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Discussion Starter · #1 ·
I may be mistaken but isn't there a switch or sensor that sends a signal to the PCM from the AC compressor that tells the PCM the compressor has cycled on and therefore increase the engine's RPM's to compensate for the added drain on the engine? My RPM's at idle drop from 800 (AC comp. cycled off) to 400 or 500 when the AC compressor sycles on. There use to be very little change in RPM's as the engine speed would increase. Anyone know, and if so, what is the name of this thing and where is it located? 98' Duratec 24 valve
 

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I could be wrong, but I think the computer just knows that the A/C clutch has been engaged and it also senses the extra load and compenstates for it by opening the IAC more.

It almost sounds like your IAC valve isn't able to open up enough to compensate for the extra load.

My $0.02.
 

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Discussion Starter · #3 ·
Thanks, you and I are on the same page. Going to pull it off tomorrow and inspect and clean really well and see if that helps.
 
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