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My 2007 z4m was at the dealer for almost 2 weeks for the same problem... I have the last update but, after changing the MAS, it did not fix the problem. The software is up to date. They told me they know when its colder the melange do not have enough gaz (air is denser). They cannot do anything other than suggest me to give some gaz on before starting the car....BM do not expect to make a new software update as the car is not sold anymore. They also told me they looked at the spark plug and, i could change them. They have seen sometimes it fix the problem . Mine is 36000 km.
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