For smooth running and proper combustion, an MX5 NB (1998 - 2000) must continuously receive the proper ratio of fuel to air. The gasoline mixing system consists of several components that dose, atomize and match fuel to the amount of air drawn in. Injectors, pressure regulators and sensors play an important role in this process. Even a small deviation in fuel delivery can be noticeable in idling, throttle response or fuel consumption. Final combustion is determined not only by fuel, but also by the amount of air entering the engine through the intake system, so the two systems are closely linked. Precisely because all components work so closely together, malfunctions are sometimes subtle but immediately noticeable while driving.