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Pete C · 03-09-2013, 01:21 PM

I agree it sounds bad. One possibility why the noise goes away is bad or gummed up timing chain tensioner. I'm pretty sure the M engine uses oil pressure for this function. If the chain stays loose and jumps a tooth it can do some expensive damage.

03-09-2013, 01:21 PM	#7
Pete C New Member 0 Rep 9 Posts Drives: '08 Z4 SI Join Date: Nov 2012 Location: Colorado iTrader: (0)	I agree it sounds bad. One possibility why the noise goes away is bad or gummed up timing chain tensioner. I'm pretty sure the M engine uses oil pressure for this function. If the chain stays loose and jumps a tooth it can do some expensive damage.
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