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how can I fix a pinging sound on a BMW E46 330 diesel?

I have a BMW E46 330diesel which runs fine ,but every now and then I detect a pinging sound when I am accelerating.What do I have to do to solve this problem?
SULEIMAN COENRAAD, March 2012
try an injecter cleaner for diesels or a clean burn this wil help the injecters work better

bob, March 2012
link Click here to see other fixes for BMW.