What is the reason for automobile tempering?

Tempering, in layman's terms, refers to the phenomenon in the engine cylinder. When the piston works, the exhaust gas will be discharged into the exhaust pipe. However, when the exhaust valve is closed or the exhaust gas is too late to be discharged, the exhaust gas will be discharged from individual cylinders such as cylinder head, crankcase, carburetor and throttle. This is what we call "underfilling", that is, the tempering of the engine. The main reason of automobile tempering is 1, and the mixture is too thin: the main reason may be the failure of oil circuit or air intake system. The main fault of oil circuit is that the fuel injection quantity of injector is too small, and the main fault is that the hydraulic pressure is too low or the injector is blocked. The main fault of the intake system is excessive intake air, which may be the fault of the sensor controlling intake air or the air leakage of the intake manifold. 2. There are problems in the incineration system: the main reason is insufficient incineration energy consumption, which may be due to excessive resistance of high-voltage lines, damaged incineration coils or insufficient power supply voltage, or failure of spark plugs. 3. Excessive incineration advance angle: The main reasons are improper clearance of crankshaft sensor (CKP), loose CKP, damaged temperature sensor, engine load or ECU. 4. Incineration advance angle deviates from the correct position too much: the main faults are backfire and firecrackers, and in serious cases, it is mostly caused by improper insertion of high-pressure pipeline of cylinder. If the phenomenon is not serious, but it happens intermittently, it seems to be regular, which may be caused by cracks in many metal distributors and fire between cylinders.