Hello all, need some help, my car has 213k on her and runs like a top, however just this week after running for approximately 5 minutes she shut down. Towed her to the house let it sit and then re-cranked, thought it might be the fuel filter, due to struggling to start sometimes, replaced it, started right up, only to stop again around the 5 minute mark. Live in the SW and its approx 100 degrees here, thought it might be a tempature issue, but any one have a similar issue? Thanks in advance, Carl

 

87 420SEL, starts and only runs a few seconds - Benzworld.org - Mercedes-Benz Discussion Forum

 

It was the crankshaft position sensor on mine; hope this helps you.

 

There is a brass vacuum valve under the air filter. it has a vacuum line running to it. Check this line and the seal where the vacuum line enters the valve.