Why is the car engine light on?

[LaLorenzo]

Car engine light is on due to unstable operating conditions. Here are some introductions about car engines: 1. Fault: Difficulty starting when the engine is cold or unstable operating conditions after starting, may be accompanied by stalling or the pollution light turning on. Sometimes after restarting, the engine vibration and pollution light disappear, and sometimes after restarting, the engine vibration is normal but the pollution light remains on. 2. Principle: The process of converting chemical energy into mechanical energy is a reaction of thermal energy. When the engine starts cold, the cylinder walls and other components are cold metal parts. As the engine operates, the fuel injected by the injector into the cylinder atomizes. The atomized mixture condenses on the cold cylinder walls, which is not conducive to engine ignition and combustion.