[Diy_efi] IAC Motor Wiring

[Robert W Hughes]

This motor is a stepper motor, both coils are used to move in either 
direction. Worst case, assuming you get polarities correct, if the coils 
are switched, the motor will run in the wrong direction - in instead of 
out, etc. Just switching the two coils would correct that.

> The Magnum IAC is a stepper motor design, unlike the earlier TBI parts.
> This is a dry TB, part of the Magnum multiport arrangement.  I think I left
> that tidbit out of my previous post.  I'm so used to thinking about my
> particulars, I forget to explain what I'm doing some times...
> 
> '7730 multiport injection on Mopar M1 Magnum 4-bbl intake, majority GM
> sensors, with some Mopar sensors where needed to work on the TB, Mopar fuel
> rails, 24# injectors, Mopar locked (lean-burn) distributor feeding a GM
> ignition module in a remote box.
> 
> Other than the connector on the end, and the way it mounts to the TB, the
> Magnum IAC appears functionally identical to the IAC I have on my GM TB
> (converted to dry from a 454 TBI application).  The "LT" engines' IACs
> appear to be almost entirely identical to the Mopar part, but the wiring
> doesn't seem to be the same.  I'm just wanting to find out if one of the
> coils is responsible for extending the piston, the other for retracting, or
> if they both do the same job...


-- 
Robert W. Hughes (Bob)
BackYard Engineering
29:40.237N, 95:28.726W or perhaps 30:55.265N, 95:20.590W
Houston, Texas "The city with too much Oxygen"
rwhughe at oplink.net
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