ECM upgrade (1227730) for stock 2.8 (Page 89/107)
americasfuture2k APR 13, 06:33 PM
well if thats the case, then it must be my crank sensor. ive verified that there is power. the crank sensor wires are fine. i have a replacement crank sensor that i just need to install. we will see where that takes me.

EDIT: woot, i own page ...... 23!

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First LX9 Fiero GT, 1987 | My Fiero Fuel Economy | MPG Display for OBD I
Youtube Videos of My GT | 87 GT Inside Test Run | 3500 Fiero GT Test Run 01
3500 Fiero GT Test Run 02 | 3500 Fiero GT Test Run 03 | 3500 Fiero GT Test Run 04
If you can't fix it with a hammer, you've got an electrical problem
Fiero's are people too. We pay just as much attention to them, if not more than our loved ones
screw paying those bastards. im not going to become rich by paying for things.....

[This message has been edited by americasfuture2k (edited 04-13-2009).]

americasfuture2k APR 14, 10:43 PM
replacing the crank sensor made it fire right up! but that cheapo sensor didnt last too long. drove about a half mile and it died at 711. didnt see any movement in the tach. so im guessing that cheapo crank sensor blew out. im going to by a AC Delco one tomarrow. i sure hope that was the issue this time. im almost positive it is.

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First LX9 Fiero GT, 1987 | My Fiero Fuel Economy | MPG Display for OBD I
Youtube Videos of My GT | 87 GT Inside Test Run | 3500 Fiero GT Test Run 01
3500 Fiero GT Test Run 02 | 3500 Fiero GT Test Run 03 | 3500 Fiero GT Test Run 04
If you can't fix it with a hammer, you've got an electrical problem
Fiero's are people too. We pay just as much attention to them, if not more than our loved ones
screw paying those bastards. im not going to become rich by paying for things.....

Brint APR 17, 04:30 PM
For what its worth to anyone, got my PROM back from Ryan today, plugged it in, hooked up the battery and turned the key. Started up right away and evened out to a nice smooth idle. This is a mostly stock '87 .8 GT and I must say that the throtle does seem a little more responsive. I am going to check my timing (as suggested) but so far no CEL. My greatful thanks to Ryan and this great write-up. Highly suggested. This ECM should have come stock with these cars.
Brint APR 19, 02:25 PM
Okay, had the chance to drive the "87 GT with the new 7730 ECM in place for approx.50-60 miles at speeds approaching 90 MPH and CEL came on. Checked for and found code 24 which is VSS signal. I haven't had a chance to check all my wirring connections yet but I'm guessing this might have something to do with the PROM programming specifications I gave Ryan. I had him code for stock wheel and tire size (215/60R15) whereas I now have 235/45R17's on the car. Ryan, maybe you can confirm this?
Darth Fiero APR 19, 07:01 PM

quote
Originally posted by Brint:

Okay, had the chance to drive the "87 GT with the new 7730 ECM in place for approx.50-60 miles at speeds approaching 90 MPH and CEL came on. Checked for and found code 24 which is VSS signal. I haven't had a chance to check all my wirring connections yet but I'm guessing this might have something to do with the PROM programming specifications I gave Ryan. I had him code for stock wheel and tire size (215/60R15) whereas I now have 235/45R17's on the car. Ryan, maybe you can confirm this?




Tire size differences should not make the code 24 set. Code 24 usually only sets if the ECM doesn't see a Valid (reasonably accurate) speed sensor signal. Is your speedo running off the 7730 ECM (via a speedo conversion circuit), or do you simply have the ECM's VSS wires spliced into the existing VSS wiring in the Fiero?

If you have the Fiero speedo running off the 7730 ECM and the speedo is working, then you probably have either a hardware issue with the ECM or there is a problem with the programming on the chip. In any case, I would like you to verify with some scan tool data so we can see what the computer is showing for vehicle speed in relation to what your speedometer says.

If you simply have the 7730 ECM's VSS input wires spliced into the existing Fiero VSS wiring, then you should check all connections and make sure the correct Fiero VSS wires are connected to the proper terminal locations on the 7730 ECM connectors. If everything checks out, you should then hook up a scan tool to the ECM and see what it is reporting for vehicle speed and how that compares with the speedometer.

Let me know what you find.

-ryan
Brint APR 20, 12:07 PM
Obviously I wasn't as careful of my rewirring as I thought I was. Ryan, it turns out I had the purple and yellow VSS wires which belong in BB9 and BB10 in positions BB3 and BB4 at the ECU connector. Thanks again for your help. Can I getcha a beer?
americasfuture2k APR 22, 01:11 PM
this guy deserves an open bar. great man. and some hooters ladies

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First LX9 Fiero GT, 1987 | My Fiero Fuel Economy | MPG Display for OBD I
Youtube Videos of My GT | 87 GT Inside Test Run | 3500 Fiero GT Test Run 01
3500 Fiero GT Test Run 02 | 3500 Fiero GT Test Run 03 | 3500 Fiero GT Test Run 04
If you can't fix it with a hammer, you've got an electrical problem
Fiero's are people too. We pay just as much attention to them, if not more than our loved ones
screw paying those bastards. im not going to become rich by paying for things.....

dbmgmt MAY 11, 12:02 PM
After looking through all the comments for this post (which by the way was very interesting but very time consumming), I'm still a little confused about reprogramming. If I get a 7730 from a 1990-1992 F-body car with a stock chip that had a 3.1L V6 and make the necessaty wiring changes as described in the thread, do I still need to reprogram the chip, if I put it in an 87 GT?

If I do have to reprogram, where do I get it done and how much would it cost?

Thanks for all your help. It's a great thread!
Marty

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1987 GT Owner
1984 Honda XL350R Owner
Love 'em both

Darth Fiero MAY 12, 12:53 AM

quote
Originally posted by dbmgmt:

After looking through all the comments for this post (which by the way was very interesting but very time consumming), I'm still a little confused about reprogramming. If I get a 7730 from a 1990-1992 F-body car with a stock chip that had a 3.1L V6 and make the necessaty wiring changes as described in the thread, do I still need to reprogram the chip, if I put it in an 87 GT?

If I do have to reprogram, where do I get it done and how much would it cost?

Thanks for all your help. It's a great thread!
Marty




Hey Marty, the short answer to your question is YES, you will still need to get the Camaro/Firebird 3.1 chip reprogrammed to work in the Fiero application. If to do nothing more than disable the VATS (pass-key) security all F-bodies of that era had. Theoretically, if you had a 3.1 with the same size injectors and same specs as the 90-92 F-body 3.1, then the rest of the chip programming could be left stock. Although you may need to do something about the A/C pressure switch/input in order to make the fan output this ECM provides to function correctly.

Basically it is just better to have the chip from this ECM reprogrammed for your specific application so you know everything will work correctly.


-ryan
dbmgmt MAY 12, 01:01 PM
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

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=============================
1987 GT Owner
1984 Honda XL350R Owner
Love 'em both