What does car backfire mean?

[MilesRose]

Car backfire actually refers to intake manifold backfire. Here is the relevant introduction about car backfire: 1. Intake manifold backfire: Intake manifold backfire is caused by insufficient fuel supply and overly lean air-fuel mixture. The overly lean mixture slows down the combustion speed, causing the combustion to continue until the end of the exhaust stroke when the intake valve opens. The fresh air-fuel mixture encounters the unburned exhaust gases in the cylinder and ignites, flowing back through the intake manifold and spraying out from the intake port, resulting in backfire. 2. Precautions: When performing cutting or welding work during car maintenance, wear protective goggles. Additionally, wear a protective mask during spray painting operations to ensure personal safety.