Just finished installing a G2 chip adapter into a 1227747 ECM for my 88 S10 to replace the 1228062 ECM.
Installed the original memcal chip from the 1228062 - programmed the 27FS512 chip with a starter bin from Dave at old school EFI.
Now even with key on engine off the CEL blinks rapidly non stop. Motor runs but poorly and the CEL constantly blinks rapidly.
I removed the chip to check continuity of all solder connections - all connections good with none shorted together or open circuits.
1227747 came from Junkyard - could it be bad?