What Happens When the Idle Motor Fails?

[MarianaMarie]

Idle motor is a component that controls the idle speed of a motor vehicle. When the engine is running without load, it is called idling. If the idle motor fails, the following symptoms may occur: 1. The idle speed may be too high or too low. 2. A damaged idle motor can cause the engine speed to fluctuate between high and low. 3. Symptoms of stalling at idle may appear. Information about the idle motor is as follows: 1. The idle stepper motor is mounted on the throttle body and is used by the engine controller to regulate the engine idle speed. When the engine speed deviates from idle, the throttle valve adjusts the amount of air entering the intake manifold, which is mechanically operated by the accelerator pedal cable. 2. The throttle body has a bypass air passage that supplies air during engine idle (when the throttle valve is closed). The pivot of the automatic idle motor extends into the bypass air passage, regulating the air flow. Based on input signals from various sensors, the engine controller adjusts the engine idle speed by moving the pivot of the automatic idle motor in and out of the bypass air passage.