[Shotimes] SHO cranking but not starting

[Koper Jim]

My '92 SHO is exhibiting a no-start behavior. I went to start it the other
day and it didn't quite catch after I released the ignition key. It was a
solid crank. "No big deal", I thought, "I'll try again." The second time I
tried it I heard an electric whirring sound, similar to when a starter is
bench tested. I figured the armature gear was not engaging the flywheel. The
starter was 4 years old (Ford reman), so I yanked it and put an Advanced
Auto Parts reman starter on the car. SAME WHIRRING SOUND occurred, so the
starter does not appear to be the weak link.

A few observations:

When the starter is whirring, I noticed the serpentine belt was turning,
though slower than what I'd think a normal crank would produce.

The engine does not catch now, but does turn.

Complete 60K done in summer 02 (10K miles ago). Timing belt, camshaft sensor
and crankshaft sensor replaced at that time.

New plugs and wires recently.

Until this happened, it always cranked solidly.

Any ideas? Would the DIS be bad? Ignition switch on its way out? Fuel
injection concerns? I want to pull the timing belt cover to verify the belts
OK.

Thanks in advance!

Jim Koper