W202 C250TD OM605 perfect cold start, hard hot start

[Mpwdhc]

Hi guys,

I have a C250 which starts perfectly when cold, and always runs well once running, but cranks excessively when warmed up. It’s a late car with the electronic key. Sometimes it will crank out, but then start instantly on the second crank. Other times it will start near to the end of the timed self crank.

The fuel pipe orings were replaced, as were the sealing orings on the IP nozzles. The problem started soon after.

Could it be the crank angle sensor or would that prevent it from starting at all?

Thank you

 

[mioba]

Leak somewhere

 

[Mpwdhc]

Hi mioba, I agree that seems likely but it’s perfect when cold, and when it recently sat for 6 months it started instantly. All the orings were done (other than shut off valve I suppose) and there is no diesel leak nor diesel smell. But the fact it started instantly after 6 months does make me question the air theory.