I had the same problem on my 4.4 m62 a while back. I couldn't figure it out which injector or injectors were leaking but I replaced them all and problem solved. Check this tread below.

http://www.xoutpost.com/bmw-sav-foru...njector-4.html

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold