How many spark plugs are in a 4 cylinder?
How many spark plugs are in a 4 cylinder? In most cases, there are four plugs. Each plug ignites the fuel/air mixture in one cylinder. However, there are engines that use two spark plugs per cylinder. This ignites the fuel/air mixture in two places at the same time. This is useful if the plug placement isn’t ideal, or the manufacturer need to get more complete combustion to lower emissions and improve power. Many Nissan four cylinder engines use 8 spark plugs, as well as the 2.3 liter used in some Fox body Mustangs.