Basic GM TBI injection questions.

Carl Summers InTech at writeme.com
Tue Mar 10 02:34:58 GMT 1998


Mike Dillon wrote:
> 
> I just subscribed to the group and looking for some referances on
> GM TBI injection systems. The particular one I am working with
> is from a 89 caprice with a 350 engine. The plan is to give it a new
> home under the hood of an 83 Jeep Wagoneer (The big one) with a 360
> AMC engine. I can work out all the mechanical problems without to
> much difficulty, but I would like to be able to retune the ecm's
> PROM based on learning mode base table offsets.
>  I am hoping that someone on this group can fill answer some
> basic questions about the ecm and proms.
> 1) What processor does GM use in there ecm ? I looked at my ecm and
>    all the chips were labled with Delco numbers (No help to me)
> 2) Does the PROM carry both the control software as well as the
>    calibration data ?
> 3) I see referances to 747, 730 ... is one better than the other(s) ?
>    does one have more functionality than the other(s) ?
> 4) Has someone other than a few companys broke the PROM code ?
> 
> Thanks Mike
> 
Hi Mike,
    The computer you are looking at should be a 1227747 and takes a
2732a chip....but if you used the one from the caprice it has air temp
correction the 747 has not,,,,not that it's that big a deal but air temp
correction is all about smog and yes the 747 has only lookup tables and
not very much code....but finding the fuel table shoudn't be so
difficult to modify......let me know if you need help.....and the code
isn't always in the chip................c-ya
-Carl Summers



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