Hello there,

Fellow (former) "Tampanian" here. I have the same problem with my 93 140 diesel. It's likely because the vacuum mechanism attached to the lock in the driver's door is leaking. The part is a bear to get to, but easy to fix--so much of a bear I haven't fixed it yet! The rear doors are much easier to fix; you very well may encounter the same problem there, too.

I use the excuse that the non-unlocking front door is an added security feature... Eventually I'll pay my indy to do the necessary surgery.

Damon

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1995 E300 146,000 miles "Celia"--sold
1993 300sd 131,000 miles "Konstanze"--with Mom in Tampa
1987 300sdl 225,000 miles "Frau Grau"
1980 300sd 164,000 miles "Old Yeller"--sold