On the same subject, with a similar 260E.
Everytime I start the car after it has been sitting for more than 8-10 hours, it takes forever to finally start....at least a good 10 to 15 seconds on the starter.
This happen either in hot or cold weater, sitting in the garage or outside.
Once it finally starts, it will start right up during the day, no hesitation.
Plugs, cap/rotors were just replaced, but still the same problem.
Could it be fuel related?