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Q: My car turns off when at idle or in a traffic light

asked by on

I have change the throttle body gasket cover and still the same thing

A: This is a common sign of a dirty or failing...

This is a common sign 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. his valve is controlled by the vehicle's computer which 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. This is all controlled by the idle air control valve. When the engine RPM drops below the normal range of 750-800 RPM (for most cars), this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. To avoid any unnecessary repairs, I would recommend having an expert from YourMechanic come to your location to diagnose your stalling condition and repair your idle air control valve as necessary.

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