Car smells not good in the morning. BMW E53 3.0i.

[aollaku]

Hi folks,

I have a BMW E53 3.0i, Auto, build date 22.12.2003 (facelift version). In the morning when I start the car it smells a bit from the pipe. It has some oil leak from oil sump and valve cover but is too cold to say that it smells from the heat of intake manifold or other hot components. Anyway, the smell came from the exhaust pipe so should be something internal. I`ve changed lambda sensor, spark plug, the boot from to air intake, water pump, valve cover once etc. Also, I`ve scanned my car with odb2 (Carly and other odb2 scanner tools) there is no check engine light or error stored or generated into the memory. Please, can you help me with this issue? How can I diagnose what is wrong with my car?

Best,

Andi