Issues in this issue:

　　1. If the air filter element is not replaced, why does the fuel consumption increase?

　　2. Why does fuel consumption increase when high-viscosity engine oil is used?

　　3. The oxygen sensor is broken, how does it cause the car's fuel consumption to increase?

　　4. Why does the fuel consumption get higher and higher when the brake cylinder is locked?

　　5. Why does fuel consumption get higher and higher without changing the spark plug?

　　1. The engine air intake is insufficient, and there is a large amount of carbon deposits on the throttle valve and intake port. How does it lead to higher fuel consumption?

　　Do not replace the air filter element for a long time

　　If the air filter element is not replaced for a long time, when the engine takes in air, the resistance will increase and the air intake will decrease. If there is a large amount of carbon deposits on the throttle valve or intake duct, the airflow will be unstable when the engine sucks in air. These conditions will lead to insufficient intake of the engine and insufficient combustion. At this time, the trip computer will ensure the normal operation of the engine. If you issue instructions to inject more fuel, this cycle will waste fuel, and the car's fuel consumption will become higher and higher. Therefore, it is very necessary to replace the air filter element regularly and clean the throttle valve and the carbon deposit in the intake port;

　　2. Why does fuel consumption increase when high-viscosity engine oil is used?

　　High viscosity oil increases the internal running resistance of the engine

　　Some car owners blindly believe that as long as you choose a higher viscosity oil, it will be better for the car's engine, but this is not the case. I have mentioned this many times in previous programs, such as the camera brother. Nissan Tiida, its user manual clearly requires the use of 0W-20 oil, but if this Tiida is replaced with 5W-40 oil, the oil flow in the engine will slow down and increase The running resistance of the internal parts of the engine;

　　Read more on-board user manual

　　Then in order to ensure that the engine has sufficient power output, the trip computer will increase the fuel injection to maintain power, which indirectly leads to an increase in fuel consumption, so do not choose to add oil randomly, and be sure to follow the oil requirements in the maintenance manual. Choose the engine oil by label. I have a detailed operation process in the 86th episode of "Car Brother" (44S shop does maintenance and cut corners? I will teach you the complete car maintenance process, but not just change the oil). I hope to help you;

　　3. How does the oxygen sensor fail to increase the fuel consumption of the car?

　　Mixed gas gold ratio

　　The main function of the oxygen sensor is to detect the oxygen concentration in the exhaust gas and feed back the oxygen concentration signal to the trip computer. The trip computer will control the amount of fuel injection based on this signal, so as to control the air-fuel ratio of the mixed gas in the engine combustion chamber as far as possible to 14.7 : 1 This golden theoretical value. If the oxygen sensor fails, it will not be able to feed back the correct oxygen concentration in the exhaust to the trip computer, and the trip computer will not be able to correctly control the fuel injection volume of the engine;

　　Regularly check the oxygen sensor

　　In order to ensure that the engine does not turn off, the trip computer will select multiple fuel injections to keep the engine working normally. This will increase the fuel consumption of the car. So I recommend checking or replacing the oxygen sensor for 150,000 kilometers, or the engine failure light is on. At the time, you should check the oxygen sensor carefully. If it is broken, replace it as soon as possible. In fact, it’s easy to replace it yourself. I’m in the 11th episode of "Brother Cars" (Reduce Fuel Consumption! Start by replacing the oxygen sensor yourself. "(Video)), there is a detailed process;

　　Fourth, the brake cylinder is locked, why does it increase fuel consumption?

　　The brake cylinder is locked

　　The lock of the brake cylinder is like keeping on the brakes while driving. The brake pads are always rubbing against the brake disc, so that the resistance of the car will increase when driving. Normally, the car can run without stepping on the deep accelerator. After locking, you have to step on the accelerator deeply to ensure that the car has enough power, so the natural fuel consumption has risen sharply. In this case, you need to check and replace the brake cylinder. Power difference, the brake is too soft? Replace the brake cylinder by yourself and solve the problem in 10 minutes.) There is a detailed operation process, which will definitely help you;

　　Wrong driving habits

　　Another situation is that there is a problem with driving habits, because some car owners like to step on the accelerator pedal with one foot and the other on the brake pedal when driving, so that when the car is driving, it is equal to Running on the brakes will also increase the fuel consumption of the car. Although this driving habit cannot be understood, it does exist in real life. This habit is not only bad, but also very, very, very dangerous, so we must change it. !

　　5. If the spark plug has not been replaced for a long time, why does the fuel consumption get higher and higher?

　　The ignition performance of the spark plug is degraded

　　We all know that the main job of the spark plug is to ignite the mixed gas in the engine cylinder. The mixed gas allows the engine to generate power. If the spark plug is not replaced for a long time, the ignition performance will gradually decrease, and the ignition will fail gradually one day. Unable to ignite the mixed gas, so that not only the injected fuel will be wasted, but also an ignition cycle will be wasted, and the engine will suffer from cylinder shortage, misfire, and jitter;

　　The service life of different spark plugs

　　There are many types of spark plugs. The lifespan of common ordinary copper core spark plugs is only 20,000 to 40,000 kilometers. The lifespan of platinum spark plugs is generally 60,000 to 80,000 kilometers. The service life of iridium spark plugs is generally 80 to 120,000 kilometers. Some car owners replace the spark plug with the midpoint of the spark plug life. If the piston deposits too much carbon, or the spark plug is damaged by external force, it will affect the service life of the spark plug. Therefore, it is best to check the spark plug once at 10,000 to 20,000 miles. The spark plug is found to be abnormal during the inspection, and it can be replaced at the first time. Things can be done easily by themselves.