[Diy_efi] ECM question

[WEG1192 at aol.com]

In a message dated 1/27/03 1:52:34 PM Eastern Standard Time, 
billmiranda at netscape.net writes:

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

That would be correct.

>  
>  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 incorrect. The 1991 Corvette had the 1227727 ECM, not the 1227165. 
1989 was the last year for the 1227165 in any TPI V8. Its not even close to 
being the same ECM so you can't swap PROMs period.

>  
>  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?

The year is always on the PROM. If they are going to fail you on emissions 
due to the date of your PROM, they are just nit picking. If the ECM matches 
the engine year (1989) then the system will work fine as a 1989 system if you 
have all the emissions devices connected. If the emissions folks insist that 
your engine be newer than 1991 or equal, then you are either screwed or you 
have a lot of work ahead of you to convert the harness and all the other 
systems over to 1991 specs.

JW


>  
>  That ultimately is my question.
>  
>  William Miranda

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