Part Number / Help

[Guenther,Max]

Try searching the archives with vats as a subject word.  There is a post
on a 91 iroc L98(730 ECM), but then again that may not help.  According
to the post I have the vats disable is at 0016 and is changed from 10 to
00, but then you must redo the checksum at 0008 or put in the
experimental value of AA(which disables the checksum, not a good idea?)
I priced a memcal for a 90 vette and found one for $50 from some GM
dealer on the internet:
mem-cal $49.75(ARFP)
BILL BANKS
please call with your order
800-536-5346
913-782-1728
I have yet to try this out, though I have checked the locations in the
prom and they match.
Good luck,
Max
>----------
>From: 	Andrew K. Mattei[SMTP:amattei at mindspring.com]
>Reply To: 	gmecm at efi332.eng.ohio-state.edu
>Sent: 	Tuesday, April 13, 1999 7:12 PM
>To: 	gmecm at efi332.eng.ohio-state.edu
>Subject: 	Part Number / Help
>
>Hopefully someone here can help me help someone else out...
>
>A guy emailed me, and we've been exchanging mail over the last few
>days... - he's having trouble with his VATS module, and I presented two
>options to him - the 555 approach, or the reprogram the EPROM approach.
>Turns out he has no EPROM to reprogram (he just bought the car, non
>running, and the MEMCAL was not in there, but the computer was... go
>figure). 
>
>My theory is that a reprogrammed MEMCAL is better - no additional
>hardware to break, or wire in.
>
>He priced a new EPROM (MEMCAL?) at his dealer for $85, part number
>16161123. He's got a 1991 Camaro RS, 5.0L TBI, 5-speed, with A/C, ECM
>part number 1228746. However, we don't know if this MEMCAL is without
>VATS. Does GM produce a VATS-free MEMCAL for this car/ECM (and if so,
>anyone have a part number ;^D)? If not, would anyone be willing to help
>me with the hex address of the VATS enable bit? (I've been through the
>archives on this, and came up dry... would just need to disable the
>checksum and disable the VATS)...
>
>Any ideas would be very greatly appreciated, both by myself (learning
>experience!) and the guy I'm trying to help!
>
>-Andrew
>