Camaro IAC help required

"Nibbles" (nibbles) 03/02/2018 at 21:13 • Filed to: Camaro

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Alright Opponauts, I’m putting a bounty out. 1993 Camaro Z28 IAC 4-pin connector. Square plug - NOT FLAT. Two green wires with white stripes, two green wires with black stripes. I understand that black is LO and white is HI, but how do I determine which is coil A and which is coil B? The bounty is fifteen-hundred internets.

The plug is disintegrated. There is no way for me to deduce, via placement or otherwise, the original wire order. 

Urambo Tauro > Nibbles 03/02/2018 at 23:40

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Are you sure they’re all green? I think if you clean the wires up, you might find some blue in there. The IAC wires on my truck (’95 350 TBI) are like that. I too thought they were all green at first.

I found a great pic in this eBay listing for a ’85-’92, but I’m pretty sure that it’ll fit your ’93 as well. If that’s the case, then this high-res pic from the ad might be just what you need.

If you turn the connector around so that you’re looking at the wire side of the plug, and the retainer clip is on top, then both blue wires are on top. W stripe on the left, BK stripe on the right. Below that, the green wires are the opposite: BK stripe on the left, W stripe on the right.

Don’t let the “A” and “B” on top of the connector in that pic fool you. That doesn’t mean coil A is both wires on the left, and coil B is both wires on the right. The bottom two wires are probably labeled “C” and “D”.

Nibbles > Urambo Tauro 03/03/2018 at 08:55

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Yeah I’ve got all that. I spent hours scrutinizing those cables but I’m also protanomalous. It’s never caused a blue/green issue before but maybe I’m mutating? I’ve cleaned and checked and cleaned and checked and they look identical :(

Urambo Tauro > Nibbles 03/03/2018 at 10:38

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Oh man, that sucks dude. If you can take a good close-up pic of the wires, we might be able to tell the difference from here. Maybe label all the wires temporarily “1, 2, 3, 4” with masking tape so that we can say “#2 goes to the upper left”, etc. Otherwise, you’ll need to get somebody else to take a look at it. I don’t know how one would go about identifying the right wires by poking them with a multimeter.

Nibbles > Urambo Tauro 03/03/2018 at 10:57

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Solved! Popped the PCM, traced, wired up, runs like a top!!!

Urambo Tauro > Nibbles 03/03/2018 at 11:11

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You traced them all the way to the PCM, huh? Wow, good job!

I didn’t think about doing it that way. I was all hung up on not knowing when and where to expect what kind of voltage at the IAC end of the wires.

Nibbles > Urambo Tauro 03/03/2018 at 14:17

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Thankfully the PCM is, like, two feet away. It was easy to get unhooked and test for continuity.