Xfi 2.0 question on lt1

[Jeff Niceswanger]

Originally Posted by L.Fite

Got it...
Kinda what I suspected...
Is it tied physically to the throttle shaft or just lean/rich the mixture via controlled air leak?...

A friend resto-modded his street car with an LS-X and it hunts at idle...
Doesn't really seem to run like I would have expected a computer controlled car to run.
Seems rich all the time too...

Sorry for the questions but I really don't know anything about modern fuel injection.
Trying to learn.

If it ain't got pills or jets I'm lost!...

Its hunting because its not adjusted right, but big cammed cars and IAC are a challenge. The IAC has to be timed and adjusted to match up with the basic fuel map. The IAC is a little stepper moto or servo. It has a pindle, basically a big needle like in a needle and seat of a carb. It screws itself backward and forward seating, unseating, screwing just a little bit out, or a lot out. The farther it backs out, the more air it allows to "Go Around" the throttle body plates which in turn increases or decreases rpms. Thays about it, their isn't much to them