driftxsequence

iTrader: (8)

I am laying out my harness as described in aaron cake's walk through. However he makes no mention of which output a gm iac would use, just a stock bac valve. I know it is not a pwm device, its a stepper motor so what i am looking to verify is that i run a "stepper out" to the iac instead of the pwm/idle control wire.

Shainiac

iTrader: (7)

You'd have to follow the manual for building up a 4 wire stepper IAC. What ECU are you using? I've always used the 2-wired Mazda PWM valve and it works well for cold start, but I've had some experience tuning the GM valves and they are nicer for sure.

spokanerxdude

iTrader: (4)

The ms3 is farly easy, I think the other are more work. The MS3X/V3.0 or V3.57 Hardware Manual has the wire diagrams for the 4 wire IAC and the main board of the MS3.

driftxsequence

iTrader: (8)

Thanks, ill look back through the manual. Its a ms3pro setup

Aaron Cake

iTrader: (1)

GM stepper IACs are in the MS3-Pro manual so you can follow the connection diagram there. The wires are the blue and green wires on the gray connector.

muythaibxr

I would use the stock valve or a 3-wire pwm valve. They work better.