Bringing TBI and Multi Port Fuel Injection to a New Level.     EFI Conversions and Tuning! Seattle to Portland! E-mail Tuning Consultant!
Results 1 to 2 of 2

Thread: Square to flat IAC plug

  1. #1
    Fuel Injected!
    Join Date
    Dec 2017

    Square to flat IAC plug

    What’s the wiring difference between the square plug to the flat plug on the IAC. I have an adapter but I do think its wrong as it goes to fully retract when I start it....
    Also are all the flat style Iac motor the same on the 7.4 TBI???

  2. #2
    Fuel Injected! PJG1173's Avatar
    Join Date
    Nov 2011
    Jacksonville NC
    when switching to the flat from square two wires need to be transposed. I cant remember off the top of my head which ones.

    edit: looking at the diagrams I used for my 454 tbi upgrade, blue\white and blue\black are transposed
    Last edited by PJG1173; 03-07-2018 at 07:54 PM.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 12" spring lift, 4.56 gears, F/R lockers, 36x12.5x15 TSL's, long tube headers, 266HR cam, p&p vortec heads, $0D Marine MPFI.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

Similar Threads

  1. Back to square one...
    By damanx in forum GM EFI Systems
    Replies: 0
    Last Post: 01-06-2016, 08:56 AM
  2. Falling flat...
    By Rally Smith in forum GM EFI Systems
    Replies: 5
    Last Post: 11-10-2015, 07:36 AM
  3. Replies: 2
    Last Post: 10-22-2015, 11:15 PM
  4. Flat tappet cam and Vortec heads
    By buddrow in forum Gear Heads
    Replies: 7
    Last Post: 04-29-2015, 09:49 AM
  5. Square Bore 454 TBI Adapter
    By dave w in forum Gear Heads
    Replies: 9
    Last Post: 07-11-2013, 05:43 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts