ECM upgrade (1227730) for stock 2.8 (Page 87/107)
Darth Fiero MAR 14, 08:07 PM

quote
Originally posted by R Runner:

I'm sorry if this was covered before, but I couldn't find it.

I am making an adaptor wire interface to be able to plug in the factory Fiero wire harness with minimal modification to the Fiero. I have the Wire harness from the 7730 and the pin side of the Fiero computer ('87 GT). The I see the pin connection listed as "Pin A1 move to Pin BA11". The Fiero side pins are obvious. There are 4 banks of pins... A,B,C, and D. All of the pins are numbered. simple. The pins on the 7730 wire harness are labeled as 6 banks A,B,C,D,E, (and I presume but it is not marked) F. Which pin is "BA11"? is that the one in pin bank "A" and PIN #11? What does the "B" in front of it mean? Is that the connector (there are 3 which could correspond to B and G and Secondary wire harness)?

So in summary.... What does the "B" and the "G" for the 7730 Pin location mean?

Thank you.



The "B" in front of "BA11" stands for "Black" connector. So "BA11" means "Black Connector, pin A11". And pin "GF16" means "Green (or yellow) Connector, pin F16".
R Runner MAR 15, 12:51 PM

quote
Originally posted by Darth Fiero:


The "B" in front of "BA11" stands for "Black" connector. So "BA11" means "Black Connector, pin A11". And pin "GF16" means "Green (or yellow) Connector, pin F16".



Thank you Ryan! I was not sure if you or anyone else was checking this thread any more.

One more question..... I am using a harness out of a 91 F-body just like your Pin to Pin chart says (so I figure they should be close). While trying to make this harness, I noticed that on the F-body pig tail there was no wire for (I'm trying to remember) GF6. Should I be using the Fiero pig tail (I have a spare from the junk yard) to re-pin into the F-body connectors and then solder it to the back of the female Fiero computer input? (I have a junk one of those too ) OR, should I be using the F-body pig tail as the main wires?

Thanks for the help! I'll be needing a reprogram soon if things go well.
mtownfiero MAR 15, 07:40 PM
Is there a list of what the codes mean anywhere besdies the ones on the forum? I could swear im getting code 54 but it isnt listed here. Thanks
R Runner MAR 15, 08:12 PM

quote
Originally posted by R Runner:


Thank you Ryan! I was not sure if you or anyone else was checking this thread any more.

One more question..... I am using a harness out of a 91 F-body just like your Pin to Pin chart says (so I figure they should be close). While trying to make this harness, I noticed that on the F-body pig tail there was no wire for (I'm trying to remember) GF6. Should I be using the Fiero pig tail (I have a spare from the junk yard) to re-pin into the F-body connectors and then solder it to the back of the female Fiero computer input? (I have a junk one of those too ) OR, should I be using the F-body pig tail as the main wires?

Thanks for the help! I'll be needing a reprogram soon if things go well.



Nevermind.... I think I figured it out. I am going to use the Fiero wires so that I can match up colors. Should make it easier to trace later.
Darth Fiero MAR 16, 11:23 AM

quote
Originally posted by R Runner:


Thank you Ryan! I was not sure if you or anyone else was checking this thread any more.

One more question..... I am using a harness out of a 91 F-body just like your Pin to Pin chart says (so I figure they should be close). While trying to make this harness, I noticed that on the F-body pig tail there was no wire for (I'm trying to remember) GF6. Should I be using the Fiero pig tail (I have a spare from the junk yard) to re-pin into the F-body connectors and then solder it to the back of the female Fiero computer input? (I have a junk one of those too ) OR, should I be using the F-body pig tail as the main wires?

Thanks for the help! I'll be needing a reprogram soon if things go well.




You can remove pins/wires from the Fiero ECM connectors and insert them into the connectors you are using for the 7730 ECM as needed. If you have extra left over from the F-body harness/connectors, you can use those as well.
Darth Fiero MAR 16, 11:25 AM

quote
Originally posted by mtownfiero:

Is there a list of what the codes mean anywhere besdies the ones on the forum? I could swear im getting code 54 but it isnt listed here. Thanks



http://www.gmtuners.com/OBD1_DTC.htm

Code 54 = fuel pump voltage low. This code usually sets when the Fuel Pump relay has failed (but the engine may continue to start and run because the fuel pump in stock Fiero applications gets power via the oil pressure switch which acts as the backup circuit).
Bridgetown APR 02, 12:50 AM
Hey Guys! Don't mean to hijack but I thaught this is where everyone I am looking for would be. I am needing to enlist the help of somone familiar with doing the wiring for a 3400(LA1)/7730 swap into a fiero. This wiring is the last hurdle in my swap and I was hoping to get this thing together this summer. Thanks.
RWDPLZ APR 07, 01:52 PM
Man what an awesome thread. Too bad there's not a similar upgrade for the 2.5L

------------------

1984 Fiero SE

Darth Fiero APR 07, 04:52 PM

quote
Originally posted by RWDPLZ:

Man what an awesome thread. Too bad there's not a similar upgrade for the 2.5L




Actually there can be. The S10 pickups used the 2.5 duke with a distributor up until 1993. These used the 1227165 / 16156647 ECMs which were of the "P4" generation (same ECM was used in 1986-89 TPI V8 cars). The only problem is these ECMs use different connectors and wire terminals vs. stock Fiero; so the conversion wouldn't just involve a simple repinning of the harness. You would need to either buy the proper terminals and crimp them on or splice in wires that had the correct terminals. I have not done this conversion yet so I cannot tell you if there are any worthwhile benefits. This conversion would only work for 1984-86 Fiero 2.5's that had the distributor. 1987-88 2.5's with DIS won't be compatible with this ECM; but you wouldn't need it anyway. The ECM used in these cars was used thru 1991 in others with the same engine.

-ryan
NCTyphoonKid APR 07, 08:12 PM
Thanks for posting this thread
Korey