iacv = same as 'iscv' - idle speed control valve?
get a replacement from a scrapyard sounds like a good starting point, you
seem to know it's the problem! Unless in reality another sensor is
misreading information from it....
tried an ecu reset? disconnect battery for 10 minutes, reconnect, go drive
lightly for a while, then hard, then go sit in in park and idle it for 10
minutes, then voila, ecu has re-learned.
save yourself hours of time and buy genuine parts when it comes to engine
management,i bought a copy iscv and after hours of searching for other
causes it turned out to be the new part i replaced,so i bought a new
GENUINE FORD iscv and it cured my vehicle.
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