1, engine oil leaks.
Engine oil burning and oil leakage will occur in BMW from100000 km up and down, and it is more serious; If you go to the car 4S shop for maintenance, you must disassemble the engine and overhaul it. It is impossible to open the cylinder below 30,000. Not bad, this problem has been promoted by maintenance workers in China.
According to the fact that the valve oil seal can be removed and replaced without disassembling the cylinder, it can achieve good root removal or improvement, and only need to remove and replace some rubber products at the oil leakage position, such as cylinder chamber gasket, oil filter base gasket, relay sealing ring, engine oil pan gasket, etc.
2. The air conditioner does not cool.
There are also a large number of BMW buyers complaining that hundreds of thousands of BMW air-conditioning units are so sensitive. After 3-5 years of use, there will be common faults such as no refrigeration or poor intermittent refrigeration. If you go to the automobile 4S shop for maintenance, you will generally replace the refrigeration compressor, warm water inlet valve, air conditioning expansion valve, cooler, air conditioning evaporator, pipeline and so on. It's all five digits when you check out. In fact, most of them don't need to replace large objects.
3. Engine knock light
Under the condition of normal driving at various speeds, the light yellow fault light of the automobile engine lights up, which is a problem that many BMW car buyers often encounter, and the reply of 4s is also very vague. Generally speaking, it is the problem of refined oil. Most of them are adding fuel additives or cleaning throttle injectors, or even removing carbon deposits in the master cylinder.
Generally, this situation is a problem of carbon deposition, because the engines of BMW cars are turbocharged direct injection engines, and the intake system, cylinder and piston rod are very easy to deposit carbon. Except for the obvious need to clean the throttle, intake system and even the top of the piston rod. Usually, you can also be careful not to drive at a low speed ratio for a long time, or often at a constant speed.
4. Shift and accelerate
BMW ZF transmission equipped with AT is famous for its ride comfort and stability, but BMW 5 Series cars with a distance of more than 80,000 kilometers have a certain chance of this problem, which is mainly manifested in the feeling of shifting gears at low speed when the car is cold. Are there any common fault codes when general OBD and driving computer are used first? It is likely that the connecting wire of the transmission electrode is not firm, or it is obvious that the gearbox valve body has been damaged long ago and must be removed and replaced immediately.
5. Common faults of automobile idling jitter
This kind of situation is very common in BMW models, and rarely appears in new cars. Generally, after driving for a period of time, some factors are carbon deposition, but there are also many factors, so be sure to check the static data and feel the periodicity of vibration. In the engine compartment of a car, we can tell by auscultation whether it is different or not, and whether the engine block is different because of ignition. It may be that the spark plug of the car is brittle, or it may be that the spark plug of the auxiliary factory causes abnormal ignition kinetic energy. The key situation is carbon deposition caused by refined oil. The following aspects are the reasons why car buyers criticize BMW 5 Series for having too many problem wives.
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