Hello, about 1, the function of air flowmeter: the air flowmeter is called L type in writing, which is a very important start signal. She and the crankshaft position sensor are two necessary signals for the car to start. There are also some cars that do not use air flow meters, but install an intake pressure sensor on the intake pipe, which is called Type D in writing (the function is the same, only one for each car). Through the air flow meter, signals such as intake air volume, intake air density and intake air temperature can be accurately transmitted to ECU (automobile computer). Automobile ECU gives the most suitable matching gasoline (sprayed through the fuel nozzle) through the transmitted signal, and gives the most ideal air-fuel ratio as far as possible (the ideal air-fuel ratio is 14.7: 1). ECU judges the concentration of combustible mixture according to the intake signal fed back by air flow meter, and makes adjustment. 2. Harm or influence of air flow meter: A high-end car can't run without the signal of air flow meter, because the ECU of the car can only determine the fuel injection amount according to this signal. Most cars (a few years ago) can still start running after unplugging the air flowmeter, but the speed can't come up. This working condition will not only make the car unable to run, but also bring many disadvantages, such as increased fuel consumption, excessive exhaust gas, serious carbon deposition, unstable idle speed and so on. 3. Can it last long? These hazards have been listed in the answer to the second question. Personal advice can't be ignored all the time, it must be repaired. 4. Influence of air leakage in the air intake pipeline: Assuming that there is no problem with the air flowmeter, air leakage in the air intake system will also have many effects, such as insufficient combustion air in the combustion chamber, resulting in unbalanced mixing ratio, increased gasoline fuel consumption, increased carbon deposition, excessive exhaust gas, and more importantly, the possibility of automobile knocking is greatly increased. Suggested solution: 1, go to the normal enterprise and use the decoder to eliminate the electronic fault code of the car first. Start the car, read the data flow, and determine whether the air flowmeter can be repaired (such as loose lines). If it cannot be repaired, it can only be replaced and re-equipped. Note: The cost of this flowmeter is not low. 2. Replace the air inlet pipe to eliminate air leakage. (In the long run, the fuel consumption and failure caused by non-replacement are far more than the replacement price, which is also a kind of peace of mind). The price of this accessory is acceptable and relatively low. Generally speaking, the big problem is the air flowmeter, which is really difficult to open and use without treatment. I played a lot, I hope it will help you.