Throttle fault performance?

Dirty throttle: vehicle idling jitter; Cold cars don't strike easily; The tachometer pointer is unstable at idle speed (unstable at idle speed). Cause: Oil vapor is the main cause. When the engine is running normally, there will inevitably be crankcase exhaust gas, especially when using low-grade engine oil, so there will be more. In a particular design, one of the crankcase exhaust systems is connected to the front of the throttle. Congratulations, it is very likely that some hot crankcase exhaust gas may return to the front of the throttle through the small hole. When idling, this hot crankcase exhaust gas gradually cools with the air inlet, and finally the temperature is so low that it becomes an oil film and is deposited near the throttle. Hehe, this oil film is helpful for further absorption of dust and plays a decisive role. On the other hand, the other path of the crankcase exhaust system is connected with the throttle valve, and the exhaust gas from this path will directly pollute all vacuum tubes, including the fuel regulator. There is also a very important reason: in the process of driving, high-grade and low-speed are indispensable, and idle speed is indispensable. At this time, the mixed gas containing hydrocarbons may sometimes flow backwards. Carbon deposition is inevitable when high-temperature hydrocarbons come into contact with low-temperature intake system components. This is also a common accelerator black mud. 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 dirty environment (especially windy and dusty conditions in the north), and rarely clean the air filter. 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 adjust the throttle opening with special driving computer. The cost ranges from 20 to 200 pounds. Malfunction of oxygen sensor: the acceleration of the vehicle is not smooth, even the fuel supply does not leave the vehicle, or it can only maintain a low speed and cannot increase the speed; Seriously damaged the car. Reason: It is very important to add inferior fuel, especially fuel containing lead, sulfur and impurities. Basically, a tank of oil is used up, and 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: You can only buy a new one in 4S, and it can't be repaired. The cost is about 1200. Don't forget to change gas stations (when you are away from home, you should pay special attention to small gas stations in other places to refuel), and even complain to him!