The essence of the Mazda MPV Throttle Body is to measure the air flowing into the engine in order to allow the Mazda computer to add an appropriate quantity of fuel to the air to create comfortable power. It is installed between the intake manifold and the air filter, and its butterfly plate opens in direct proportion to the driver's accelerator input in order to allow additional air to flow and initiate or increase injector pulse lengthening to provide additional fuel. The minivan featured a Throttle Body injection unit or all-in-one unit made up of one or two fuel injectors, a pressure regulator and the throttle plate below the original air cleaner, providing a cost-effective transition between carburetors and modern injection. In later periods the MPV subsequently incorporated independent multiport injectors, with the Throttle Body itself left to air ingress with sensors, including the throttle position sensor and an idle air control port, providing continuous feedback to the PCM to maintain steady idle and low emissions. Mechanical cable linkages were also replaced by electronic throttle control or drive-by-wire, whereby the two pedal sensors and an electric motor rotate the plate to enhance safety features and remove sticking cables. The owners of Mazda continue to enjoy cold starting and high fuel mileage, and periodic cleanup of deposits or replacement of worn shafts bring back sharp response. This allowed Mazda to make parts modular even with high mileage, resulting in the ability to replace individual sensors or motors without replacing the whole unit.
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