It pays to check the normal wear items first- even if they look ok....I took a gamble and paid $800.00 a week ago on a '92 190E 2.6 Sportline 5 speed that had the dreaded "when cold runs great, after 10 minutes running and warm, dies and won't restart until cool" syndrome. I had noticed the PO had spent a bunch of cash replacing virtually all the items that are typically suggested in the various MBZ and 190 forums...ignition control unit, crank pos sensor, OVP, coil and even the computer- all to no avail and had ultimately given up and just put the car up for sale as-is. The one thing I noted that hadn't been replaced (and occasionally mentioned in the forums as a culprit) was the simple cap and rotor...

Today, with another $80.00 invested in a cap and rotor plus 20 minutes of my time, it's now running perfectly...the best $800.00 car I've ever lucked into! The other clue to me was that when it was warm and wouldn't restart, it would crank in kind of a "notchy", irregular way (that it did not when it was cranking cold) and that made me think it was ignition and perhaps cap/rotor related. Hope this is helpful info...

J.G.