Frank12

I have an ECM with the following numbers on it
DELCO ELECTRONICS DIV. G.M.C.
PROGRAM MY90 SFI- 4U
SYS NO. Ref. 16061310
MODEL NO. DKO96942 IN LIEU OF 16125111
SOFTWARE P0790AXZ01
CAL PROM 16045915 "ANHX"

would like to know more about this particular ECM for a 1990 ZR-1

It could belong to this prototype?
10Y0024 I 1990 ZR-1 VIN#101
Quaility Control/PEP car 90 LT5 engine #1

or any of these?
the ZR-1's were raced in ALMS in 90 and 91 by Morrison

Frank

Dominic Sorresso

Looks like it was the first broadcast code for the 1990 ZRs. So I suspect it's a stock calibration which was released in 89 but superceded by AUAH and then AYBK. It works w an stock 8331 ECM or any other LT-5 ECM.

http://www.tunercat.com/Docs/tnr_manual.pdf Look at pg. 65.

DRM500RUBYZR-1

Would that have been one of the ECM's that was known to have idle issues, either high or fluctuating or both?

Marty

Dominic Sorresso

AYBK would be the prom meant to address those issues. Nothing
to do w ECM.

DRM500RUBYZR-1

Good to see that I can still occasionally confuse apples and lawn chairs.
Thanks!

Marty

Dominic Sorresso

And just to be totally accurate, its not the physical prom but rather the calibration itself.