Hello ,this is my first thread i think soo since i got my 92 rs v6 3.1 mpfi this year..so the question is i know after reading a lot of FAQ with a new eeprom can be reprogram to handle a 305 or 350 tpi, since is the same number part but with different tune.

Any help will be great thanks in advance

PD Great Frum

 

Um, whats the question??

 

Yes, you can re-burn the EPROM. Just double check that it has a window first. In the later years GM started to use one-time-programmable PROMs.

The other half is that you need to ground pin 56 of the MEMCAL. This sets the ECM hardware for the proper injector firing rate for an 8 cylinder.

RBob.

 

I also am new to the TGO, I have a 1992 350 TPI w/700r4, but what is strange is that when I pulled the ECM to look at it, the numbers on it do not match what I am seeing on this site. THe ECM is labeled 16150571 and the chip in it is labeled IRQ277, Delco AUJP T350. Is this the correct ECM for this car?

 

Yes, most likely the correct ECM. The AUJP is the broadcast code (BCC) of the calibration (PROM). Which is correct for a '90 - '92 L98/auto in an f-body.

Look for the "Service Number" on the ECM's label. There are three (or so) different ECM numbers that GM used.

RBob.

 

THanks a lot, next thing that will do is find schematic about wiring of the ecm, and of course check the eeprom if it uv erasable , if not i got some at hand, i have seen that there are some eprom erase-recorder, but what about the info of the v8 data, can be found on line? im talking about the stock tune.

 

What's so special about the 7730 ECM? I've seen it mentioned and people speak highly of it. I only ask because I've have one that has been sitting around collecting dust for a couple years. I've searched, but haven't found any answers. From what I remember, it's an SD ECM, right? I'll try a new search now that it's burnning a hole in my brain again lol

 

it's the most common one from the era and can run anything from a lawn mower to a wild BBC..

Yes, it's SD.


There is an upgraded version although the number has slipped my mind, It's the same thing but with more ram. You can use it to run electronic trannies as well.

 

http://www.eecis.udel.edu/~davis/z28
http://diy-efi.org/gmecm/ecm_info/1227730/

Note that the MPFI maskID is $88, while the TPI maskID is $8D.

RBob.