Does the car spark plug work all the time?

[Deanna]

When the car is running, the spark plug works continuously. Working principle of spark plug: The ground electrode of the spark plug is connected to the metal shell and is connected to the engine block through the cylinder head thread. The insulator mainly serves to isolate the metal shell and the central electrode. The terminal nut is the part of the spark plug that contacts the high-voltage coil. After the current passes through the terminal nut and the central electrode, it breaks down the medium between the central electrode and the ground electrode to generate a spark, thereby igniting the mixture in the cylinder. Spark plug replacement cycle: Under normal maintenance conditions, it should be replaced after driving 40,000 to 60,000 kilometers. However, due to differences in brands and engines, it is recommended to follow the user manual. The following standards can be referred to for maintenance replacement: Platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers.