A cold engine starts in open loop. In open loop the ECM controls the air/fuel mixture reading input from sensors. Might be a bad MAF, coolant sensor or thermostat. Try cleaning the MAF with MAF cleaner. Spray liberally. Be sure to spray the wires that are kind of hidden. Doesn't always work but worth a try.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas