engine won't fire

[zoomar]

OK, I'm new to CLOD and may just be a fool...
..but I'm trying out CEM and can't start my engine. So far, I've tried both the spit and hurri. I've set both magnetos on, opened the fuel cocks, set the proper prop pitch, and set the mixture to full. Throttlewise, I've tried everything from 10% to 100%. I push "I", the ignition pops, the prop turns over several times and then dies. I've tried repeating things but no go. I've tried using the clickable cockpit controls and mapped keys in various combinations. The little CEM scales on the lower quadrant of my screen show that my inputs are working. What gives? I read the thread about Binky's problems, but this sounds different. Engine works fine when CEM not selected. HELP!