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If you take a look at the IAP sensor on the x-pect it is between the throttle valve and the intake manifold so how does that give you the atmospheric pressure when it is working from almost a vacuum to near atmospheric pressure depending on the throttle position and the engine load. I sort of felt that that pressure sensor was sort of an advance warning to the EFI system as to where the RPM's were in relation to the throttle valve so as to supply more or less fuel. With RPM's rising on a flat road throttle valve will be closing and pressure in the inlet manifold will be dropping into more of a vacuum where Rpm's dropping on a hill with the throttle valve opening would be increasing the pressure to the IAP. So does this sensor really do anything about altitude or is altitude just handled by the O2 sensor in a closed loop.
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