Edelbrock Pro-Tuner, User Manual

Page: 43 / 235

Installation and Setup 43
3.2.3.4 Manifold Absolute Pressure Sensor (MAP)
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Manifold Absolute Pressure (MAP)
Installing / Replacing the Manifold Absolute Pressure (MAP)
sensor
The MAP sensor measures pressure in the intake manifold. (A pressure below
atmospheric is typical in a running engine, and is sometimes called vacuum when the
value is referenced to atmospheric baseline.) The manifold pressure is low (high-
vacuum) in a light load condition, while in a high load condition – the pressure will rise
(low vacuum). Manifold pressure provides the ECM information that helps the system
determine the load on the engine so the appropriate output changes are calculated and
executed.
The MAP sensor must have an unobstructed signal to the intake manifold plenum: either
at the throttle body below the throttle blades, or in the plenum itself. A small bracket is
supplied to mount the MAP sensor to one of the 4 throttle body hold down bolts/studs. A