Join Date: Oct 2009
Location: Pacific Northwest
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Sorry ~ this thread started with a diesel, and I overlooked that yours was gasoline powered.
In the past, I have run across cold start valve problems and temperature sensor problems (which I would kind of lean towards) but I am not versed in the BMW fuel management system. I would have to imagine the ECU enriches the fuel mixture when the engine is cold, therefore I would look at a coolant temperature sensor being out of range, or 'lazy' if you will. You said you replaced the fuel pressure regulator with the filter? I did not realize they were a combined unit... from what I have seen, they aren't.
Your comment on smelling 'oil burning' ~ is this an 'outside odor', like oil dripping on an exhaust manifold or is it an 'internal' smell of oil being burned out the tail pipe? With catalytic converters, I have seen engines that have burned tremendous amounts of oil in the combustion process, yet the tail pipe was not showing any oily residue... keeps us posted!