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      04-06-2011, 03:49 AM   #1
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Post M3 Noises (What's Normal/Not Normal)

I was thinking it would be cool to have a thread that defined all the noises of the m3 and what is actually happening.

Starting off with when you first start the car there is typically the loud noise that resembles an exhaust leak/old school v8. I believe I read this is the Secondary Air Injection leaning out the cats to heat them up quicker.

There is another noise that typically happens within the first couple minutes that sounds like it's coming from the front driver's side fender. It's almost sounds like a power mirror motor but is only on for about 5 seconds, what is this?

Also, when I came home today after sitting in horrid traffic I parked and shut off the car and it ran for a while. Definitely sounds different from the amp fan in my 335 and you can't hear it as well from inside the trunk as you can right in the wheel well. Sounds like some type of motor/pump. Anyone know?

If you know of a noise and what it is (or if you don't) post here!
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      04-06-2011, 05:27 AM   #2
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Brakes squeak with first stop of the day. AC drain drips onto the engine and sizzle once arriving at my destination and turning the car off.
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      04-06-2011, 05:34 AM   #3
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Don't forget the Differential "grinding" and heat shields when the car cools down
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      04-06-2011, 05:35 AM   #4
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The 5 second sound that you hear from the left mirror side a minute after you turn the car on is completely normal and our best guess was calibrations.
There is also normal clunking shifting while stopped (DCT) especially when you arrive to your quite garage and shift into N.
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      04-06-2011, 07:06 AM   #5
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The cow bell noise when pebbles get stuck in the rear wheel brake shield.

The transmission clunking sound at low speeds (6MT too).
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      04-06-2011, 07:14 AM   #6
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Some sort of intoxicating sound coming from the front, sounds better as I get on the throttle
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      04-06-2011, 10:54 AM   #7
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All interior rattles. Yes, unfortunately, they're normal on the M3. I just hit 18,000 miles and now i have the nav rattle...
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      04-06-2011, 11:00 AM   #8
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Interior rattling on the passenger door/ glove compartment side.. No idea what it is. I get the other noises mentioned as well but they all seem to be normal noises
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      04-06-2011, 12:41 PM   #9
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Quote:
Originally Posted by klammer View Post
Some sort of intoxicating sound coming from the front, sounds better as I get on the throttle
Lmfao!!!!!!!!!!!!
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      04-06-2011, 12:43 PM   #10
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nothing rattle on mine and im at 37k

i had a rattle way back cause of my cruise control botton but for some reason it just gone...
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      04-06-2011, 01:58 PM   #11
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The throw-out bearing (6MT) sounds like a hovering helicopter when clutch is engaged in neutral. Not as loud as a helicopter, but that kind of sound. You can also hear the throw-out bearing occasionally when cruising/coasting.

I don't have any rattles.

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      04-06-2011, 02:02 PM   #12
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Quote:
Originally Posted by brava09 View Post
The cow bell noise when pebbles get stuck in the rear wheel brake shield.

The transmission clunking sound at low speeds (6MT too).
these
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      04-06-2011, 03:05 PM   #13
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Amazing how my 6yr old E46 M3 still has no interior rattles. I have yet to come across another E46 M3 who has interior rattles. Mine is a DD over the worst bumpy roads of Batlimore...
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      04-06-2011, 04:06 PM   #14
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Quote:
Originally Posted by checkmate View Post
Amazing how my 6yr old E46 M3 still has no interior rattles. I have yet to come across another E46 M3 who has interior rattles. Mine is a DD over the worst bumpy roads of Batlimore...
No offense but the faster the car get, the more rattle you hear.
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      04-06-2011, 04:11 PM   #15
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      04-06-2011, 04:28 PM   #16
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Quote:
Originally Posted by SchnellM3 View Post
Don't forget the Differential "grinding" and heat shields when the car cools down
Care to elaborate on the Grinding noise? Can you feel it in the gas pedal? Is it under hard acceleration in first gear?

Biggest question of all, is it NORMAL?

Otherwise I have all the same shit. My car rattles like a tin can, but that may be because of my exhaust and subwoofer. I think that people dont know what rattles are, because I havent owned a car ever that didnt have some kind of rattle at some point...

D
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      04-06-2011, 04:40 PM   #17
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Quote:
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No offense but the faster the car get, the more rattle you hear.
that explains why the 335i rattles more than an M3
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      04-06-2011, 05:21 PM   #18
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^^^ Yes yes, but thats a different type of fast. Its looses to the M3 so fast it rattles in its shoes! hehe
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      04-06-2011, 07:09 PM   #19
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Quote:
Originally Posted by Nine View Post
that explains why the 335i rattles more than an M3
This would be better described as a violent shaking from the motor shutting down on the freeway as you dodge cars trying to get to the shoulder because your hpfp has gone out again
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      04-06-2011, 10:07 PM   #20
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Quote:
Originally Posted by lve2xlr8 View Post
This would be better described as a violent shaking from the motor shutting down on the freeway as you dodge cars trying to get to the shoulder because your hpfp has gone out again
Lol...agreed.
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      04-06-2011, 10:26 PM   #21
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Exhaust leak-type sound? Check.

DCT clunk when shifting into N after a routine drive? Check.

Rear shelf rattle? Check.

Whine when decelerating in gear from about 3k rpms? Check.


Does the exhaust-leak type sound ever go away? I've heard that after about 20 minutes of driving before. Waiting for the cats to warm up doesn't seem to explain that...
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      04-06-2011, 11:01 PM   #22
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Quote:
Originally Posted by RichMattB View Post
Exhaust leak-type sound? Check.

DCT clunk when shifting into N after a routine drive? Check.

Rear shelf rattle? Check.

Whine when decelerating in gear from about 3k rpms? Check.


Does the exhaust-leak type sound ever go away? I've heard that after about 20 minutes of driving before. Waiting for the cats to warm up doesn't seem to explain that...
I can hear what sounds like a small exhaust leak when at lower rpms with heavy throttle if I'm next to a curb or wall. Normal? Not sure. Have I accepted it? Yes.

Also, do you guys routinely shift to neutral before you shut the car off? It's not necessary. When you shut it off (if the key's not in the ignition) it will go to P automatically regardless if you're in D1 R N or 1.
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