How to repair BMW x 1 throttle when it is broken, and the fault performance of BMW x 1 throttle.

Dirty throttle: vehicle idling jitter; A car that doesn't catch a cold easily; The indicator of tachometer is unstable at idle speed (unstable at idle speed).

Cause: Oil and gas are the main reasons. When the engine works normally, there must be some crankcase exhaust gas, especially when using low-grade engine oil. In a particular design, one path of the crankcase exhaust system is connected to the throttle valve. Congratulations, it is very likely that some hot crankcase exhaust gas will flow back to the throttle through the small hole. When idling, this hot crankcase exhaust gas gradually cools with the air intake, and finally the temperature is low enough to deposit an oil film near the throttle. Hehe, this oil film plays a decisive role in further vacuum pumping. On the other hand, another path of the crankcase exhaust system is connected with the throttle valve, and the exhaust gas discharged from this path will also directly pollute all real empty pipes. Include a fuel regulator.

There is also a very important reason: when driving, you should go up and down and slide in neutral. At this time, the mixture that may contain hydrocarbons sometimes flows backwards. When high-temperature hydrocarbons come into contact with low-temperature intake system components, carbon deposition will inevitably occur.

This is also a common black mud on the throttle.

There is also a secondary factor: the filtration performance of the air filter element decreases, which leads to the passage of dirty air mixed with impurities such as dust; Long-term use in a dirty environment (especially in the case of heavy wind and sand in the north), the air filter element is rarely cleaned.

Solution: use high-quality engine oil; Change the incorrect driving style before; In bad weather, clean the air filter frequently to shorten the frequency of replacing the filter. Go to 4S shop or professional repair shop to clean the throttle regularly, and use special driving computer to adjust the throttle opening. The cost ranges from 20 to 200 pounds. Fault of oxygen sensor: the vehicle does not accelerate smoothly, even if it refuels, the vehicle will not move or can only keep a low speed, and the speed will not go up; A badly damaged car.

Reason: It is very important to add inferior fuel, especially fuel containing lead, sulfur and impurities. Basically, when one box is used up, the oxygen sensor is scrapped. At the same time, your three-way catalytic converter may also be damaged, but this is a long-term accumulation process and will not be broken immediately! (Of course, the inherent quality defects of oxygen sensors are not excluded. )

Solution: It can only be replaced in 4S and cannot be repaired. The cost is about 1200.

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