Are Three-Prong Spark Plugs Fuel-Consuming?

[SanJanelle]

No, compared to single-prong spark plugs, three-prong spark plugs do not affect car fuel consumption. In fact, three-prong spark plugs are designed to avoid the cooling inhibition often seen in single-prong spark plugs. Once a three-prong spark plug ignites, the current will definitely pass through one of the three prongs. Therefore, three-prong spark plugs are only involved in the ignition process and do not participate in controlling fuel injection, so they have little impact on fuel consumption. They mainly affect the thoroughness of fuel combustion. How Spark Plugs Work: The ground electrode of a spark plug is connected to the metal shell, which is threaded into the engine block via the cylinder head. The insulator primarily serves to isolate the metal shell and the central electrode. The terminal nut is the part of the spark plug that contacts the high-voltage coil. Current passes through the terminal nut and the central electrode, then breaks down the medium between the central electrode and the ground electrode to produce a spark, thereby igniting the air-fuel mixture in the cylinder.