What causes the jerking sensation when accelerating at low speeds in an automatic transmission car?
1 Answers
Automatic transmission cars experiencing jerking or surging during low-speed acceleration are often caused by engine-related issues. Additional details are as follows: 1. Engine function: Ignition, air intake, and fuel injection jointly determine fuel combustion, which is the power source of the engine. If the air intake decreases, ignition weakens, or fuel injection reduces, insufficient power output occurs, resulting in jerking sensations. 2. Situation explanation: Some jerking during automatic transmission vehicle acceleration is normal. For rapid acceleration, deep throttle application is required, causing the automatic transmission to downshift and increase engine RPM. When RPM reaches a certain level, upshifting occurs. Since RPM drops significantly after upshifting, relatively noticeable jerking may occur. This phenomenon is more common in automatic transmission models with fewer gears, such as 4-speed automatics. For smooth driving after starting an automatic transmission vehicle, gently pressing the accelerator pedal at appropriate times allows the transmission to upshift with minimal jerking. For better acceleration performance, deeper throttle application is needed, causing the transmission to upshift at higher speeds with more noticeable gearshift jerking.
