Arrrrgh! It may not have been the LC-1 after all. Oh well.
Went out to start the Saab on Monday (-5F) and it cranked slowly then started. I noticed it was running rough. Had too many things to do on Monday, so I dealt with it running rough for about an hour and a half in city traffic. My guess was I killed another VND5N07s. Plugs 2 and 3 were black - rich. Scope showed a pulse on 2 and 3, but no flyback pulse. Indeed, bad injector drivers. Pulled the ECU away from the car and was going to probe to see if it was a output device or maybe a fet driver. No start? No power to the ECU? Checked and no signal ground (took hours to finally figure this out I mean, come on, it was the OEM harness and has been running fine for over 10 years like this). Power ground, check, just no signal ground. My signal ground is in the OEM harness?!? No cuts, no abrasions, no splices by me but still no signal ground. Ran a new signal ground, 16 ga to the head, and bam! back in business (8 hours later). In this Diagram
I suspect corrosion at J56 off of pin 5 on the OEM ECU. This junction is buried in the harness somewhere. Pin 17 is the power ground which shows 0.3 ohm or about what my meter leads read. I had a similar junction problem on the 02 Saab 9^5 which was throwing an O2 sensor code. On the 9^5, I cut it out and soldered, heat shrinked the joint and all better.
How it relates to this thread: The LC-1 was using this ground for its signal ground, too. I was using the power ground on the LC-1 (blue wire) connected to the same power ground the same as the injectors and AIC but using the white and green wires on the signal ground. It must have corrosion at a junction it shows in the wiring diagram. There are no cuts or abrasions on the harness. Shows open, now after I moved it, but must have been something greater than the 0.3 ohm I get on the power ground which would be a reason it calibrated but then un-calibrated. Regardless, the Spartan 2 is on the way and I'll be running that in the Saab anyway. I'll replace the caps on the LC-1, as I have it apart, and see if it will work on my '62 Buick.