Loss of fluctuation of rpm while the car is cold or warm

Hi and thanks for using 2CarPros.com.

The first suspect I have is the idle air control valve (IAC). The IAC is responsible for maintaining the engine idle speed. Here are general directions for replacement. What I would like you to do is remove it and inspect it for carbon, function (have a helper turn the key on and off while you check for movement,) and if the air way is blocked with debris.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

I attached a picture of the IAC location. It is component I-1.

Check this and let me know what you find.

Take care,
Joe

Thank you so much.

I was also suspecting that but few days ago a mechanic opened and cleaned the throttle body, spark plugs and also the radiator. Is it not the fault of cool temperature sensor which is always sensing as warm even if cold? Waiting for much helping advice. thanks

Did he clean the IAC which is different than the throttle bore? On these cars the IAC gets stuck causing the engine to stay at one idle, but the engine coolant temperature sensor can cause this as well. Here is a guide to help walk you through the steps and the location for the sensor for your car below:

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement


Check out the diagrams (below). Please let us know what happens.

Cheers, Ken