Sorry about that! You're talking K Jetronic for an '85 Turbo -no AMM. I scrolled the top line off the screen so I only saw the "ECU" and a "244 DL" in your sig line so I jumped to conclusions of an LH Jetronic system. The fact you were talking about a cold start injector apparently didn't register either.

I'm not much of a K Jet expert, but it sounds to me like the control pressure regulator in your fuel system isn't getting a signal. It's powered by the injector relay (aka. main or system relay) which is controlled by an impulse signal from the ignition system. That in turn requires an rpm signal from the Hall Effect sensor. The easier thing to deal with is the injector relay so maybe check it out first (try re-soldering), but for a no-start condition I'm guessing the Hall Effect sensor is your problem. There's a fair bit of information on this in the 700/900 FAQ on this site (a lot of it applies to 240's, though locations and wiring may be different).

If you're lucky, one of the real experts will confirm this diagnsosis or point you in the right direction.