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MR,
When I have a no start problem, the first thing i check is to listen to the fuel rail for fuel sloshing showing the fuel pump is running. On the 944 you have to jumper the dme relay to check this.
If there is fuel, then I check for spark by pulling off the #1 plug wire, connecting a spare spark plug, grounding that spark plug with an alligator clip, and then cranking and looking at the plug for spark. The spark should be hot, white or blue and not yellow/orange.
This method gets me in the ballpark.
ps. I didn't know that you could diagnose pulse with a simple LED
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