Unlike diesel engines, gasoline engines do not have spark plugs or an ignition system because spark timing is controlled by the fuel injection system.

Question

Quizplus · Accepted Answer

Gasoline engines do have spark plugs and an ignition system to ignite the air-fuel mixture, unlike diesel engines which use compression ignition. The fuel injection system in a gasoline engine controls the amount of fuel that is injected into the cylinders, but it does not control the spark timing.

Unlike Diesel Engines, Gasoline Engines Do Not Have Spark Plugs