BMW Questions? Ask a BMW Repair Expert for Answers.
what has been done so far?
what have you tried to do to correct it?
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.the problem is that the air passages in the cylinder heads are clogged and need to be cleaned out. you can try this tool http://www.agatools.com/tool/n62-secondary-air-cleaner but usually the heads need to be removed and sent to a machine shop to be cleaned out..Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.