difference between stepper IAC and FIdle?

Seth23 · Post by **Seth23** » Thu May 18, 2006 12:04 pm

as the topic say, i dont get the difference for them, both are use for engine warm up?

bluetrepidation · Post by **bluetrepidation** » Thu May 18, 2006 12:24 pm

Both control idle speed during warmup. FIdle is simply a valve that opens wide to rev the motor while the IAC is a stepper motor that takes steps and closes slowly as the engine warms to hold the RPM throughout the warmup period. IAC is what all never cars run these days.

A.J.

Bernard Fife · Post by **Bernard Fife** » Thu May 18, 2006 12:39 pm

Seth23,

In addition to what bluetrepidation says, read this: http://www.megamanual.com/ms2/IAC.htm

Lance.

Seth23 · Post by **Seth23** » Fri May 19, 2006 12:44 pm

thx you very much, so i only have to choose between one of those if i get it right...
that was confusing because on the plan both were plug to megasquirt