What's the matter with car tempering?

Bian Xiao is about "What happened to car backfire?" Provide you with the following related contents:

Reasons for automobile tempering:

1, the engine runs normally, divided into four steps: intake, compression, work and exhaust. Tempering;

2. Generally speaking, in the cylinder, after the piston does a good job, the burnt exhaust gas should be discharged from the exhaust pipe, but due to some fault, the exhaust valve has been closed, so it is impossible to discharge the exhaust gas, or it is too late to discharge the exhaust gas;

3. Then the exhaust gas will be discharged from individual cylinders in the cylinder head, crankcase, carburetor, throttle and other places, which is what we often call "backward flow", that is, engine tempering. When the throttle is released to slow down, tempering is more frequent.