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if you had leaky injectors (which I have had twice) you would get long starts when cold due to all the fuel sitting in the cylinder flooding it.
It is an easy diagnosis, just pull the spark plugs after the car has sat overnight. The cylinder with the leaky injector will have a wet plug that smells of fuel. The others will be dry and clean.
Bad design on BMW's part with these piezo fuel injectors. My 2007 335i has had 12 now. 6 done under warranty by Uncle BMW, and 6 I had to do. That is crazy. But keeping my fingers crossed, after so much trouble, it has been smooth sailing for the last couple of years, got 128,000 miles now. Hope to get many more years from it.
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