Thanks! What purpose does it serve? I have replaced the TPS and will
be replacing the IAC to try to solve a problem that causes my truck to
stall when idling. Except for idle, the truck runs very well.
Well.... it measures the absolute pressure in the manifold. :)
For the non-smart-ass answer - it's used by the computer to determine how
much fuel to feed. By measuring the density of the air in the manifold, the
computer knows how much air is entering the combustion chambers, and knows
how much fuel to mix in to maintain a proper air:fuel ratio.
Problems with the MAP sensor usually will set a diagnostic code, and would
be fairly far down on the list of possible things gone wrong when an engine
won't hold idle. The IAC motor that you're looking at is a far more likely
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