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It's usually a vacuum leak.

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โˆ™ 2006-04-12 03:06:37
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Q: Why does your car idle very high?
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High idle problem on a 1997 Saturn SC1 when car is in gear?

high idle problem on a 1997 sc1 when car is in gear


1968 car idle very high when started in park?

Your car will idle high until the engine begins to warm. You could set the idle to be a bit lower, but that may cause the engine to stall out when it's cold out. The engine should begin to lower the RPMs when it is warmed up.


Can a bad battery cause a car to idle high?

No, that has nothing to do with idle speed.


Would an idle air control valve cause a car to idle high?

Yes if it is stuck open.


When starting car engine idle is very low?

Since it is starting from 0, the engine idle is low.


Your car rpm are high even in park?

Adjust your idle.


Where is the fast idle screw on a 2001 ford escort or how do you adjust the fast idle?

It is very likely there is no way to adjust the idle on your car. If your car is idling low, it's probably a problem somewhere else. Idle is likely controlled by the computer.


What happenes if the Idle speed in a car is too high?

the engine runs at a faster rate than when the idle speed is lower.


I have a 1992 cadillac seville. when i start the car it idle high and will not come down?

First you must check the ISC motor ( idle speed control) operation. Its located by the throttle body. It controls idle and high idle speeds. Good luck


What would cause the engine to idle very high and then it stalls out but if you give it some gas you can keep it running but again at a high idle?

Check the alternator.


In which city car production is very high?

in japan car production is very high


What causes your 1991 Plymouth Acclaim to idle rough and lose power?

Could be the TPS, it will cause it to idle high and low and make the car become sluggish, but a vehicle will run without one, but it will run very rough.


Why does my 2001 kia Rio vibrate when i am stopped at a light for example the car shakes through the steering wheel it's coming from the engine the vibration stops when i put it in neutral?

It is the Throttle Position Sensor. I also have a 2001 Kia Rio and my car has been doing this since last year. Brought it to mechanics in the city and no one could figure it out. A backyard mechanic figured it out for meMy car will idle high upon startup and then stall. It once took me 7 startups before I finally got it going. Also, it will begin to stall once you hit the accelorator just after startup. The idle is so high in my engine that the vibrations are annoying on the arms when car is stopped at lights, etc. It's very embarrassing when other passengers are in car. Neutral makes high idle go away. High idle will also "break" into normal idle occaisonally then go back into high idle when car is stopped. Car will also violently jerk upon hitting accelorator for merging purposes.


What is causing the high idle sound when you start your car?

Cars often idle fast when you start them up. The automatic choke will make the car idles fast for a while then the idle speed will slow down, once the engine warms up.


What would cause my car to idle around 2500 rpm in 2006 Chevy cobalt I put in a new throttle body and took to dealership to relearn idle but idle is still high?

A vacuum leak could do that. Did it have a high idle before you changed the throttle body? Any codes?


How will a car run with a defective iac motor?

Poorly, it may idle to high or not at all.


1986 Honda accord Gas in the oil system?

If you have gas in your oil, then the probablity is very high that your head gasket is blown. I bet your car is running very rough, difficult to maintain idle, and acceleration is poor.


Does the car run rough even in gear and moving if the idle air control valve is bad it runs smooth at high rpm?

Once your out of idle the idle air control valve isn't used so it shouldn't affect the operation of the car once your moving


Why would a car idle high when at a stop?

because the throttle linkage is suck or the carburetor is faulty


What is the idle RPM for a 1.8L integra?

when u first start the car it will idle high, around 1.5 rpm to 2 rpm. when its warm up it should idle between 700-1000 rpm


WHY DOES THE 1991 Mercedes Benz 500sl HAVE high idle?

How high is your idle? idle should be 800rpm good oil pressure is obtained at this idle


How do you turn on the cold weather high idle setting on a 2002 Chevy duramax?

to turn on the high idle you must run a wire to the ecm /www.kennedydiesel.com:.webloc if you go to this link it will give you the instructions to do it. I did it on my truck and it works great !!! if you have a car starter with an available output you can connect it through that and run you high idle from that.


When you put your car in gear it makes a thumping noise?

if the vehicle shifts and drives fine. the most probable cause for this is a high idle. most vehicles idle at around 650 to 700 rpms. when warmed up, check or clean the idle air control if idle is high. good-day !


High idle at start up car wont turn off?

need more info but just guessing here vacuum leak causing high idle and dieseling cause by high fuel air mix why it will not shut off


What causes low idle?

could be alot of things from a vacuum leak to a IAC (idle air control) module the type of car is very helpful