GM ECU model/part numbers

[Shannen Durphey]

Gwyn Reedy wrote:
> 
> The EPROM has ACHA and 0143 as well as DELCO overprinted. 
This is from a 1987 Firebird/Camaro, 305, 4bbl carburetor, 700R4
trans, 2.77 or 2.73 rear gear ratio.  
The ecm # that you have is correct for the Eprom and for the 87
carbureted engine.
>These markings are
> much bolder than what I suspect is the EPROM manufacturer's ID which is:519k
> 8644 6065 06630 CE1090N.
> 
> There is a metal shield over the 40 pin chip next to the EPROM (is that the
> memcal?) which has a bar code/number on it: 645036102431046
The memcal is found in 1986 and newer tuned port fi ecm's.  It is
usually a blue covered "holder" which contains an Eprom and smaller
chips for the knock senso and back up fuel logic.  There might be
better info in the FAQ.  http://www.diy-efi.org/gmecm/faq/
> 
> If anyone can help me identify this I'd appreciate it. If not will visit
> local GM dealer and hope they can help.
I think we've got it pretty well covered. : )
Shannen
> 
> Gwyn Reedy
> Brandon, Florida
> mailto:mgr at mgrcorp.com
> 
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Shannen Durphey
> Sent: Tuesday, September 12, 2000 8:22 PM
> To: diy_efi at diy-efi.org
> Subject: Re: GM ECU model/part numbers
> 
> There are a couple of things that might help.  1)  is there a prom or
> memcal inside?  Read off the 4 letters/4 numbers that are on the
> silver sticker.  Someone here can look that up.  2)  Does the ecm have
> a socket for a prom or for a memcal?  3) call GM parts department,
> give them your number. That # isn't anything I recognize.
> Shannen
> 
> Gwyn Reedy wrote:
> >
> > Where do you find the number of the ECU (such as 747)?  I picked up a TPI
> > setup and the ECU says remanufactured by GM. There is a Service Number on
> a
> > tape on the outside of the case but no other numbers I can find. The
> number
> > on it is 01270879 but that doesn't match the commonly mentioned TPI ecus.
> > There are magic markings on the case that say 86 Firebird 305 TPI,  but I
> > don't see that kind of service number as an ECU in any list I can find.
> >
> > So how do I figure out what I've got?
> >
> > Gwyn Reedy
> > Brandon, Florida
> > mailto:mgr at mgrcorp.com
> >
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