Quote:
Originally Posted by justpassntime
No, there is a definite difference. They are totally separate sensors. Manifold Air Pressure sensor senses the air being pulled into the throttle body to adjust fuel ratio for engine demands. More air more fuel. The atmospheric or barometric pressure sensor (name depends on manufacturer) senses ambient pressure (altitude) for optimum fuel/air ratio. Less air pressure (higher altitude) less fuel.
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Do all cars have these? I had never seen or heard of one before, I don't believe either of my cars has one.