Ok, Arthur, you were exactly right. Two weeks and no starting problems whatsoever. It was the OVP that was causing the problem.

This leads me, though, to a few questions:

1. The check engine light still hasn't gone away as you thought it would. When checked before, they said it was the rear cat O2 sensor. Runs perfectly now.
2. Mercedes Dealer charged me for r/r the crank sensor when they couldn't figure out what was wrong. As I mentioned earlier, that didn't help one bit. Now that I figured out what was wrong, how would you suggest I approach the dealer? I mean, I don't expect them to give me a refund necessarily, but a labor credit toward a next visit might be reasonable. $500 for the part and labor.

Thanks, P

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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles