Troubleshooting of Driving Jitter of BMW 523Li Car Mar 16th, 2018   [viewed 65 times]

 

The 2008 BMW E60 523Li sedan with a mileage of over 226,000 km and a 6HP-21 transmission. The vehicle's small throttle 2 to 3 engine speed VAS 6154 when the 1800 ~ 2000r/min, 20-30km / h when the car shakes, in the four-speed engine speed at 2200r/min, 50km / h or so when the occasional continuous jitter, Like a small, very small continuous deceleration belt, it is not shaken (feeling that the lock-up clutch in the torque converter is not working well), and the large throttle 1-6 stops the engine from 1000 to 3000 r/min without jitter phenomenon.

Fault diagnosis: back to the factory with Jinde KT600 decoder to read the fault code, the engine system is normal, the transmission cgdi prog system is normal, the road test reads the data flow is mainly read the torque converter lock case, found in the second gear when the torque converter The lock-up clutch display has been adjusted. At this time, the vehicle speed starts to fluctuate slightly from about 20km/h. When the data display is off, the car is normal. When the speed is 40km/h, the 3rd gear is changed and the data is displayed. At this moment, the car started to shake again, shake a few times, the data showed that it was closed, and the car immediately returned to normal. When the data show that the car has x300dp pad been adjusted to shake, show that the car has been closed to normal, when the throttle is almost 1000 ~ 3000r/min data shows that the car has been closed, the car is normal, which is more sure of the problem is the torque change point The lock is not good.

Troubleshooting: The problem is solved after replacing the torque converter.

Fault summary: personally think that this problem is the torque converter inside the friction plate and the lock plate work surface uneven or deformed, resulting in a combination of locking work is not true, resulting in this situation, when the high Xhorse ELV Emulator throttle engine speed high torque Larger, so the high oil pressure lock-up clutch is now firmly integrated. It has not waited until the pressure of the lockup clutch starts to jitter and enters the next gear, and then the lock-up clutch is started again. This way, if the throttle oil pressure is high, it will not be given. There is a problem with the lockup clutch, so there is no problem.