Question about 1999 Hyundai Sonata

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After engine is warm idles up and down at high idle dead spot in throttle also cuts out wont start again until cool down

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Posted on Jan 02, 2017

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jryan11kc343
  • 19 Answers

SOURCE: Engine idling high in park. Will not start until

check your IDLER

Posted on Jul 11, 2009

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ghost45
  • 1280 Answers

SOURCE: when engine starts, idle races aat varying speeds.

Insufficient information

Posted on Nov 04, 2009

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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

After starting my 98 metro 1 liter the idle increases in less than a few minutes until the engine is racing so fast I have to shut it down, help?


Generally speaking, the only way for the idle speed to increase is if extra air is getting past the throttle plate.
So that could include the throttle plate sticking open, the idle air control valve not closing, or a vac leak somewhere such as a hose or gasket.
If you can cover the throttle body with something and the engine still runs at a high speed there is a large vac leak somewhere.

Jan 22, 2013 | Cars & Trucks

1 Answer

2002 Jeep Liberty - 3.7 Liter - Engine has begun to die when rpm is at or near idle. Such as pulling into a parking place or stopped at traffic light. More frequent after engine has warmed. Once engine...


I would start with cleaning the throttle bore and plate. Then clean the Idle Air Control valve, IAC, as this is the device that controls idle speed. Use a can of spray carb cleaner and an old toothbrush. Trouble with the IAC would make sense if you can keep the engine going by holding down the gas pedal a bit.
Use the carb cleaner to check for vacuum leaks at hose connections and elbows. run engine and spray short bursts at hoses and listen for idle speed changes.
And lastly if problem is still there check MAP sensor.

Jan 27, 2011 | 2002 Jeep Liberty

1 Answer

A 1985 Sentra - The engine idles until warm then it dies.


has it got a idle control valve, have tried adusting throttle cable slightly

Oct 05, 2009 | 1985 Nissan Sentra 2 Door

1 Answer

1990 full size blazer starts fine idles then dies


sounds real easy either a bad idle air control solenoid or more likley a blown throttle body gasket. to test fro a blown gasket, with engine running and cool spray carb cleaner or brake cleaner around base of tb were it bolts to intake. when it hits the bad area, should idle down and be normal for a second or 2. iac is possible,try this first since its so common and let me know

Aug 26, 2009 | 1990 Chevrolet S-10 Blazer

1 Answer

Idle out of control.


check all your vacuum hoses and the throttle body itself for a vacuum leaks if the hoses replace as nessasary if to check for throttle body get can of carb cleaner and spray around base of throttle body and sides not in it if idle raises you have a vacuum leak goto a good parts store and ask for a rebuild kit don't goto auto zone or advance they don't carry them

Apr 22, 2009 | Chevrolet Sportvan Cars & Trucks

1 Answer

02 Grand Cherokee High RPM start. Cuts out when driving


Ckean throttle plate inside throttle body...They tend to get dirtier than their counterparts in carbureted engines due to lack of fuel spray that kept them clean. If no luck with that, clean idle air control valve on TB. When doing this, don't turn the plunger, just clean with carb spray and replace. do not loose "o" ring seal.
Good luck

Mar 20, 2009 | 2002 Jeep Grand Cherokee

2 Answers

Idling problem


check all the vacuum lines to make sure they have no holes or damage or have come off especially the one behind the throttle body

Feb 21, 2009 | Mitsubishi Colt Cars & Trucks

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