Strange Sound Under Car - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 03-23-2005, 12:44 AM
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Hi!
i noticed a sound that really drives me nutz!

with radio off only (not that the sound diseappear but it's not very loud).

It's a sound that come every 2 or 3 seconds, always! It's a little "knock". Sound is still present when parked with engine on. Comes from under my feet, I can "feel" it if I have the feet on the brake pedal. If i don't have feet on pedal, i still hear it.

it's like: Toc (3 seconds) Toc (3 seconds) Toc (.....)...

That so weird??!! I get that sound when i drive, when I'm parked... sound is always on same tempo!

What's that?? ghead

Thanks
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#2 (permalink) Old 03-23-2005, 01:50 AM
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hmm not sure, does it sound like behind the dash? try turning off your climate controls to see if the sound goes away , it could be the fan .

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#3 (permalink) Old 03-23-2005, 08:14 AM
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I tried to turn off blower fan and AC compressor... sound still present
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#4 (permalink) Old 03-23-2005, 08:24 AM
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I have noticed a similar sound in mine..a few months back I had my radio off and I noticed a slight knock once every few seconds. I can't feel the knock but I can hear it. It seems to be coming from behind and below the dash. I am certain it has something to do with the climate system because occasionally when turning on the heat I get a loud knock. I wouldn't stress over it as it has zero efect on performance

Complete mod list and pics:

My 1993 325i
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#5 (permalink) Old 03-23-2005, 10:47 PM
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Yeah... but i'm the kinda guy who wants his car to be in perfect shape (specially for rattles and strange sounds lol)...

Any more ideas of what it could possibly be??

I read in another post that blower motor is "easily" accessible from engine bay... where exactly that would be? I have to lubricate it.

Thanks
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#6 (permalink) Old 03-29-2005, 09:48 AM
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Taking back this post in front of others!

No one ever had this problem fixed??
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#7 (permalink) Old 03-29-2005, 10:10 AM
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I hear the same thing in my car but I have no idea what it is.

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#8 (permalink) Old 03-29-2005, 11:45 AM
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search for engine noises in this forum (faqs) and you'll fimd a list of common noises and their common causes. Big list. It was dead on concerning my missing exhaust hangar


Crap, I think I may be a yuppie...
1998 BMW e36 M3 Sedan
2003 MINI Cooper
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#9 (permalink) Old 03-29-2005, 06:25 PM
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Thanks for the link, will be usefull when I have an annoying sound

I read it but wasn't able to find anything that looks like the sound I get...

Well, if no one has an idea of what my problem is, I'll probably drive the car to BMW mechanic next week ghead

Thanks

H.
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#10 (permalink) Old 03-29-2005, 06:57 PM
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i had the same thing happen about a week ago, so i jacked the car up to find out that one of the heat pannels that covers the exaust had rusted throughh and was just resting on the exaust. i couldn't see anything that it really protected, so i just took it off
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#11 (permalink) Old 03-30-2005, 06:08 PM
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Hmm! I'll check for this! Thanks!
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#12 (permalink) Old 03-30-2005, 06:48 PM
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well, when first reading this i first thought for you to check your abs brakes to see that they are working properly, i think i understand that you feel the toc noise through the brake pedal? Also you could maybe look up under the car and trace the lines and peices that connect to the pedal from the outside in the engine bay part maybe and you might find something there, i hear alot of people talking about noises in their bimmers, i too have the loud noise when heat is engauged, too bad they don't stay quiet, if you find the problem please post so i can check mine before it starts! hope this helps!
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#13 (permalink) Old 03-30-2005, 06:51 PM
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oh yeah, what IS the link to that list, i've searched and can't find it, or what is the title of the thread? i searched "engine noises" and "engine noise list" and it wasn't in the first few, please post the link if you can find it, thanx in advanced!
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#14 (permalink) Old 03-31-2005, 03:10 PM
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#15 (permalink) Old 04-01-2005, 11:59 AM
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