What are the reasons for the noticeable jerking sensation when driving the BMW X3 at low speeds?
2 Answers
The reasons for the noticeable jerking sensation when driving the BMW X3 at low speeds are: 1. Excessive carbon buildup in the throttle body, fuel injectors, and intake manifold; 2. Poor fuel quality leading to incomplete combustion; 3. Faulty spark plugs, ignition coils, etc., causing cylinder misfires. Taking the 2021 BMW X3 as an example, its body dimensions are: length 4717mm, width 1891mm, height 1689mm, wheelbase 2864mm, fuel tank capacity 65 liters, and curb weight 1860kg. The 2021 BMW X3 features a double-joint spring strut front suspension and a multi-link independent rear suspension, with a front-engine, four-wheel-drive layout. It is equipped with a 2.0T turbocharged engine, delivering a maximum horsepower of 184PS, maximum power of 135kW, and maximum torque of 290Nm, paired with an 8-speed automatic transmission.
I also experienced low-speed jerking issues when driving my BMW X3 before, especially when starting from traffic lights or in stop-and-go traffic where the car body shook violently, feeling like being kicked. This is usually related to the transmission. BMW's automatic transmission shifting logic is quite sensitive, and if the software is outdated or the clutch is worn and aged, it's prone to jerking. Carbon buildup on the engine's intake valves can also affect power output, leading to uneven performance. Additionally, if the transmission fluid hasn't been changed for too long, the viscosity changes significantly, which might also trigger this problem. I recommend going to a 4S shop to connect a diagnostic computer and read the fault codes—they can quickly pinpoint the cause. If not fixed, it will consume more fuel, and prolonged driving could easily burn out components. I've reduced a lot of trouble by maintaining my car regularly—don't wait until the problem worsens to take action.
