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Originally Posted by swissfrank
Those symptoms are synonymous to a vacuum leak in the intake. A vacuum leak anywhere after the MAF sensor will cause a lean condition, of which the O2 Sensors recognize and compensate for by adding more Fuel to richen the mixture. This will max out adaption values in the computer and set fault codes.
I know the 3.0 X5's have intake boot failures, and I'm fairly certain you have the same issue with your 4.4.
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Absolutly!!!
Check the air tube going from the mass meter to the intake. If you, or anyone, has been under the hood it can get easily knocked off. Also check you vacumm lines all over the top of the engine.