|Originally posted by craigsfiero2007:|
... manifold absolute pressure sensor ... used to monitor the difference in pressure between the intake manifold at outside atmosphere.
Close, but no cigar. Whet you described would be a differential
pressure sensor. The MAP measures absolute
pressure in the intake manifold ... i.e. manifold pressure with respect to a perfect vacuum. Absolute pressure is directly related to the density of the air in the intake manifold.
[This message has been edited by Marvin McInnis (edited 02-20-2008).]