How Many Car Spark Plugs Should Be Replaced at Once?

[StCassidy]

Spark plugs should be replaced all at once. The discharge gap between new and old spark plugs differs, as does their resistance. Not replacing all of them may lead to issues like engine shaking, difficulty accelerating, and increased fuel consumption. Spark plugs have a certain lifespan, and products from the same batch should have similar quality and longevity. If one or two spark plugs show problems, it indicates that the others are nearing the end of their lifespan as well. Spark plugs, commonly known as sparkers, function by discharging the high-voltage pulse electricity sent through the high-tension leads, breaking down the air between the two electrodes to generate a spark, thereby igniting the air-fuel mixture in the cylinder. The main types of spark plugs include standard spark plugs, projected insulator spark plugs, electrode spark plugs, seat spark plugs, pole spark plugs, and surface gap spark plugs.