I have a 87 300e and it ildes fine when you first start and it's cold, but when its hot and you stop and leave for ten or twenty minutes and try to start it again it starts kind of hard and seems to miss for a few seconds some times it dies. I have replaced cap rotor spark wires spark plugs fuel filter and over charge relay.

Hi Dave
I have seen fuel pump check valve failed to
holding fuel pressure cause engine hard to
start when hot.
Just replace it,You can find that in partsshop.
Good luck to you.

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MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner

I have this hard start problem too on 1989 300E. If this isnt a pro only repair can anyone describe how to change fuel check valve described above?

Thanks for replies.

The only other thing I have seen is the fuel injectors leaking down and the EHA leaking down. The EHA will visibly leak fuel if bad.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

If it is the fuel injector leaking, you should see black smoke out of the tail pipe with gasoline smell after the car is finally started.

David