What Causes the Low-Speed Jerking in BMW 525?
2 Answers
BMW 525 low-speed jerking is caused by engine oil passage blockage, with the focus on the engine. If the car experiences jerking while driving, the engine is definitely involved. The engine's ignition, air intake, and fuel injectors collectively determine fuel combustion, which is also the power source of the engine. If the air intake volume decreases, ignition weakens, or the fuel injection reduces, the power will be insufficient, leading to a jerking sensation. Notes: It is normal for automatic transmission cars to experience jerking during startup. If you want to accelerate quickly while driving, you need to press the accelerator deeply. At this time, 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 obvious jerking sensation will occur.
I've encountered similar issues while driving. The BMW 525's low-speed jerking usually has several common causes. The most common is dirty or insufficient automatic transmission fluid, leading to unsmooth gear shifts, just like an old machine running roughly without proper lubrication. Additionally, severely worn clutch plates inside the transmission can cause shaking during low-speed starts. In some cases, issues with the vehicle's control computer settings, such as programming bugs, can disrupt shift logic. I recommend first checking the transmission fluid condition and visiting a professional repair shop to read fault codes with a diagnostic tool. Don't ignore this problem, as prolonged jerking can damage more components, such as the gear system, leading to costly major repairs. When driving normally, avoid frequent sudden acceleration to reduce load. Regular maintenance is key—changing the fluid and conducting inspections every few tens of thousands of kilometers can effectively prevent unexpected issues.
