The subject car is a 1990 760 Turbo with about 227k on the odo.

I posted a message about this here at the Brickboard back in January when it first started happening. Back then, the car would just randomly die, but I could usually restart it almost immediately. Then it might be days or weeks before the problem re-appeared.

Knowing how next-to-impossible it is to find an intermittent problem like this, I just put up with it. Until one day, when finally it would not start. I replaced the flywheel sensor. The original unit's wiring insulation was falling off, and it looked old enough to be OEM. After replacement, the car started up immediately, and ran fine for about a month. Then one day it died suddenly, same as before.

But this time, I was not able to restart the car almost immediately. I ended up having to wait about fifteen minutes before it would restart. It has reoccurred a couple of times since then. Because the car will restart and run for days or weeks before this recurs, it leads me to think I didn't fix the original problem after all. But because the failure mode is somewhat different -- the 15 minute wait I have to deal with now -- it causes me to think that another component waa also faulty.

I checked the FAQ and found some info here about the ignition power stage amplifier:

http://www.brickboard.com/FAQ/700-900/ElectricalIgnition.htm#IgnitionAmplifer

This sounds a lot like it might be the culprit. However, none of the examples shown duplicate the symptoms my car is showing. So, I thought I'd post this message to ask brickboarders if you might have experienced something similar to what I am?

Incidentaly, I checked the condition of the ignition amplifier, and it appears to be fine visually. Tight, uncorroded screws holding it in place, and the electrical connection shows no evidence of corrosion or even light oxidation either. So, if it is the amplifier, the problem is internal.

Any way to test one of these before I have to shell out the bucks for a new one?

Best,
Michael