What is the reason for the BYD F3 stalling when the accelerator is released?

[Amir]

The reason for the BYD F3 stalling when the accelerator is released is an issue with the idle speed motor. The idle speed motor is primarily responsible for maintaining the car's idle speed. Its purpose is to adjust the idle speed based on the engine load during idling. The idle stepper motor is mounted on the throttle body and is controlled by the engine control unit to regulate the engine's idle speed. When the engine speed deviates from the idle speed, it is adjusted by the throttle valve, which controls the amount of air entering the intake manifold and is mechanically operated by the accelerator pedal cable. The pivot of the automatic idle speed motor extends into the bypass air passage, regulating the air flow through it. The engine control unit uses input signals from various sensors to move the pivot of the automatic idle speed motor in and out of the bypass air passage to adjust the engine's idle speed. When the ignition key is turned to the on position, the automatic idle speed motor begins operation.