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Car is idleing high and will not idle normal - 1989 Lincoln Continental

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Either you have a vacuum leak or a faulty Idle Air Control Valve (IAC) First check all vacuum hoses

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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My van is idle high i cleaned the throttle boady and it idle down the a few hours later its high idle again why i replaced two sensor and still idle high


Hi Alexandra, Im AL the owner of Big As Auto Repair

There are several things that can cause high idle, but the 2 most common problems are as follows.

(1) You could have a vacuum leak somewhere on the engine. Here is how to check for that issue. Here's what I want you to do: Buy a can of CARB Cleaner and while the engine is running spray around the Intake Manifold, the manifold is the thing the throttle body sit on. Also spray around all the vacuum line as well. If while spraying there is a change in the idle speed then you have found your leak. If there is no change then move on to step 2.

(2) Sometimes when you have a high mileage vehicle parts begin to ware out or can also begin to stick in place. Here something you can check. Idle Air Control Motors can start sticking from corrosion build up and can cause a high idle issue. Here what I want you to do. Start the engine and let it idle, while its idling I want you to tap on the Idle Air Control Motor If it idles down to normal idle speed replace the motor. The motor mounts onto the throttle body and most of them are round. Once you replace it and start the engine you'll notice that its idling real high, :This Is Normal, just let it idle until the engine controller resets the idle speed to normal.

Hope this helps and should you need further help please visit my auto repair website. http://www.bigasautorepair.com/

May 25, 2015 | Cars & Trucks

1 Answer

What is the problem if carburetor idles high even when valves (mixture, idle) are at low adjustment?


are you allowing the car to warm up first before checking your adjustment screws? have you also checked the timing of your vehicle?

Jul 28, 2014 | 1990 Toyota Corolla

1 Answer

Idles high when cold 2004 jetta 1.8 t


This is normal. The ECM monitors engine temperature and increases idle when it sees the engine is cold. The ECM sets the idle back to normal when engine temperature rises.

Jul 13, 2014 | 2004 Volkswagen Jetta

1 Answer

High idle


Time for a IAC (idle air control ) motor
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Jan 22, 2013 | 1991 GMC Sonoma

1 Answer

2010 Mazda 3 idling high when i first start it


Its normal .. its the automatic choke,,, no problem,,, the high idle should last longer in the winter.. when it "cold" in Florida.. hehehe...

Aug 07, 2017 | 2010 Mazda 3 2.0

1 Answer

High idle( 1000-1200mpr)


the most probable cause for high idle is the idle air control because this sets idle on todays cars. you could have a vacuum leak, but remove and clean IAC first. to see if it goes to the proper rpms. good-luck !

Dec 25, 2011 | Cars & Trucks

1 Answer

89 dodge shadow. hard start. normal idle cold, fast idle warm. sometimes it wont start until i hear fuel pump activate.


Hello,
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day. -Steve

Dec 06, 2009 | 1989 Dodge Shadow

2 Answers

Idles too high


This is fairly normal on most cars. It is like the choke. When choked, the idle raises up to increase the internal temperature quicker. Also helps free friction of parts due to the cold. Idle is adjusted by the cars computer and o2 sensors.

Jul 10, 2009 | 1998 Mazda MPV

1 Answer

2004 crvautomatic high idle on cold startup 1600rpm takes 3 to 5


Hondas are famous for this, my accord does it. This is normal UNLESS it still idles high after normal running temp. has occured. Watch your temp. gauge when it reaches normal temp tap the gas a little bit if the idle drops then it is fine

Dec 01, 2008 | 2004 Honda CR-V

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