What Causes the Corolla's Low-Speed Jerking?

[LeRosalie]

During low-speed driving, frequent gear shifts between first and second gears cause the clutch to continuously engage and disengage, preventing smooth power transmission in a short period, which results in the common low-speed jerking. This is a normal phenomenon. The reasons for a car's jerking sensation are as follows: 1. Upshift Jerking: This occurs because the transmission's response speed is not fast enough, and the upshift speed cannot keep up with the throttle input, leading to a jerking sensation during the moment of gear change. 2. Downshift Jerking: This is mostly due to the intervention of the energy recovery system. Once the driver releases the throttle pedal or presses the brake pedal, the generator immediately starts working, imposing some load on the engine and affecting its speed. This causes the engine speed to become out of sync with the clutch plate speed, resulting in a jerking sensation.