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03-14-2016, 02:34 PM
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#31
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1st Gear Newbie
Join Date: Feb 2016
Location: Toronto, Ontario
Posts: 21
Car: 2011 135i
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Just got off the phone with a new mechanic. He suspects it's the PCV system. Gonna check it out in a couple days.
Thoughts?
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03-14-2016, 03:36 PM
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#32
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6th Gear Member
Join Date: Feb 2009
Location: Canada
Posts: 1,404
Car: E46
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possible yes
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E46 
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03-14-2016, 03:42 PM
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#33
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1st Gear Newbie
Join Date: Feb 2016
Location: Toronto, Ontario
Posts: 21
Car: 2011 135i
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Well I'm hopeful!
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03-14-2016, 04:34 PM
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#34
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6th Gear Member
Join Date: Feb 2009
Location: Canada
Posts: 1,404
Car: E46
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One way to check would be to pull the oil filler cap while car is running, you'll find its very hard and hear the vac. and a sudden change once off. Just a easy way to see if you have a leak.
__________________
E46
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03-14-2016, 08:40 PM
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#35
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1st Gear Newbie
Join Date: Feb 2016
Location: Toronto, Ontario
Posts: 21
Car: 2011 135i
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I see. That would confirm the PCV theory?
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03-14-2016, 09:10 PM
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#36
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6th Gear Member
Join Date: Feb 2009
Location: Canada
Posts: 1,404
Car: E46
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It can help identify a issue with the breathing system, yes.
__________________
E46
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03-18-2016, 08:14 PM
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#37
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1st Gear Newbie
Join Date: Feb 2016
Location: Toronto, Ontario
Posts: 21
Car: 2011 135i
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So I went to the new guy and the second he heard it he said, there's no way you're getting rid of that. He threw around a bunch of lingo I don't understand, but seems like it's just the nature of this particular car?
If I have to give up on it, I will. Just as a last thing... I got a better recording of the sound just by revving the engine in park...
http://initek.co/135sound2.mp3
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03-18-2016, 10:49 PM
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#38
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6th Gear Member
Join Date: Jul 2004
Location: Markham
Posts: 2,572
Car: E39 M5 & 528it
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Sounds like the alternator is working hard. Not that it's abnormal.....just get a louder exhaust so you don't hear it.
__________________
E39 528i Touring - Unicorn Package (5 Spd M)
E39 M5 - for Sunny Days
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03-20-2016, 05:52 PM
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#39
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1st Gear Newbie
Join Date: Feb 2016
Location: Toronto, Ontario
Posts: 21
Car: 2011 135i
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Haha my friend suggested the same thing. Think I'm just gonna give up on it at this point. 
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01-23-2019, 01:11 AM
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#40
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1st Gear Newbie
Join Date: Jan 2019
Location: toronto
Posts: 1
Car: 2011 x3 and 2009 x5
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oh myyyy!!!! i got the same problem with my newly bought 2011 X3 3.5 twinturbo>>>makes humming noise and less power between RPM 100-2000. I am really sad caz i just bought it 2 months ago. All this started after getting brakes done and engine light came on
Any help would be greatly appreciated___please
Thanks in advance
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01-24-2019, 12:27 AM
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#41
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1st Gear Newbie
Join Date: Feb 2016
Location: Toronto, Ontario
Posts: 21
Car: 2011 135i
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Sorry to hear that. Never figured out the problem with mine! Sold it after a few months but it was fun nonetheless. Hope you figure it out.
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