Stu.. it explains differences that air pressure has on boiling point of water. The real explanation I'm searching for is how altering the FLOW of air equates to 'simulating' an altered density of air. how is flow related to density??
i understand how air is thinner as altitude increases, etc. i'm just not sure how to wrap my mind around restricting flow = less density (as far as the computer knows)
I DID find this useful though.. I went to yahoo search and typed "how does a MAP sensor work" and ran across this on a page:
Function
The MAP sensor monitors pressure changes (vacuum) in the manifold. As the pressure changes, the voltage changes put out by the MAP sensor changes. The higher the vacuum or pressure is in the manifold, the lower the voltage put out by the MAP sensor. The voltage reading goes to the PCM, to tell the computer to advance or retard the ignition timing as needed.
Types
There are two types of MAP sensors. The typical MAP sensor senses pressure (vacuum) in the manifold. The second type of MAP sensor helps the PCM estimate air flow in addition to pressure changes in the manifold. This type of MAP sensor is found on vehicles with speed density fuel injection.
Seems as though you have the second type on your zx2
what type of car is the 'other car?'
and the excort had a much more basic electronics setup than Russ' truck. (for example)
it has everything needed to be 'emmisions compliant' and obd2 compliant, etc.. but there's DEFINITELY not much trickery involved like what russ ran into to make the computer (in your car) act how you want it to act.
Ford has always subscribed to the KISS philosophy with the electronics in their cars (i can attest to this first hand)
mike
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