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      03-29-2015, 08:08 AM   #1
mikusk
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Knocking noise,help identify (video)

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Hey guys,So i hear this mostly while idling,and when the clutch is pressed. I can hear it best when i move with my steering wheel.I think it might be clutch/tranny issue,not sure where it comes from exactly but when i move my camera close to gear lever it knocks louder as showon in the vid.

Please turn on speakers as much as possible its quiet :



thanks for any input !
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      03-29-2015, 10:16 AM   #2
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It sounds like it changes with idle speed and dissipates when the idle increases. It sounds like flywheel chatter but I usually only hear this when the clutch is in (pedal up).

OMG it's a rod bearing!!!!! I keed I keed .... (paranoia is in right now)
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      03-29-2015, 11:10 AM   #3
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For the moment I've no idea what the knocking noise could be...
Because the cam was inside the car !
OP.. do you hear the knocking noise also close on the front driver side wheel , when you rev it slowly to about 3K rpm ?
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      03-29-2015, 11:47 AM   #4
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if the noise diminishes when depressing the clutch, then it is most likely flywheel chatter
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      03-29-2015, 12:36 PM   #5
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i cant hear the knocking when revving the engine.
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      03-29-2015, 12:52 PM   #6
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Could be a broken flywheel tab....pressing the clutch quietens it, as does reving the engine as the flywheel loads up.
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      03-29-2015, 01:21 PM   #7
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Quote:
Originally Posted by mikusk View Post
i cant hear the knocking when revving the engine.
And outside the car ?
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      03-29-2015, 01:26 PM   #8
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Sounds like flywheel chatter. Not sure what year OPs car is, but in 08s I know they can be quite loud.
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      03-29-2015, 03:17 PM   #9
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Interesting! I JUST took my M (2008) for the first time since storage (I only put 500 miles between purchase and storage) and I noticed the knocking while sitting at idle just about 20 minutes ago. Of course, my instinct was to freak out about rod bearings, which would be insane since I'm currently 9979 miles.

Anyway, as soon as I pressed in the clutch, the noise went away...I'm guessing this is the same issue. Luckily, BMW gave me a crazy extended warranty...so, I'll be calling tomorrow!
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      03-29-2015, 05:44 PM   #10
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It is 08 guys,when I put window down and listen to engine while reving i cant hear it rly,but when iam outside of the car i can actually hear it,sometimes...its not always present thats what is the worst on it that its not consistent,during the whole video the clutch was pressed down and i was playing with steering wheel,i can hear it best while doing so.
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      03-29-2015, 05:52 PM   #11
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My '08 sounds just like that. Can't be a rod bearing b/c my last oil analysis was spot-on. The flywheel is definitely more audible than most.
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      03-29-2015, 06:58 PM   #12
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I hear the same sound from any model year 6MT, it's not limited to the 08 run.
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      03-29-2015, 08:20 PM   #13
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Okay so basically the sound is OK ? I am not supposed to worry about it ?
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      03-30-2015, 03:40 AM   #14
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The reason you can hear it best when you turn the steering wheel is that the power steering pump causes the engine speed to rise and fall and its at low rpm that the noise is most obvious. That it makes the noise with the clutch in, tends to rule out the flywheel (I thought you were pushing the clutch pedal in and out).
I think you should have the car looked at - see if any codes are being shown - just to be safe.

EDIT: I see you have had this problem before:
http://www.m3post.com/forums/showthr...hlight=exhaust

Did the shop not fix it last time?
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      03-30-2015, 05:37 AM   #15
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yes that previus issue is solved.No codes whatsoever.Yes i can hear the sound best when the clutch is pressed down but that doesnt mean i cant hear it while it is depressed,i can still hear it but not so much.
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      03-31-2015, 12:29 AM   #16
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still not sure what to do guys
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      03-31-2015, 03:10 AM   #17
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The noise is most obvious when the revs dip as you turn the steering wheel and the power steering pump draws power from the engine. The noise disappears when the ECU compensates by raising the rpms .
So it could be:
1. Normal - unlikely but possible.
2. The power steering pump is making the noise - can't imagine how.
3. Worn/broken engine mount - any knock/clunk/thump when you go from off throttle to full throttle when driving?
4. Combustion related - plug/coil/injector.
5. A function of doing the exhaust mod - not refitted correctly?
6. something else.
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      03-31-2015, 08:10 AM   #18
mikusk
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Quote:
Originally Posted by SenorFunkyPants View Post
The noise is most obvious when the revs dip as you turn the steering wheel and the power steering pump draws power from the engine. The noise disappears when the ECU compensates by raising the rpms .
So it could be:
1. Normal - unlikely but possible.
2. The power steering pump is making the noise - can't imagine how.
3. Worn/broken engine mount - any knock/clunk/thump when you go from off throttle to full throttle when driving?
4. Combustion related - plug/coil/injector.
5. A function of doing the exhaust mod - not refitted correctly?
6. something else.
1.well ppl on here are saying it is some flywheel chatter so i figured it could be normal
2-i have new pump and when i had the old one it was same
3.negative no weird noise
4.not sure,but doubt it
5.knock was the same before the mod so no
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      03-31-2015, 08:56 AM   #19
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I know that my 6MT seems loud especially when in neutral and the clutch pedal is not depressed. Is this when you are hearing the sound?

I was under the impression that the 6MT is somewhat loud and clunky (forgive my lack of technical terms or knowledge).
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      03-31-2015, 12:29 PM   #20
mikusk
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As mentioned b4,i can hear it while the clutch is or isn't pressed down,doesnt matter rly.What I am trying to say is,that i can hear the knock better when it is pressed down.
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      04-01-2015, 06:37 PM   #21
mikusk
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Okay guys,Since some of you mentined that they know the sound/have the same i will leave it as it is now.There are no fault codes showing up either.If it gets any worse,i will take it to a shop tho.
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