ECM upgrade (1227730) for stock 2.8 (Page 90/107)
Darth Fiero MAY 12, 06:45 PM

quote
Originally posted by dbmgmt:

Thanks for your quick response, Ryan. You can tell by the number of pages in this thread that this is a hot topic. You've done a great job with it.

My 87 GT is stock so it looks like if I take the plunge and get a 7730 that I will have to get the chip reprogrammed. I'm assummimg your shop can do that! If that's so, when I take the plunge, I'll be in contact.

Thanks for all your attention and help,
Marty





no prob; let me know...
R Runner MAY 17, 08:49 PM
Ryan,

I finally got all of it in. I installed the 7730 ('92 F-body) and the Digital EGR in a "stock" '87 GT. I'll put the Digital cruise in next. The car seems to be running okay, but I think it is still learning. I took it for a 100 mile trip and just near the end of the trip I had a code 32 set. I am assuming that this is the EGR as is was with the Fiero computer. Everything worked fine for nearly 100 miles then a problem. Thoughts? Everything appears to be hooked up correctly. There is a small chance that there is a leak in the tube between the EGR nd the intake. I have a new one on the way just in case.

Thank you.
Darth Fiero MAY 17, 11:04 PM

quote
Originally posted by R Runner:

Ryan,

I finally got all of it in. I installed the 7730 ('92 F-body) and the Digital EGR in a "stock" '87 GT. I'll put the Digital cruise in next. The car seems to be running okay, but I think it is still learning. I took it for a 100 mile trip and just near the end of the trip I had a code 32 set. I am assuming that this is the EGR as is was with the Fiero computer. Everything worked fine for nearly 100 miles then a problem. Thoughts? Everything appears to be hooked up correctly. There is a small chance that there is a leak in the tube between the EGR nd the intake. I have a new one on the way just in case.

Thank you.



Yes, the code 32 is for the EGR on the 7730 ECM as well. However, the conditions for setting the EGR codes with the Digital EGR Valve are different than stock Fiero. The 7730 ECM runs a check on the EGR valve while you decelerate from a highway speed. It opens each of the EGR ports during this check and looks to see if manifold vacuum changes. If the EGR is functioning normally, the ECM should see the manifold vacuum decrease slightly during deceleration any time one or more of the EGR ports is commanded open. If you have a leak in the EGR tube, this may prevent the manifold vacuum from changing as the ECM predicts it should, and thus the code 32 will set. If you suspect such a leak, it would be a good idea to find and fix that issue. Of course it is also possible you have one or more ports on your EGR valve that are obstructed or not flowing as they should. Furthermore, when using the digital EGR valve, you do NOT need to use the EGR tube gasket that has the restrictor hole in it (as is needed with the stock Fiero EGR system). If you are using this gasket, it COULD interfere with this diagnostic check.

-ryan
R Runner MAY 18, 05:05 AM

quote
Originally posted by Darth Fiero:


Yes, the code 32 is for the EGR on the 7730 ECM as well. However, the conditions for setting the EGR codes with the Digital EGR Valve are different than stock Fiero. The 7730 ECM runs a check on the EGR valve while you decelerate from a highway speed. It opens each of the EGR ports during this check and looks to see if manifold vacuum changes. If the EGR is functioning normally, the ECM should see the manifold vacuum decrease slightly during deceleration any time one or more of the EGR ports is commanded open. If you have a leak in the EGR tube, this may prevent the manifold vacuum from changing as the ECM predicts it should, and thus the code 32 will set. If you suspect such a leak, it would be a good idea to find and fix that issue. Of course it is also possible you have one or more ports on your EGR valve that are obstructed or not flowing as they should. Furthermore, when using the digital EGR valve, you do NOT need to use the EGR tube gasket that has the restrictor hole in it (as is needed with the stock Fiero EGR system). If you are using this gasket, it COULD interfere with this diagnostic check.

-ryan



Thank you Ryan. I did clean out the ports before I installed it however the other issues could be true. I plan on installing the braided EGR tube from The Fiero Store and I will make sure that I open up the gasket to eliminate flow restriction.

One more quick question. I printed off a copy of your cruise control wiring connections for my digital cruise installation. I understand what to do with each of the 9 wires in the back but what is:
.
"Brake Lamp Input N.O. G WHT Connect to → ? Terminal "30" of the Relay"
.
Also, are the 10 wires on the cruise module (in the engine bay) the only rewiring required? No wiring changes to the module near the drivers feet?

Thanks again!

Paul
Darth Fiero MAY 18, 02:11 PM

quote
Originally posted by R Runner:


Thank you Ryan. I did clean out the ports before I installed it however the other issues could be true. I plan on installing the braided EGR tube from The Fiero Store and I will make sure that I open up the gasket to eliminate flow restriction.

One more quick question. I printed off a copy of your cruise control wiring connections for my digital cruise installation. I understand what to do with each of the 9 wires in the back but what is:
.
"Brake Lamp Input N.O. G WHT Connect to → ? Terminal "30" of the Relay"



You will need to obtain and wire up a 12v relay as the instructions describe. This relay provides the second brake switch input signal to the cruise module using the existing brake signal that goes to the OE Fiero cruise system.


quote

.
Also, are the 10 wires on the cruise module (in the engine bay) the only rewiring required? No wiring changes to the module near the drivers feet?

Thanks again!

Paul



The instructions should explain that you will need to splice some wires together at the OE Fiero cruise module (by the driver's feet) and remove the Fiero module after you are done. If you don't have instructions that explain this, let me know via email (sp1@gmtuners.com) and I'll make sure you get the correct instructions sent to you.

-ryan
R Runner MAY 18, 05:56 PM

quote
Originally posted by Darth Fiero:


The instructions should explain that you will need to splice some wires together at the OE Fiero cruise module (by the driver's feet) and remove the Fiero module after you are done. If you don't have instructions that explain this, let me know via email (sp1@gmtuners.com) and I'll make sure you get the correct instructions sent to you.

-ryan



Thank you again Ryan. I am an idiot. I get it now. Piece of cake.
ALLTRBO JUN 04, 04:37 PM
I just read through this whole thread again/now... very expensive (I took a day off to get this stuff figured out in a hurry).

Anyway, I'm not going to use a 3.4pr as I mentioned earlier in the thread, but I'm still going to use the '730, now with a DIS V6. It would be great if someone could verify this for me...
Can use the DIS conversion pinout (92 Beretta 3.1) to run $8F (TGP) code with no other ECU wiring changes?

[This message has been edited by ALLTRBO (edited 06-04-2009).]

mswenson289 JUN 26, 02:15 PM
What motor? If planning on a 2.8 conversion to DIS you will need to make arrangements for a crank postion sessor.
Mike
ALLTRBO JUN 26, 09:37 PM
No worries there, it's a TGP 3.1 (Gen II) with a Gen III top end.
I just need my question's answer verified, for now I'm assuming (vaguely from what I've read) that this will work.
mtownfiero JUL 26, 12:39 AM
For anyone thats done this ecm swap with DIS what have you done to get your a/c working? Im thinking of trying to adapt a cavalier compressor since thats what my motor is from.