Why does the car jerk when hot but not when cold?

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Cold car does not jerk but hot car jerks because the solenoid valve is damaged and needs to be repaired at a professional repair shop in time. The following is a related introduction about the solenoid valve: Introduction: The solenoid valve (Electromagnetic-valve) is an industrial equipment controlled by electromagnetics, which is an automated basic component used to control fluids and belongs to the actuator, not limited to hydraulics and pneumatics. It is used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. The solenoid valve can cooperate with different circuits to achieve the expected control, and the control accuracy and flexibility can be guaranteed. There are many types of solenoid valves, and different solenoid valves play a role in different positions of the control system. The most commonly used are check valves, safety valves, directional control valves, speed regulating valves, etc. Working principle: There is a sealed cavity in the solenoid valve, with through holes opened in different positions. Each hole is connected to a different oil pipe. The middle of the cavity is a piston, and both sides are two electromagnets. The valve body will be attracted to the side where the magnetic coil is energized. By controlling the movement of the valve body, different oil discharge holes are opened or closed, while the oil inlet hole is always open. The hydraulic oil will enter different oil discharge pipes, and then the pressure of the oil pushes the piston of the oil cylinder. The piston drives the piston rod, and the piston rod drives the mechanical device. In this way, the mechanical movement is controlled by controlling the current on and off of the electromagnet.