Why Replace Spark Plugs?

[Carolyn]

Reasons for replacing spark plugs: Spark plugs have a service life and can accumulate carbon deposits over prolonged use. If not replaced regularly, they may become damaged. Damaged spark plugs can directly cause issues such as electrical leakage in the vehicle's ignition system, increased fuel consumption, reduced power, and most importantly, difficulty in ignition, affecting the vehicle's normal operation. Severe spark plug erosion—indicated by pitting, damage, or melted electrodes—means the spark plug is ruined and should be replaced. How to determine if a spark plug is damaged: Remove the spark plug and inspect its condition based on the following visual characteristics. A normal spark plug's insulator skirt and electrodes appear grayish-white, grayish-yellow, or light brown. A properly functioning spark plug has a reddish-brown insulator skirt, with an electrode gap between 0.8-0.9mm and no signs of electrode wear. If the spark plug is fouled with oil or deposits but not damaged, it can be cleaned and reused. If the spark plug is severely damaged—showing pitting, black streaks, cracks, melted electrodes, etc.—identify the cause of the damage, fix the issue, and replace the spark plug. Additionally, if the spark plug appears sooty black, it indicates incorrect heat range selection, a rich fuel mixture, or oil leakage.