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Old 10-01-2012, 11:57 AM
mbell666 mbell666 is offline
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Location: Austin, TX
 
Join Date: Jul 2012
Posts: 220
Mein Auto: e39 2002 540i6
Are you sure it is not the timing chain for the two cams? There is a chain between the two cams with a separate tensioner. I've never heard of that tensioner going but might make knock sound if tensioner failed.

Most common thing is the guide rails to fail, at a 99 car is probably in the correct mileage range for them to go. I think knocking sound is very obvious when they go. Timing chain tensioners is a don't drive situation. Test is to remove the sump pan and check for broken bits of plastic in the sump.
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