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Is a map sensor the same thing as mass air flow on 1991 ford ranger truck?

No, a MAP sensor (Manifold Absolute Pressure sensor) and a MAF sensor (Mass Air Flow sensor) are not the same thing, even on a 1991 Ford Ranger. They both measure aspects of the air intake, but in different ways:

* MAP sensor: Measures the pressure in the intake manifold. This indirectly helps the engine computer determine how much air is entering the engine. It's used in conjunction with other sensors (like throttle position) to calculate air density.

* MAF sensor: Directly measures the *mass* of air flowing into the engine. This is a more direct measurement than the MAP sensor's indirect approach.

Many older vehicles, like some 1991 Ford Rangers, might use a MAP sensor instead of a MAF sensor. Others might use both, but for different purposes. A 1991 Ranger's engine control system will rely on one or the other (or potentially both, in a more sophisticated setup). You'd need to consult a wiring diagram or repair manual specific to your *exact* 1991 Ford Ranger model and engine to be certain.

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