3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
Looks like by the 27% that the dme is trying to add fuel to compensate for a lean mixture, if it was negative it would be trying to take it away. More than likely you have a vacuum leak. I would check the black intake boot, both sections are know for splitting but the more common one is the one that connects to the throttle and idle valve, it usually rips at the little elbow that goes to the idle valve, if you can't see it reach your hand in there to the backside of that elbow and you will probably be able to put your finger right in there.
Once you get the cylinder head make sure you bring it to a machine shop and get it pressure tested and checked for cracks, there is nothing worse than putting a head gasket on and finding out that the head is warped or cracked.......trust me.
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