[Diy_efi] ECM question

[billmiranda at netscape.net]

In a message dated 1/24/03 2:27:51 PM Eastern Standard Time, 
billmiranda at netscape.net writes:
> I have a 1989 L98 (TPI) from an IROC-Z and was wondering if the PROM or > ECU from the 1991 Corvette L98 would work in this thing?
Your question is too vague. What ECM do you have? And where did you get the 1991 PROM?

JW


I believe (wihout having it here in front of me) that I have the 1227165 ECU.

The 1991 corvette switched BACK to this ECM in 1991 but I am told that it's a MAP system... although... if it's the same ECM, can I NOT take my PROM from the 1989 IROC and stick it in the 1991 ECM?

This is my reasoning for this:

I have a 1991 Landcruiser with a 1989 IROC-Z 5.7 TPI engine (mildly modded out).

If for any reason (emissions?) they connect up to the ECM, they'll read a 1989 engine.  There's a company that can take my ecm, and program it to read as a '91 but I want to see if I can do this myself.  When plugging into the ECM,.. is the year read from the ECM, or the PROM?

That ultimately is my question.

William Miranda

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