What does low-speed jerking mean?
2 Answers
Transmission jerking is the impact sensation caused by the inertia of moving parts inside the engine. Below is relevant information about transmissions: Main functions: Change the transmission ratio to expand the variation range of driving wheel torque and speed, adapting to frequently changing driving conditions while allowing the engine to operate under favorable working conditions. When the engine's rotation direction remains unchanged, it enables the vehicle to only move in reverse; by using neutral gear, it interrupts power transmission, allowing the engine to start, shift gears, and facilitating gear changes or power output in the transmission. Working principle: Manual transmissions mainly consist of gears and shafts, achieving speed and torque variation through different gear combinations; while automatic transmissions (AT) are composed of torque converters, planetary gears, and hydraulic control systems, achieving speed and torque variation through hydraulic transmission and gear combinations.
Low-speed jerking refers to the sensation of your car suddenly lurching or jerking when driving at low speeds, such as during traffic jams or when starting off. This is mostly caused by issues with the automatic transmission, such as deteriorated transmission fluid, low fluid levels, or clogged valve bodies, which result in rough gear shifts. The ignition system is also often problematic—for example, excessive carbon buildup on spark plugs or aging ignition coils can cause uneven engine combustion and lead to shaking. Carbon deposits in the engine can also cause trouble by accumulating in the intake passages and disrupting smooth airflow. I’ve found that regular maintenance is key, such as changing the transmission fluid every two years and inspecting the spark plugs. Ignoring this issue can wear down drivetrain components and make driving uncomfortable. I recommend taking your car to a professional shop for inspection as soon as you notice any jerking—don’t wait until it turns into a costly and frustrating major repair.
