MSefi.com read only forum (Jan.15,2018)

Hello,

Background: 4.3 chevy TBI
MSII v3.0 with stock sensors (except MAP, which is the one that came with MSII).
DIYAutoTune 10 foot harness

The IAC sensor is the 4 wire stepper (2 rows of 2) and is not only labeled with and "A" side and a "B" side.

I am not sure if I have the IAC wired correctly (engine started at 1900 rpm and as it warmed up increased to 2200).
I have noticed that there are a few different diagrams out there for how to wire the IAC.

I wired it according to this diagram:
https://www.google.com/search?q=megasqu ... dPDRP_M%3A

Question 1): Is this the correct way to wire the gm 4 wire (2 rows of 2) IAC stepper motor?
Question 2): Can someone explain how this stepper motor is labeled so that way I know which wire on the connector is 1A, 1B, 2A, 2B?

Will

I'm no expert and I haven't gotten mine to work yet but I think you look for the pairs (on the iac) that have matching resistance. Then you have to figure out witch ones open and close.

John

This. Check for cintinuity between any two pins. If they're connected, you have a pair; otherwise it's the other pin next to it.