What are the functions and roles of spark plugs?
2 Answers
How spark plugs work: The ground electrode of the spark plug is connected to the metal shell, which is threaded into the engine block through the cylinder head. The insulator primarily serves to isolate the metal shell from the center electrode. The terminal nut is the part of the spark plug that contacts the high-voltage coil. When current passes through the terminal nut and the center electrode, it ionizes the medium between the center electrode and the ground electrode to generate a spark, thereby igniting the air-fuel mixture in the cylinder. Spark plug replacement intervals: Under normal maintenance conditions, spark plugs should be replaced after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it is recommended to follow the user manual. The following standards can be used as a reference 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.
I've been driving for over ten years, and spark plugs are the key ignition component in the engine. They generate sparks to ignite the gasoline-air mixture, enabling the car to start. If a spark plug fails, the car may shake, consume more fuel, or even fail to start. I learned this the hard way one year when I forgot to replace them and broke down halfway. The mechanic found it was due to aged spark plugs and advised changing them every few tens of thousands of kilometers—it's not worth skimping on. Pay attention to unusual engine behavior, like slow acceleration or unstable idling, as these could indicate spark plug issues. Replacing spark plugs isn't difficult; you can do it yourself or visit a professional shop, but don't delay until bigger problems arise. Regular maintenance can extend engine life and save fuel.
