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      11-28-2012, 03:59 PM   #33
Jeff@TopGearSolutions
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Drives: C6 Z06, 09 335i, 10 335xi
Join Date: Dec 2008
Location: www.TopGearSolutions.com

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Quote:
Originally Posted by Pankakez & BMWs View Post
I think Jeff may have it. But I have never experienced this till today actually. So I can't say I agree that the sound is normal. It does go away if I blip the throttle and reoccurs when the RPMs get back down to ~600.
Yes, that is normal. That is the fuel pressure release valve. The HPFP pushes a lot of pressure that is excessive at idle.
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