07-08-2017, 08:59 AM
(07-08-2017, 08:13 AM)PowerDubs_imp Wrote:(07-08-2017, 07:45 AM)Aka Tsubasa_imp Wrote: If one really wanted to start digging into this they would piggyback a voltmeter to the IAC and see if the PCM is commanding an idle change just before it happens. If the PCM calls out the change as it happens then we could at least know that it a problem with engine mangement and not mechanical.
What if the pcm sends voltage, and the mechanical part doesn't respond as it should....
What if the pcm sends voltage, and the mechanical part doesn't respond as it should....
One could perform a resistance check on the IAC but without having a voltage to idle speed table (assuming no other engine operating defects) there is no real way I know to verify proper IAC operation. I believe some fancy automoblies have IAC's that have position monitors but don't quote me on that.
Upon further thought if you see a voltage change and no idle speed change, replacement seems warranted.