What Causes the Jerking in BMW 530?
3 Answers
Check if the transmission temperature is normal. If not, inspect the transmission cooling system. Reprogram the transmission control unit. Replace the transmission fluid. Examine whether the internal valve body of the transmission is damaged. Transmission Overheating: Transmission cooling issues, poor transmission cooling can lead to abnormally high transmission temperatures, affecting the performance of the transmission fluid. Moreover, if the temperature exceeds 120°C, the rubber sealing materials in the transmission can harden, causing leaks, which in turn affects oil pressure and results in jerking. Contaminated Transmission: Internal dirt and debris in the transmission. Contamination or debris can prevent effective regulation of transmission fluid pressure, leading to jerking.
I also experienced jerking issues when driving my old BMW 530, mainly that tugging sensation during low-speed gear shifts. This problem is typically related to the transmission system. Although BMW's ZF 8AT is reliable, over time the transmission fluid deteriorates, causing valve body sticking or solenoid valve malfunction. During my last visit to the repair shop, they detected metal particles in the transmission fluid - replacing the fluid significantly improved the situation. Outdated electronic control module software can also affect shift smoothness, so I recommend using a computer to read transmission error codes. In daily driving, avoid frequent hard acceleration and braking; treating the throttle gently can alleviate jerking. If it's particularly noticeable during cold starts but disappears after warming up, that's still within normal range.
My 530 started experiencing acceleration hesitation after 40,000 kilometers, especially during startup and uphill driving. Upon careful inspection, we found issues with the engine ignition system - two cylinders had severely carbon-fouled spark plugs, and the ignition coils showed signs of aging and electrical leakage. The mechanic explained that BMW's direct injection engines are prone to this - frequent low-speed city driving leads to carbon buildup clogging the injectors, causing incomplete combustion and resulting in jerky performance. Now I regularly use fuel additives and clean the intake tract every 20,000 km. A dirty mass airflow sensor can also cause similar problems - after cleaning it last time, the idle vibration disappeared completely. Reminder to everyone: don't underestimate fuel quality - using gasoline below 95 octane can easily cause knocking and hesitation.