Edelbrock 3670 User Manual - page 43

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