Q: Idle issue

asked by on December 07, 2016

Idle sits low flickers on instrament panel radio turns off this is only when i am not in motion

My car has 115000 miles.
My car has an automatic transmission.

The low idle may be contributing to the flickering of the lights in the dash due to low charging output by the alternator as a result of the low engine idle. The low idle may be a result of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. Since this valve is controlled by the vehicle’s computer, it will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve making the transition from a higher RPM back down to idle speed. When the engine RPM drops below the normal range of about ~800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your idle air control valve.

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