when my 190E 2.6 1991 is not used for two days or more, it starts normally but after 10-15 minutes working on iddle or driving, the engine stop and it does not start again. After a couple of hours all comes back to normal. Any suggestion ? Tks ! Renato.
Not being a mechanic, I can only relate a problem I had some years ago with a diesel motor home. Occasionally, (though not always) the engine would stop and refuse to restart unless it sat for an hour or more. There was apparently some sort of fuel shutoff mechanism that was activated by heat from the motor. Perhaps, heat is part of the cause of your problem. Maybe some electrical part that is failing?????
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