January 14, 2008on my lastest mod...changing out the 5.0 tb to a 454 tb, ported to 2 1/8... I have stubbled on a change over problem....the IAC and TPS sensors are pluged different.and gm pigtails come with only WHITE wires...I need to know , with the locking clip facing you, and the pins facing away.....in what order are the colors on both plugs......any help will be appreciated
Forums : Silverado (c/k) (1988 - 1998) : 454 TBI ... Tech Help Please (281 Views)
January 15, 2008there got to be a couple of tech guro's out there somewhere
January 15, 2008my truck with the big block is buried in the snow, i will try to get the colors off of them after work if someone else doesn't chime in on it
January 17, 2008he is still outside shoveling.... anybody else
January 17, 2008gimme a bit i'll try to dig up a wiring diagram for yea
January 17, 2008Your IAC will be the back connector the TPS will be the front one. Do you need the specific wire color?
January 17, 2008yes ....there are four wires on the IAC...there are 3 wires on the TPS...what are the exact order of the colors.....
....thanks for your help
January 17, 2008The IAC is Blue/White, Blue/Black, Green/Black, Green/White. I don't know weather it starts blue/white from the front than goes in that oreder toward the back or blue/white starts in the back and comes forward. But they are in that order.
TPS is Dark Blue, Black, Grey. But once again I don't know weather the blue one is in the front then goes to back or the blue starts in the back on comes foward.
Good luck, Mark
January 17, 2008well boys ....we are half way home....we know the order of the wires ...we know what the colors are....now we need some of or big block buddys to run out and check when the get a chance....thanks again mark for stepping up...
January 17, 2008So I take it that you are going to hardwire it because the connectors won't plug into each other? I'm sorry but I find it obvious that if you have one lead of wires with 4 and another with 3 then you just gotta match sides. Please correct me if i'm wrong.
January 17, 2008i didnt get the snow off but i did have a picture of my tbi on this computer that i blew it up to see the tps wiring
the bb tps has from rear to front, gray,blue/white stripe,black
ok the iac is
top to bottom, clip facing you
blue with black stripe
blue with white stripe
green with white stripe
green with black stripe