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Weird noise on E46 318i (N42B20)
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HangaS  
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 More options 7 Nov, 22:19
Newsgroups: alt.autos.bmw
From: HangaS <mafo...@gmail.com>
Date: Sat, 7 Nov 2009 14:19:57 -0800 (PST)
Local: Sat 7 Nov 2009 22:19
Subject: Weird noise on E46 318i (N42B20)
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Hi,

On the last couple of weeks I started noticing a strange "rattle"
sound coming from the engine bay.
The noise is can only be noticed  around 1000rpm (like when idling
when cold) and goes away in higher rpms.

Today I removed the intake cover and recorded this video..

http://www.youtube.com/watch?v=bjXqDoqOHhI

Any ideia of what is causing it? It looks like coming somewhere near
the throttle body or maybe the alternator beneath it.

Thx!


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RJD  
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 More options 9 Nov, 03:19
Newsgroups: alt.autos.bmw
From: RJD <drenn...@mindspring.com>
Date: Sun, 08 Nov 2009 21:19:55 -0600
Local: Mon 9 Nov 2009 03:19
Subject: Re: Weird noise on E46 318i (N42B20)
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An easy way to identify the culprit is to get a length of pipe from
your local hardware store (about 3-4 feet of pipe will do) and use it
like a stethoscope. Hold one end next to your ear and touch the other
end to various engine components until you find the point where it is
the loudest -- that is your suspect part.  Keep it away from the fan
blades and belts!!

Good luck.

RJD

On Sat, 7 Nov 2009 14:19:57 -0800 (PST), HangaS <mafo...@gmail.com>
wrote:


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Dave  
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 More options 9 Nov, 14:45
Newsgroups: alt.autos.bmw
From: Dave <dave.lea...@gmail.com>
Date: Mon, 9 Nov 2009 06:45:27 -0800 (PST)
Local: Mon 9 Nov 2009 14:45
Subject: Re: Weird noise on E46 318i (N42B20)
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Or you could use a long screw driver in the same way as RJD states.
Put the metal end to various components of the engine and 'listen' at
the other end.

Dunno if this car has metal heat shields but sometimes they come loose
and rattle at different RPMs.  Although this does sound like a bearing
(alternator, AC tension pulley or AC drive or water pump, power
steering).

D

On Nov 8, 10:19 pm, RJD <drenn...@mindspring.com> wrote:


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R. Mark Clayton  
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 More options 9 Nov, 18:20
Newsgroups: alt.autos.bmw
From: "R. Mark Clayton" <nospamclay...@btinternet.com>
Date: Mon, 9 Nov 2009 18:20:50 -0000
Local: Mon 9 Nov 2009 18:20
Subject: Re: Weird noise on E46 318i (N42B20)
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"Dave" <dave.lea...@gmail.com> wrote in message

news:e970aa99-a310-43df-b3fe-5b6e55f169c6@33g2000vbe.googlegroups.com...
Or you could use a long screw driver in the same way as RJD states.
Put the metal end to various components of the engine and 'listen' at
the other end.

Dunno if this car has metal heat shields but sometimes they come loose
and rattle at different RPMs.  Although this does sound like a bearing
(alternator, AC tension pulley or AC drive or water pump, power
steering).

Indeed, possibly even oil pump or main, but the latter gets bad at higher
rev's.

D

On Nov 8, 10:19 pm, RJD <drenn...@mindspring.com> wrote:


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HangaS  
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 More options 10 Nov, 00:11
Newsgroups: alt.autos.bmw
From: HangaS <mafo...@gmail.com>
Date: Mon, 9 Nov 2009 16:11:32 -0800 (PST)
Local: Tues 10 Nov 2009 00:11
Subject: Re: Weird noise on E46 318i (N42B20)
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Thank you all  for the tips.

Tomorow I'll try the 'stethoscope' technique on some suspect parts.
But if it is an isolate bearing it might not be easy to isolate the
noise with the 'stethoscope'.

I hope I find the culprit, at least just to know if it is something
that can pose a eminent danger to other parts or nor.
If it is just a bearing, i can live with that a few more day until
going to the dealer.. but I don't want a flywheel or something coming
loose
while driving.

Cheers.


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