SOURCE: Idle surges when it warms up.
sounds like an engine management fault it will need to go on a computer
SOURCE: High idle speed when the engine is cold
The high idle speed at start up is normal. As the engine temperature increases, the engine idle should kick down automatically. Insofar as the emissions results, if there were a problem, the check engine light should be on. If it is, take the car to an autoparts store and have the fault codes read. Most parts stores will perform the scan for free. If the check engine light is not on, and the idle question was all you were worried about, you are good to go! Hope this helped and best wishes.
SOURCE: 4runner idle high when cold after warm up it idle
it seems that the auto choke setting is maybe wrong or there is a problem with engine management, or a worn part which is sticking.
when cold, the engine should be higher as the choke will be on but a warm up idle of 1200 seem a bit high i would expect around 800 and then on restart if the engine is warm then the choke should be off but the idle being too low indicates one of the above.
SOURCE: TOYOTA CELICA 2003 CYLINDER 3 MISFIRING IDLE ROUGH
this a tipical simptom of dirty fuel injectors, make a clean on gaae shop
Engine stalls or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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Is the a/c or defrost on. These have an idle up solenoid when the compressor turns on.
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