Help! 2007 e92 engine whistle at idle

Veester · 09-23-2012, 06:41 PM

Hi, I've had this preowned '07 E92 for less than a month and this super high pitched sound just started happening today. It seems to go away at higher RPMs but it's pretty persistent at idle. The car just hit 50k miles and it's so loud in the engine bay I can't even lock down where it might be coming from.

I took this video right after the sound began to happen.

mlifxs · 10-06-2012, 01:26 PM

I have something like this going on, about once or twice a month. Here's my thread on the topic:
http://www.e90post.com/forums/showthread.php?t=691932

It happened today, sent me back searching. When it occurs, it makes the sound when I let off the gas or idling. Goes away when I step on the gas. If I shut the car off and restart it, it usually goes away, first try.

So far only one code thrown, but I'm not positive it's related to it. On one occurrence got code P0012.

Veester · 10-07-2012, 07:28 PM

Thanks for the reply. I took it to BMW of Dallas last week and they had it for two days but couldn't figure it out. I'll update the post if I learn anything else.

mlifxs · 10-07-2012, 07:58 PM

Quote:

Originally Posted by Veester

Thanks for the reply. I took it to BMW of Dallas last week and they had it for two days but couldn't figure it out. I'll update the post if I learn anything else.

thanks, I'll do the same.

Veester · 01-15-2013, 04:04 PM

Just heard back from my SA and he said that it was a faulty belt tensioner.

mlifxs · 01-16-2013, 10:02 AM

good to hear they figured it out. I've also had belt tensioner issues (cost 300+ to fix at dealer). Didn't make noise at idle.

Veester · 01-17-2013, 09:01 AM

Quote:

Originally Posted by Veester

Just heard back from my SA and he said that it was a faulty belt tensioner.

Got my car back yesterday and the noise is still there...

humbertob · 01-18-2013, 03:12 PM

I have heard that same noise on some E46s back then, and resulted to be a faulty belt tensioner and a bad alternator bearing, after those 2 parts have replaced the noise went off. It's so simply to know or to find out if you got either of those two faulty parts, with the engine running (idling) put some water in the belt tensioner and/or alternator bearing, if the noise goes off, without a doubt you got either a bad tensioner or a bad alternator bearing, both of them are very easy to replace yourself and they are not so expensive. Hope you find the problem soon !

evolnimi · 06-20-2013, 03:36 AM

This might be the problem:

Sparklinone · 07-21-2013, 05:52 PM

Any resolution to this problem? Mine is doing exact same thing. Does replacing the pcv valve fix this annoying problem?

09-23-2012, 06:41 PM	#1
Veester Enlisted Member 0 Rep 37 Posts Drives: 2014 328i M Sport Join Date: Sep 2012 Location: Dallas iTrader: (1)	Hi, I've had this preowned '07 E92 for less than a month and this super high pitched sound just started happening today. It seems to go away at higher RPMs but it's pretty persistent at idle. The car just hit 50k miles and it's so loud in the engine bay I can't even lock down where it might be coming from. I took this video right after the sound began to happen. Last edited by Veester; 09-23-2012 at 08:05 PM..
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10-06-2012, 01:26 PM	#2
mlifxs Diamond Geezer 212 Rep 2,385 Posts Drives: Jet Black 2007 328i Saloon Join Date: Nov 2007 Location: Florida iTrader: (6) Garage List 2016 VW Golf Sportw ... [10.00]	I have something like this going on, about once or twice a month. Here's my thread on the topic: http://www.e90post.com/forums/showthread.php?t=691932 It happened today, sent me back searching. When it occurs, it makes the sound when I let off the gas or idling. Goes away when I step on the gas. If I shut the car off and restart it, it usually goes away, first try. So far only one code thrown, but I'm not positive it's related to it. On one occurrence got code P0012.
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10-07-2012, 07:28 PM	#3
Veester Enlisted Member 0 Rep 37 Posts Drives: 2014 328i M Sport Join Date: Sep 2012 Location: Dallas iTrader: (1)	Thanks for the reply. I took it to BMW of Dallas last week and they had it for two days but couldn't figure it out. I'll update the post if I learn anything else.
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01-15-2013, 04:04 PM	#5
Veester Enlisted Member 0 Rep 37 Posts Drives: 2014 328i M Sport Join Date: Sep 2012 Location: Dallas iTrader: (1)	Just heard back from my SA and he said that it was a faulty belt tensioner.
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01-16-2013, 10:02 AM	#6
mlifxs Diamond Geezer 212 Rep 2,385 Posts Drives: Jet Black 2007 328i Saloon Join Date: Nov 2007 Location: Florida iTrader: (6) Garage List 2016 VW Golf Sportw ... [10.00]	good to hear they figured it out. I've also had belt tensioner issues (cost 300+ to fix at dealer). Didn't make noise at idle.
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01-18-2013, 03:12 PM	#8
humbertob First Lieutenant 132 Rep 318 Posts Drives: '16 BMW M235i Join Date: Jan 2013 Location: Laredo, Tx. iTrader: (0)	I have heard that same noise on some E46s back then, and resulted to be a faulty belt tensioner and a bad alternator bearing, after those 2 parts have replaced the noise went off. It's so simply to know or to find out if you got either of those two faulty parts, with the engine running (idling) put some water in the belt tensioner and/or alternator bearing, if the noise goes off, without a doubt you got either a bad tensioner or a bad alternator bearing, both of them are very easy to replace yourself and they are not so expensive. Hope you find the problem soon !
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06-20-2013, 03:36 AM	#9
evolnimi Registered 2 Rep 4 Posts Drives: 2008 E92 Join Date: Apr 2012 Location: Los Angeles iTrader: (0)	This might be the problem: Last edited by evolnimi; 06-20-2013 at 03:43 AM..
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07-21-2013, 05:52 PM	#10
Sparklinone Registered 0 Rep 3 Posts Drives: BMW 328i Join Date: Jul 2013 Location: Dallas tx iTrader: (0)	Any resolution to this problem? Mine is doing exact same thing. Does replacing the pcv valve fix this annoying problem?
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