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if you have an older model car your carb my have a thermo coil choke and it will cause the engine to idle high... but won't kill it... unless you are in need of a tune up....
it could also be a problem with the way your float is adjusted and it will cause the carb to pour gas into the engine making it rev up then flood it out witch would kill it...
now on any fuel injected cars it could just be a simple miss fire.. if your car was made after 1995 it is possible that your check engne light will be on and tell you exactly where the problem is. most likely it's a miss fire
What else can I help you with?
Would an idle air control valve cause a car to idle high?
Yes if it is stuck open.
Can a bad battery cause a car to idle high?
No, that has nothing to do with idle speed.
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?
What can cause the car to stall when running the ac?
An engine usually has a higher idle speed when the ac is running. If the high speed idle does not operate then the ac will cause the engine to stall.
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.
Why would a car idle too high?
A vacuume leak at the intake manifold or vacumme hose can cause a high idle. On carbuerated vehicles the idle adjustment screw may be set to high. On fuel injected vehicles, the Idle Air Control(IAC) circuit or valve may be faulty. On newer vehicles you may be able to get a trouble code to help pinpoint the problem. Chris
Would a busted throttle cable cause a car to not run?
It would start and run but only idle. It would not be drivable.
Why would a car idle high when at a stop?
because the throttle linkage is suck or the carburetor is faulty
Will a clogged air filter cause a car to idle poorly?
Absolutely - a clogged air filter can cause a car to idle poorly. You could also get poor gas economy and high emissions. Also, if the computer were not able to compensate for the high fuel mixture, you could set a code and/or destroy your catalytic converter.
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
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 !
On a 1991 Nissan maxima Idle is good at starting car then the idle goes up high for a while then is up and down?
A faulty camshaft can cause your 1991 Nissan Maxima to idle erratically. A diagnostic test could verify the cause of the improper idling speed.
