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| ECM upgrade (1227730) for stock 2.8 (Page 44/107) |
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Darth Fiero
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DEC 24, 06:32 PM
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| quote | Originally posted by megafreakindeth:
so a 7727 and 7730 are the same thing/different case? i was at the jy confused as hell cause i couldnt find a 7730. all the cars wth the right egr were 7727s. can i go and grab a 7727 with no problems? |
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Yes the 7727 and 7730 are virtually the same computer. But the difference is in the case and in the computer connectors. The 7727 has a sealed case and uses different connectors and wiring terminals that are sealed against the weather so it can be mounted in the engine compartment.
PROBLEM: The stock Fiero 2.8 harness computer wiring terminals are NOT compatible with the 7727 ECM. So if you wanted to use your stock Fiero wiring harness with the 7727 ECM, you would need to cut off the wiring terminals on your harness and either get the correct terminals and crimp them on or splice in wires that have the correct wiring terminals already. Either way will require a significant amount of work. It's better just to use a 7730 ECM. If you are having trouble finding a used 7730 ECM, try: http://www.car-part.com and search for an ENGINE COMPUTER out of a 1988-93 Chevy Beretta car equipped with the 2.8 or 3.1 V6 engine.
| quote | Originally posted by Hudini:
From what I've read it seems the two ECM's work the same but have slightly different pinouts. The 7727 has 4 connectors and the 7730 has 3 connectors. Anyone know where to find the 7727 pinout diagram?
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Yes, you can download the pinouts from my website. The 7727 was used in 1988-92 GM W-body cars (Lumina, Grand Prix, Regal, Cutlass Supreme) equipped with the 2.8 or 3.1 V6 engine.
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Darth Fiero
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DEC 24, 06:34 PM
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Just a quick bump to wish everyone a MERRY CHRISTMAS!
-ryan
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Mister
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DEC 24, 08:07 PM
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megafreakindeth
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DEC 26, 01:30 PM
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ah well if its really different then never mind. i figured having a weather sealed one would actually be better since it would hopefully be made stronger and more durable. as for repinning the ecm to work, with the 7730 i can just pull out the pins in my ecm connector and put em into the 7730 connectors? i was anticipating just cutting and soldering the whole thing but that would be a whole lot better.
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Darth Fiero
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DEC 26, 03:26 PM
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| quote | Originally posted by megafreakindeth:
. as for repinning the ecm to work, with the 7730 i can just pull out the pins in my ecm connector and put em into the 7730 connectors? |
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yes
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Blacktree
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DEC 26, 09:18 PM
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| quote | | megafreakindeth said: as for repinning the ecm to work, with the 7730 i can just pull out the pins in my ecm connector and put em into the 7730 connectors? |
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I posted this on page 9, but I'll dredge it up again:
Re-pinning the ECM connectors is simple and easy, but is time consuming. You can remove the pins from the housings using a sewing needle or a paperclip. Then, using Darth's instructions, insert the pins into the appropriate spots in the 7730 ECM connectors.
Also, in case anyone was wondering, my stalling issue was no fault of the ECM. The throttle body had some slack, so it didn't always close completely. The inconsistent TPS readings at idle were confusing the ECM.
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ohio86se
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DEC 27, 07:49 AM
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| quote | Originally posted by Mister:
Merry X-mas to all and thanks again to the guys making this swap possible:
Darth Fiero, ohio86se and Gwain.
New year resolution...New(er) ECM... 
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Merry be-lated Christmas. Have a Happy and SAFE New Year!!------------------
" DRIVE IT LIKE YOU LOVE IT"
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Darth Fiero
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DEC 30, 12:41 AM
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The revised EGR adapter plate showed up today. A test fit using parts I had here revealed the corrections made to the design of this unit was what it needed. Everybody should be good to go with the revised EGR adapter plates. In case I forgot to mention it, you will need to remove the factory Fiero 2.8 EGR mounting studs, clean out the threads in the crossover pipe (M8 x 1.25 metric thread) and use new allen-head metric cap bolts with this adapter so the heads of the bolts clear the digital EGR as shown below...
Now that we got that solved, something has come up that I think is worth mentioning in this thread. I have been contacted by a few people who say they are confused with the wiring terminal designations used on some 7730 ECMs. The confusion stems from the fact that on some wiring diagrams a terminal may be referred to as "A11" but on others it is referred to as "BA11". First let me assure everyone that all 7730 ECMs are the same. GM just changed the designations for PIN ID's for these ECMs starting in the 90's.
To break this new terminal designation down for everyone; lets use the example: "BA10"...
1st letter (B) = connector color
2nd letter (A) = "A" side of the connector (A and B are usually used to describe 24 pin connectors; C, D, E, and F are usually used to describe 32 pin connectors)
3rd number (10) = position of the terminal in that side of the connector.
To give some examples: BA3 refers to the 24pin black connector, terminal A3. BC2 refers to the 32pin black connector, terminal C2. When you see something like GE4, then that refers to the 32pin green connector, terminal E4. Or if you see YF3, then that refers to the 32 pin yellow connector, terminal F3. The 7730 accepts both YELLOW and GREEN connectors.
Hopefully this explaination clears up some of the confusion.
-ryan
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Mister
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DEC 30, 11:39 AM
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| quote | Originally posted by Darth Fiero: Everybody should be good to go with the revised EGR adapter plates.
-ryan |
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Great news THANKS
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Gwain
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JAN 02, 12:34 PM
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