Why Does an Automatic Transmission Car Jerk When Starting?
2 Answers
If you want to accelerate quickly while driving, you need to press the throttle deeply. At this point, the automatic transmission will automatically downshift to increase the engine speed. When the speed reaches a certain level, it will upshift. After upshifting, because the speed will drop significantly, a relatively noticeable jerking sensation will occur. More relevant information is as follows: 1. After starting an automatic transmission vehicle, if you want to drive smoothly, you can lightly press the accelerator pedal at the appropriate time. The transmission will then upshift automatically, resulting in a weaker shifting jerk. 2. If you want to maintain good acceleration performance, you need to press the accelerator pedal deeply. The automatic transmission will upshift to a higher gear at a higher speed, resulting in a more noticeable shifting jerk.
When I first started driving, I also experienced jerky starts with the automatic transmission—it felt like the car stepped on the gas and then suddenly held back. The main reasons could be old or dirty transmission fluid causing rough gear shifts, or issues with the engine's fuel delivery system, such as clogged fuel injectors. It might also be due to sluggish brake or throttle sensors, resulting in delayed response. If this happens frequently, it can affect driving safety, especially in congested areas where it increases the risk of rear-end collisions. My advice: don’t ignore it. Regularly changing the transmission fluid (usually every two years) is cost-effective, hassle-free, and ensures safety. If you can’t handle it yourself, take it to a reputable shop for inspection to prevent minor issues from turning into major repairs. Looking back now, maintaining a car is just like taking care of your health—it requires diligence.
