Abnormal noise was made in the throttle of Chang 'an minivan during cold start. What happened?

Hello, according to your fault description, your idle control valve should be broken. Idle speed control valve is used to control the intake air added to the engine when the engine is idling, and it is mostly used to pull the throttle. The working principle is: when the idle speed is lower than the set speed value, the engine computer instructs the idle speed control valve to increase the throttle opening, thereby increasing the air intake and improving the idle speed of the engine. When the idle speed is higher than the set speed, the computer will instruct the idle speed control valve to reduce the throttle opening to minimize the intake air and reduce the engine speed. When your car is cold-started, the throttle makes abnormal noise, probably because the idle speed control valve is stuck and doesn't work well, and the throttle carbon deposit is too dirty. Solution: Clean or replace the idle speed control valve and initialize it. I hope the above answers can help you. If you have any questions about cars, please ask me! Welcome attention!