How often do spark plugs and solar terms need to be cleaned?

Ordinary copper spark plugs need to be replaced every 30 thousand kilometers, and precious metal spark plugs (platinum, iridium, etc. It needs to be replaced every 60,000-90,000 kilometers. If it is not replaced regularly, it will make the cold start of the car more difficult, and there will be obvious frustration and idling jitter during driving, and the phenomenon of idling spontaneous combustion often occurs, and the acceleration performance of the engine will decrease, the power will be insufficient, and the fuel consumption will increase.

The throttle valve needs to be cleaned regularly, generally 20000 km 1 time. If the throttle is not cleaned regularly, the resistance of the throttle switch will increase, resulting in unstable engine idle speed.