There are a few things effected by heat that could be causing this. Crankshaft position sensor (if your car is equipped since Mercedes started using them sometime around 1991-1992), Fuel pump relay, fuel pump itself, ignition coil (s) and ignition control module (EZL). The only way to narrow down which one it is, is to diagnose the problem WHILE its not starting, so test for fuel and spark during those times and narrow it back from there.
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SOURCE: 2002 c240, my engine will start then die,wont restart for 30 mins
need more inform if you hear the startor turn over the engine when the car wont start
SOURCE: I have a 1995 mercedes
I think its the fuel filter been clogged and needs to replaced.I had same issue before and change it and runs perfect again.
SOURCE: i have a 1999 e320 that runs fine when its cool
Sounds like the same problem I had about 2 years ago in my 00 e320 cdi. The car was cutting out after about 10 mins in traffic and would only start again when cooled down. I couldnt tell you what sensor it was but it was only a simple sensor and I would be a 100% that it was the same problem.
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