Q: My saturn will idle at about 300-450 rpm and then eventually shut off.

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My saturn vue idles extremely low almost to the point of cutting off and sometimes it does just cut off. It only acts up when the car warms up, but when it's cold it acts ok, but still idles low. We've changed the starter, the battery, cleaned the cadalidic converter. The check engine light will start flashing and it feels as if the car loses power and it doesn't matter how much you press the gas the car won't go anywhere when it starts acting funny. We've ran the codes and nothing shows up.

Hi There, It sounds like you may have a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. 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 while adjusting the air/fuel ratio constantly to allow this to happen smoothly. 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 inspect your vehicle.

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