In many cases, the internal valve body is not damaged, but stubborn dirt and impurities appear inside the valve body, especially the accumulation of dirt and impurities in the valve body to form a blockage, which affects the effective adjustment of oil pressure and causes the problems of frustration, impact and slippage.

It is normal for the BMW 5 Series to feel a little frustrated. Usually, if the feeling is particularly obvious, it may be caused by the following reasons and needs timely maintenance:

1, the oil circuit is blocked.

2, the ignition is not normal

3. Dirt and impurities that are difficult to handle appear in it.

1. The oil circuit is blocked. Clean the oil circuit, nozzle, oil circuit and oil pipe.

2. The automatic car started, and there was a normal situation of frustration. If you want to accelerate quickly when driving, you need to step on the accelerator deeply. At this time, the automatic gearbox will automatically downshift to increase the engine speed, and then upshift when the speed reaches a certain height. After the upshift, because the speed will drop obviously, there will be a more obvious sense of frustration. This often happens in automatic transmission models with fewer gears, such as 4-speed automatic transmission models. After the automatic transmission vehicle starts, if you want to drive smoothly, you can lightly step on the accelerator at an appropriate time, and the transmission will automatically upshift. At this time, the sense of shifting is weak; If you want to maintain good acceleration performance, you need to step on the accelerator pedal deeply, and the automatic transmission will rise to a higher gear at a higher speed, at which time the shift frustration is obvious.

3, automatic start-stop plus dual-clutch gearbox, itself has this problem.

4. If the ignition is abnormal, replace the spark plug or high-voltage bag.

5. In many cases, the damage is not the internal valve body, but the stubborn dirt and impurities inside, especially the dirt and impurities inside the valve body gather to form a blockage, which leads to the inability to effectively adjust the oil pressure, leading to frustration, impact and slippage. At the same time, the problem of high gearbox temperature can not be ignored. High temperature will destroy the quality and friction characteristics of automatic transmission oil, increase friction and wear, and the noise of transmission will follow. At the same time, sludge (impurities or dirt) will also be produced inside the transmission (such as the valve body), which will cause the frustration and impact of the transmission. If the temperature exceeds120 C, the rubber sealing material will start to harden, which will eventually lead to leakage and reduce the hydraulic pressure. If the temperature is higher, the gearbox will start to slip, which will increase the temperature. (Audi and other high-end models will call the police and enter the gearbox protection mode. If it is not solved in time, the gearbox will be scrapped.