W-body(?) pinout for 1227727?

**EagleMark** · 07-18-2012

There's 2 pictures of the plugs in this post. one is V8 and one is V6. This was pointed out to me years ago and pictures supplied by Dave W.

http://www.gearhead-efi.com/Fuel-Inj...ull=1#post2407

**RobertISaar** · 07-18-2012

there are actually quite a few different V6(W-body) versions of the plugs.... the 88 plugs are different from the 89-90, the 89-90 are different from the 91-94.....

there may or may not be subsets between those years as well....

**JeepsAndGuns** · 07-18-2012

Interesting, I did not know that.
The plugs on all 3 of the 7727's I have, have the plugs like in the first pic in the link mark posted. Colors blue, green, white, and orange.

**dyeager535** · 07-18-2012

The pin differences must have been why they made them different colors. I had wondered that as well, even the Corvette pinout chart references two different colors for at least one of the plugs, the same year.

The most important one I verified last night that is not setup for a terminal is the fuel pump relay pin (on the Corvette pinout).

I'm hesitant to try and modify the connector as A) the plugs seem to still be available pretty easily (especially from LT1 apps) so the time/effort may not be worth it and B) the cavity is cast larger than the nose of the terminal.

There are one or two more that can't be used that I will need, but I don't have my sheet in front of me. There are TONS of pins I won't be using (TCC, EAC/EAS solenoids whatever they are, likely EGR, etc), I think I came up with about 15 terminals that ARE drilled that I don't need to use, that the connectors are designed to use. So either the mask gets changed to use those pins for whatever I need, or I find the right plugs and use the 8D mask and the vette pinout. Just like using stock pinouts if possible so I can reference them at any time for diagnosis.

**JeepsAndGuns** · 07-19-2012

Do you go to the junkyard much? If so I would look for a early 90's car with a 7727. I have pulled one from a 92 grand prix, and another from something chevy, I think it was something like a lumina or beretta, cant remember. Just grab the connectors and some of the wire from one of those.
Looks like mark might even have some connectors with a 7727 in the for sale section. Never hurts to have a spare ecm.

**RobertISaar** · 07-19-2012

7727s ONLY came from.... 88-92 W-bodies with the 2.8/3.1(possibly the 2.5) and the 90-91 L98 corvettes.

luckily, about a billion 2.8/3.1 W-bodies were made in that period.

and the connectors used were similar/identical to quite a few other applications as well, including 91-95 3.4 and 93-94 3.1(NOT 3100) W-bodies. IIRC, the LT5 and 92-93 LT1 PCM uses the same/similar connectors.