How to Clean Spark Plug Carbon Deposits?

[SanPaisley]

Soak the removed spark plug in carburetor cleaner, then use a copper brush to clean the residual carbon deposits on the surface. Below are specific details on how to judge the condition of a spark plug: 1. Tan or gray: If the insulator is tan, brown, or grayish-white, and the spark plug electrodes show minimal wear, such a spark plug can still be used for a longer period. 2. Black: If covered with black carbon deposits, which may even cause engine stalling in severe cases, these black carbon deposits indicate spark plug carbon buildup. If the carbon buildup is severe, it is recommended that the owner consider replacing the spark plug with a new one. 3. Black, moist, and shiny oil stains: If black, moist, and shiny oil stains appear, it indicates oil contamination on the spark plug surface. The owner can handle this issue themselves. Excessive oil contamination can make the car difficult to start, and the cause of the oil contamination should also be carefully investigated. 4. Scorched white: If the insulator skirt appears scorched white and the electrodes are burnt or damaged, the owner is advised to replace the spark plug immediately and not continue using it, as a damaged spark plug can easily lead to other issues.