Older fuel injection systems (multiport or gang-fired systems) were able to provide an air-fuel mixture within an accuracy of about 2% of stoichiometric.
In order for the engine to function properly, an air-fuel mixture must be made up of air and fuel (most often, gasoline). This mixture must be mixed in a particular ratio. Every gasoline engine uses a suction process to draw in air and fuel, and then the mixture burns (or combusts) using sparks to produce combustion.
Throughout the process, the engine's operating environment will change. The speed of the engine will depend on the input of the air-fuel mixture because it will be run at slow, high, and medium speeds at different times. As a result, the different air-fuel mixture require different engine speeds.
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