What Causes the Jerking When Starting a Corolla?

[Venus]

Jerking when starting a Corolla is a normal phenomenon. When the engine speed reaches a certain level before upshifting, the speed will drop significantly after the shift, resulting in a relatively noticeable jerking sensation. Here is some additional information: Lightly press the accelerator pedal: This jerking issue often occurs in automatic transmission models with fewer gears, such as 4-speed automatic transmissions. After starting an automatic transmission vehicle, if you want a smooth ride, you can lightly press the accelerator pedal at the appropriate time, and the transmission will upshift automatically, resulting in a weaker shifting jerk. If you want better acceleration performance, press the accelerator pedal harder, and the automatic transmission will shift to a higher gear at a higher speed, resulting in a more noticeable shifting jerk. Cause of jerking: In many cases, jerking in an automatic transmission is not due to internal valve body damage but rather the accumulation of stubborn dirt and impurities inside, especially when these contaminants gather in the valve body, forming blockages that prevent effective regulation of oil pressure, leading to jerking, impact, and slippage issues.