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      02-03-2015, 03:43 AM   #8
djgandy
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Drives: E93 M3
Join Date: Aug 2012
Location: London

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2011 M3  [0.00]
Quote:
Originally Posted by paulmiles89 View Post
could possibly be waste gate chatter? these cars do suffer from them and its usually on startup! on the offchance you've got a jb4 you can set it so the wastegate is permenantly open or closed. set it to open and see if the noise vanishes.
Seems unlikely at idle, especially as I unplugged the vacuum lines to check. The tick is quite synchronous with the injectors so it could be then. I have had this noise on and off for 2 years now with no engine problems.

IIRC it goes away if you increase revs slightly. It does kinda sound like a pulley though and is coming from that area.
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