Spark plugs are important components of the ignition system in gasoline engines. They can introduce high-voltage electricity into the combustion chamber and cause it to jump over the electrode gap to generate sparks, thereby igniting the combustible mixture in the cylinder. It mainly consists of wiring nuts, insulators, wiring screws, central electrodes, side electrodes, and the shell, with the side electrodes welded to the shell.

The replacement cycle of spark plugs is directly related to their material. The replacement cycle of nickel alloy spark plugs is 20000 to 30000 kilometers, nickel yttrium alloy spark plugs are 30000 kilometers, single platinum spark plugs are 40000 kilometers, double platinum spark plugs are 60000 kilometers, iridium spark plugs are 80000 kilometers, and platinum iridium alloy spark plugs can reach 100000 kilometers.