The idle air control (IAC) valve or actuator controls the idle speed of fuel injected vehicles It takes control of engine rotational speed only when your foot is off the accelerator It is controlled by the computer and idle speed is determined by engine temperature If you notice your vehicle idling roughly or stalling, it could point to aJan 07, 19 · In any car, an i dle air control valve or more commonly known as an idle air control actuator is a small device that controls the idling rotational speed of the engine The idling rotation speed of the engine is how fast the engine run when the car stay still It has the unit as revolutions per minute/revs per minute/RPMInstead of using a stepper motor based Idle Air Control valve, your MegaSquirtII™ controller can be configured for a 'Fast Idle Valve' The fast idle valve is an open/close solenoid vacuum control valve to admit more air to the intake manifold when cold Unlike a cold start injector, it does not handle fuel at all, only additional air
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