You would not believe how many conflicting wiring schematics I've read regarding a 454 TB going on a 350/305. It seems to me that the conflict may be partially due to what ecm you're running. I'm running a 7747 which was the same that the 7.4L trucks used. Based on that, I'm going to wire mine up A-A, B-B, etc. at the plug. (won't be done till spring though) If anybody knows for sure, could they please post here and could this maybe become a sticky or something? There are SO many posts about this topic and the question keeps coming up because they contradict each other.

Very Thankful,
Mike

 

same ecm I have ..I just posted my findings

https://www.thirdgen.org/techbb2/sho...hreadid=271444

I cut my iac plug off a 97 s10 with 4 cylinder

the colors match my colors on my truck with the way I poted it to be wired

Gm dont change their colors so all iacs with that plug should be same order

 

http://www.turbocity.com/product_inf...products_id=50

http://www.turbocity.com/product_inf...products_id=44

 

I forgot to put this before, in case anybody was wondering.....The flat 4-prong connectors for the 454 TB are also available on some dodges. I got one off a 3.0L Dodge Spirit I was scrapping. The wires are not the same colors, but it plugs in. A 95 Dodge Van I have has some on it too.

 

NOW THIS IS THE 1984 VETTE CROSSFIRE "STOCK " HARNESS WITH A 7747 ECU.

TPS....
CF wire harness - 454 sensor position
blue driver front
black driver rear
grey pass front

IAC
blue/black top most
blue/white "
green white "
green/black bottom most

454 harness(s) tps/iac were GM 1995.

seemed to work well. the GM TBI truck service manual was in error/incomplete.