Posting this to potentially solve someone else's problem . . .

Had an issue with the car not "turning off" when you turn off the key. It would continue to run for a few seconds, before finally dying when the fuel ran out. We checked the ignition, and when you turned off the key, you still had spark.

Finally found it - there is a DME relay that has a 2 second ignition delay. The process when you turn off the key, it shuts the fuel pump off, then 1.5 to 2 seconds later, it turns off the ignition. This is done to bleed down the fuel pressure in the system.

In this car, the ignition part of the relay was stuck on, but it would turn off the fuel pump (as it was supposed to)

Only took me 4 hours to find that . . . .

Hope this helps someone else . .
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For those who took the old style analogy SAT test:

Reboot:Windows :: DME Relay:Aircooled Porsche

 

??????

 

First of all, it's not a DME relay. Such "DME's" don't exist on 930's since we're not electronically fuel injected. CIS don't need no stinkin' DME.

Yeah, it's an intentional emissions thing (the ignition delay relay), but really not a bad thing in that it allows your injectors a couple seconds to bleed down the pressure, reducing the chance of fuel pooling on top of your pistons or washing your cylinder walls after you shut down (especially a concern with aged leaky injectors). Usually when those relays go ****-up they just stop doing the delay thing and your engine shuts off as if a "normal" car (i.e., instantly)

 

I referred to it as such, because that was the description on the parts tag.