Most All Of The Wire Colors Match Perfectly, But There Are Several That Don't. My Next Plan Is To Plug The Harness Back Into The Engine And Check All The Harness EndS And Colors Myself. Thanks for Being SuchAn Awesome Forum!

There is probably some differences from harnesses from different cars and years.. Screw the colors, just worry about matching the correct pins.

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86 Fiero GT 4spd - L67 swap: VS cam, GenV
98 GTP - Some mods

Yea, match the pins and trace the wires. Don't depend on colors.

quote Originally posted by lou_dias: Yea, match the pins and trace the wires. Don't depend on colors.

Agreed.

Even the Factory Service Manuals have typos in them, so the most important thing is where the wire is terminated on each end.

Doesn't Capitalizing Every Word Get Tiring? I Had To Backspace A Couple Of Times Typing This Because My Brain Won't Do It Consistently...

Not all harnesses used the same colors.

Black or Red/Black for the IAT ground
Black or Orange/Black for the MAP ground
Pink or Pink/Black for the switched +12
Tan or Tan/White and Purple or Purple/White for the O2 sensor leads
Purple or Purple/White for one of the VSS leads

It's how GM made them.

Something else to note is GM sometimes used different pins on the same PCM for the same end job in different applications. Example: There are several sensor ground and 5 volt reference pins PCMs commonly used in different applications (GM added extras into the PCM hardware - more than were needed for any one application). Not every application uses the same ground and 5v reference pins. These ground and 5 volt reference outputs generally do not change with different programming so they can be used in any application as you see fit.

But as a general rule - if you follow my wiring instructions to the letter, everything should work fine.

-ryan

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OVERKILL IS UNDERRATED

Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com

[This message has been edited by Darth Fiero (edited 10-18-2013).]

I'm having similar issues with my 87 GT 5 speed. I've posted a new thread, drop over and take a look.