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A MAP sensor is an anacronym for "Manifold Absolute Pressure" sensor. The sensor has a vacuum line going to it from an intake manifold vacuum port. It senses the amount of intake manifold vacuum or pressure depending on how far open the throttle (your foot) is when you drive. Wide open throttle-foot to the floor, dictates low vacuum in the intake manifold. This device is all part of your engine electronic control devices/sensors used to make your engine run at peak efficiency and perform its best.

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