What are the reasons for a car spark plug not firing?

[TylerLee]

The reasons for a car spark plug not firing are: 1. Wiring issues—check the external wiring of the spark plug; 2. Spark plug problems—inspect whether the electrode gap meets specifications and if there is excessive carbon buildup on the electrodes. The spark plug, commonly known as the sparking plug, functions by discharging the high-voltage pulse electricity sent from the high-voltage wire (spark plug wire), breaking down the air between the two electrodes to generate an electric spark, thereby igniting the air-fuel mixture in the cylinder. The main components of a spark plug are the insulator, shell, terminal stud, and electrodes. The insulator must have excellent insulation and thermal conductivity, high mechanical strength, and be able to withstand high-temperature thermal shocks and chemical corrosion. The material is typically 95% alumina ceramic.