the intake manifold gasket is bad, or when a vacuum hose off the intake becomes disconnected or breaks. The hose will then **** extra air into the intake, causing a higher than normal idle, maybe a rough running condition, and can be identified by a slight whistling noise at the break or at the disconnected end of the vacuum hose.

Feb 20, 2012 | 1999 Buick Century

1 Answer

My car wont stay running unless i keep my foot down on the gas pedal its a 1992 buick century station wagon


Most likely idle air control valve full of carbon and junk,it's kinda hard to get at to clean but if you take the air intake off and remove the silly screen in the intake manifold(gm said is was to correct
a driveability issue) Spray intake cleaner in the air horn ,engine off,try to clean off the throttle plate,you can see it ,get the back also,an old toothbrush helps if it's really bad.Open the throttle to get at the back.
Hopefully the excess runoff will take some of the same junk off of the IAC(idle air control)
It will start hard after this ,but it WILL help.

Jul 31, 2011 | Buick Century Cars & Trucks

3 Answers

1999 buick century coolant on top of intake manifold no engine lights on


Carefully check all hoses & clamps. If leak/seepage not found then check for leak along the intake manifold - the manifold gasket could be leaking and this is quite common.

Jul 05, 2010 | 1999 Buick Century

1 Answer

1989 buick century custom problems


sounds like a dirty idle speed control valve.

To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

May 19, 2010 | 1989 Buick Century

1 Answer

I replaced the air filter in my 1999 Buick Century. I can't remember how the old one went in. I placed the wired side of the filter toward the engine, is that correct?


The wired side faces the air intake, not the engine. other wise, if the wire were to some how break or corrode, the debris will not enter the engine. Thanks for using Fixya.

Apr 09, 2010 | 1999 Buick Century

2 Answers

Car dying when letting off gas


Sounds like it's your IAC (idel air control sensor).  The IAC is a computer-controlled air bypass valve located in the throttle body. It helps control idle speeds by allowing air to bypass the throttle plates as to increase the idle speed.  If the IAC isn't working properly the car will stall when you are not pressing the gas pedal.  It is located on your throttle body and is relatively cheap and a simple change since it is normally held in my two screws.  Let me know if you have any other questions.  Thanks for an honest ranking and for using FixYa!

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1 Answer

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take the hose off the intake at the throttle boby and spray it with some type of intake cleaner spray wile car is running keep car running this will make it better

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