Idle air control valve overview
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The idle air control valve http://www.partsamerica.com/product_images//img/nie/21757.jpg (IAC) is a stepper motor http://en.wikipedia.org/wiki/Stepper_motor http://upload.wikimedia.org/wikipedia/en/thumb/f/f8/Stepper_motor_1.png/241px-Stepper_motor_1.png which regulates the amount of air entering the engine during idle and other times during an engine's run period (such as deceleration). There are actually two idle settings on most fuel injection engines: minimum idle and running idle. Minumum idle is the idle based on the throttle blades alone with the IAC passage closed. Running (or commanded) idle is programmed in the chip. | The idle air control valve http://www.partsamerica.com/product_images//img/nie/21757.jpg (IAC) is a stepper motor http://en.wikipedia.org/wiki/Stepper_motor http://upload.wikimedia.org/wikipedia/en/thumb/f/f8/Stepper_motor_1.png/241px-Stepper_motor_1.png which regulates the amount of air entering the engine during idle and other times during an engine's run period (such as deceleration). There are actually two idle settings on most fuel injection engines: minimum idle and running idle. Minumum idle is the idle based on the throttle blades alone with the IAC passage closed. Running (or commanded) idle is programmed in the chip. | ||
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The IAC also has a "Keep Alive" function. If it detects a drop in RPM, it will open to help "keep alive" the engine. This is why you want your warm idle setting to be at or below its half open range. For instance, if at idle the IAC was at 140 steps (almost fully open) it wouldn't have much room to open up to keep the engine running. | The IAC also has a "Keep Alive" function. If it detects a drop in RPM, it will open to help "keep alive" the engine. This is why you want your warm idle setting to be at or below its half open range. For instance, if at idle the IAC was at 140 steps (almost fully open) it wouldn't have much room to open up to keep the engine running. | ||
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