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Why does the scooter have unstable idle speed and always stall?

1 Answers

LukeMarie

09/07/25 2:57am

The reasons for unstable idle speed and frequent stalling of the scooter are as follows: 1. Idle speed switch: When the idle contact is closed and a low potential is input to the IDL terminal of the ECU, the ECU determines that the engine is in idle condition and starts the idle control program to control the engine operation. Due to improper adjustment of the idle contact gap, poor contact, damage, or circuit failure, the motorcycle engine ECU cannot correctly determine the idle condition, leading to idle control errors and various idle speed problems. 2. Idle speed control valve: The idle speed control valve is used to control the bypass air volume entering the intake manifold bypassing the throttle valve during idle conditions to regulate the idle speed. The engine maintains stable operation at the set target speed based on signals from the water temperature sensor and other auxiliary device status signals, using a feedback control process. The ISC control valve types include stepper motor type, rotary solenoid valve type, duty cycle control type, and vacuum solenoid valve type. When the ISC valve is clogged with carbon deposits, stuck, or when the control circuit experiences short circuits, open circuits, or grounding, the engine ECU cannot correctly control the opening of the ISC valve, resulting in poor idle speed.

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