Start
I don't even hold the key in the start position... I just turn it and release and the computer starts the car.

it is located under the hood/passenger side . near the engine firewall .
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On the first start, engine will die one second or less after starting, but it does start and run before sputtering out. On the second try everything is perfect and then on for the rest of the day. He always lets the car start itself, just turning the key to start for an instant.
This started happening just before the car was due for its 100.000 mile service. The service was done at an MB dealer, everything was changed (spark plugs, fuel & air filter, oil, trans, differential, HVAC filter, coolant, etc.) But the problem is still present. He only uses premium gasoline, and there is no indication of what could be causing this.
My thoughts were the fuel pressure regulator, maybe letting the pressure bleed out overnight. I doubt it is the fuel pump since there is no noise and the car runs perfectly otherwise.



