John

You have exactly described the symptoms common to many of us.

Many comments are available if you search.

I have found that you can improve the running of the engine via adjusting the EHA (do a search) and by good maintenance and tune but not solve the warm start & die & start.

The owners manual almost tells you to use throttle when starting a warm engine which I find interesting. That is for a new car.

I have tried Injector Cleaner but strongly suspect the injectors are leaking down after shut-off especially as the engine actually gets hotter before cooling.

So other than getting used to using a bit of throttle when warm changing injectors is the only thing left unknown for me.

They can be done DIY and are not too expensive on the M103. Best to know everything else is as it should be first.

Duke - that was a great explanation on the idling.

Oreo - as far as I know you cannot adjust the idle speed on the M103.

89 300CE
152k kms