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      06-09-2014, 08:25 AM   #1
anom3
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I know this has been discussed a few times before, but I wonder if anyone had found a solution to this.

I have uploaded 2 videos.

I understand that a slightly noisy vanos for a second or so on cold start is normal as oil pressure needs to build up.

I am not talking about that, I am talking about the noise at 0:03 on the first video and at 0:04 on the 2nd.

Anyone have an idea of what this is?

A) ONLY happens on cold start. But even if it has sat for as little as 4 hours. Also worth mentioning, even if I "cold start" the car, wait 2 seconds, turn it off, and back on again, the noise will not happen again until next cold start (a few hours later).

B) Happens on EVERY cold start.

C) NEVER happens otherwise.

D) Car runs perfectly otherwise.

E) E92 M3, production 2007.07.

F - Update) Car has bpmsport.com tune with cold start delete enabled. So this is not related to the secondary air pump as this was happening before and after. Car also has 240E installed, previously had 50E. Noise was / is present on both.

G - Update #2) Updated a new video on post #16 of the thread ( http://www.m3post.com/forums/showpos...1&postcount=16 ) with a VERY clear sound of this grinding at 0:49.

H - Update #3) I isolated the Start -> Noise sequence using a spectrum analyzer tool for the PC. The image is attached as post #20 ( http://www.m3post.com/forums/showpos...5&postcount=20 ).

I - Update #4) *NOISE BACK, NOT THIS* Intresting development. See post #37 ( http://www.m3post.com/forums/showpos...4&postcount=37 )... Perhaps power related?!?

J - Update #5) Check valves on order, install early next week. Will report if it helps or not.

K - Update #6) Check valves changed, unfortunatly due to time, only 3 of 4 (last one gonna be done next early next week). Also, new development, engine temperature HAS an influence on if / how loud the noise is ( http://www.m3post.com/forums/showpos...7&postcount=69 ). Waiting 12+ hours as I write this update before testing if the check valves help or not.

L - Update #7) Previous "run cycle" temperature has a clear effect on the loudness of the noise. If on previous start / stop the motor / oiil doesnt warm up, the next time the noise is expected (6+ hours later), the noise is almost not there. See post video in post #84 ( http://www.m3post.com/forums/showpos...5&postcount=84 ).

M - Update #8) I was unable to determine exactly where the noise was coming from when I listened for it with the intake manifold off + my head under the hood. It *SOUNDED* like it was coming from under the drivers side valve cover area.

O - Update #9) The following were replaced: check valves and chain tensioners. The starter was pulled, cleaned and greased. The noise still persists. In my case, I can say for sure, the 3 listed are NOT responsible for the noise.

P - Update #10) Changed over to 0W40. Did not fix it, noise still there but noticeably better. 1/4 the time the noise doesnt happen, and after 20+ cold starts (a couple weeks worth at least) i have yet to hear it long and loud like numerous times before. This points me to this being somewhere within the oil system.

Latest video, intake manifold removed, recorded directly above motor (under the hood):






Last edited by anom3; 08-02-2014 at 04:21 PM.
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      06-09-2014, 08:58 AM   #2
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weird. could it be a bad starter motor? maybe when it's cold, it's not disengaging fast enough and it causes that clunking noise?
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      06-09-2014, 09:05 AM   #3
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There is quite a detailed thread talking about something similar.

http://www.m3post.com/forums/showthr...=412843&page=1

But after going thru all dozen or so pages of it... No concrete solution was found

I'm guessing it could be one of the following:

A) Like you said, late starter disengaging.
B) Something to do with lack of oil pressure after the car has been sitting for a bit (check valves?).
C) Vanos belt tensioner letting the vanos chain go slack after the car has been sitting for a bit.

Would really like to get this fixed, but dont want to start throwing arrows in the dark only to find the noise still present
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      06-09-2014, 09:06 AM   #4
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Thoughts on the issue fwiw posted elsewhere http://www.m3post.com/forums/showpos...6&postcount=14

I will say that your example sounds a bit more "advanced" than I've heard elsewhere and on my own M3s. The rattle/grind begins almost right as the motor turns over instead of on slight delay. How long has this been happening for you?

On the bright side, if everyone on the forum starts one of these threads we can establish normalcy.
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      06-09-2014, 09:09 AM   #5
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I bought the car about 2.5K km ago... Its been happening ever since I bought it

The previous owner (a close friend) has had it happening since he bought it as well.

Car has about 67K km on it.
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      06-09-2014, 09:15 AM   #6
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Malek's explanation in the link previously posted seems to me the most likely.

If you want to pursue, I'd replace the starter. But as he said, you'd be doing it only to potentially stop the noise, not because there's something wrong.

10's of thousands of miles for me as well.
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      06-09-2014, 09:23 AM   #7
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Here also > http://www.m3post.com/forums/showthread.php?t=987126
In the OP second video i can hear the clunk noise and at the same time a metallic rattle !
First time that i hear the rattle in it !
Now in my posted link someone said i tap my brakes 6-7 times and hold the brake pedal about 30 secondes,now i have done this too and the clunk is gone when i start the car !
Now my question is....what the hell has the brake to do with the clunk noise ?!?!
And the mystery about the clunk noise goes on and on and ......................damn this noise ?!?!
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      06-09-2014, 09:23 AM   #8
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I think the route I will take is have the starter replaced as well as the check valves at once.

My understanding is the check valves are "within the V", as it the starter... (correct?). As well as being very inexpensive as far as parts go.

So once they are in there changing the starter the additional cost of replacing the check valves should be next to none.

Will speak with my mechanics tomorrow and expect to be getting this done sometime next week depending on how fast the parts come in.

---

If anyone else has a possible solution please do chime in
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      06-09-2014, 09:25 AM   #9
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In about 2 hours I will head down to the underground and try tapping the break numerous times, and then holding as I start the vehicle and let you know if this happens or not.

For what its worth, mine is 6MT btw...

Quote:
Originally Posted by ///M Power-Belgium View Post
Here also > http://www.m3post.com/forums/showthread.php?t=987126
In the OP second video i can hear the clunk noise and at the same time a metallic rattle !
First time that i hear the rattle in it !
Now in my posted link someone said i tap my brakes 6-7 times and hold the brake pedal about 30 secondes,now i have done this too and the clunk is gone when i start the car !
Now my question is....what the hell has the brake to do with the clunk noise ?!?!
And the mystery about the clunk noise goes on and on and ......................damn this noise ?!?!
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      06-09-2014, 09:26 AM   #10
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Quote:
Originally Posted by anom3 View Post
In about 2 hours I will head down to the underground and try tapping the break numerous times, and then holding as I start the vehicle and let you know if this happens or not.

For what its worth, mine is 6MT btw...
Please replace only one thing at a time or else we'll never get to the bottom of this...

Both my 6MT and DCT do it. Not unique to 6MT.
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      06-09-2014, 09:54 AM   #11
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Quote:
Originally Posted by anom3 View Post
In about 2 hours I will head down to the underground and try tapping the break numerous times, and then holding as I start the vehicle and let you know if this happens or not.

For what its worth, mine is 6MT btw...
Perfect man ! Mine is DCT , and the other guy with tapping the brake has also DCT !
Please keep us posted,i realy...realy would love a solution for the clunk noise ,for the moment the only thing that works for me personal is tapping the brake pedal and i know it sounds realy unbelievable,but it works !
BTW.....like others are saying Mike (Mike-Benvo) hears it all over the world when tuning our cars(remote cable tuning) on Skype !
I know he's engine did it too,but now with the new engine he got i don't know,and i need to ask him about it !
Damn the clunk noise ?!?!
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      06-09-2014, 09:57 AM   #12
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Quote:
Originally Posted by FormulaMMM View Post
Please replace only one thing at a time or else we'll never get to the bottom of this...

Both my 6MT and DCT do it. Not unique to 6MT.
+1 ! About replace one thing at a time !
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      06-09-2014, 10:12 AM   #13
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This has been discussed so many times, it's normal.
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      06-09-2014, 02:59 PM   #14
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Doesn't "normal" imply that they all do it? Mine doesn't; never heard any strange noises following start-up in everyday use, though it can happen after an oil change. I forgot to pre-fill the oil filter and got a significant noise 2 seconds after the first start-up with fresh 10W-60 oil.
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      06-09-2014, 03:18 PM   #15
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Quote:
Originally Posted by anom3 View Post
I bought the car about 2.5K km ago... Its been happening ever since I bought it

The previous owner (a close friend) has had it happening since he bought it as well.

Car has about 67K km on it.
I posted this video now 3 times on this forum ,and so here is it again to make this clunk noise very....very clear !
Note : This is not my car and actualy it is "the loudest clunk noise" i ever heard from our S65 engine !

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      06-10-2014, 01:57 PM   #16
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I let the car sit for 2 days.

I tried the pump break 6-7 times, hold for 30 secs, same.

Here is a new video, the sounds is quite pronounced on this one (perhaps because it has sat for 2 days?).

This cannot be good

The sound is VERY obvious at 0:49.



Anyone?

Last edited by anom3; 06-10-2014 at 02:06 PM.
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      06-10-2014, 02:30 PM   #17
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Quote:
Originally Posted by anom3 View Post
I let the car sit for 2 days.

I tried the pump break 6-7 times, hold for 30 secs, same.

Here is a new video, the sounds is quite pronounced on this one (perhaps because it has sat for 2 days?).

This cannot be good

The sound is VERY obvious at 0:49.



Anyone?
Holy 5H1T man ! Tapping the brake don't works for you ?!?!
Actualy i'm realy tired of this f*cking clunk noise , but never i'll give up !
Feel sorry man even when you tapping the brake it's still there !
Damn this becomes realy unbelievable with my DCT the tapping works and with your 6MT not !
In your last video(above) i could hear the "rattle" clunk even more pronounced and worse than i ever heard ! And specific the rattle in it ! It's almost a machine gun ?!?!
BTW....the whole world can see the posted video's your's and mine and hear the clunk noise and also loud like never before and no one with a solution ???
Anyway man...." i realy appreciate" the effort for posting your video's !
Nex step for me personal is ....now it's almost 9.30 pm here so my BMW/Dealer is closed,but tomorrow i'm on the phone with them and i will say you have Email with link from me......the link of this thread !!!
And the next day the same...but with the question....what is this damn clunk noise ???
Again thank you my friend !
And hope for a solution and for all of us !!!
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Last edited by ///M Power-Belgium; 06-10-2014 at 02:38 PM.
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      06-10-2014, 05:16 PM   #18
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you should try starting the car while someone listens to the engine. they might be able to pinpoint where in the engine the noise is coming from.

Another thing you can try since you have the MT is to put the wheels on and push start the car. If you don't get the sound then it could be the starter.
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      06-10-2014, 06:37 PM   #19
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Quote:
Originally Posted by Petros View Post
you should try starting the car while someone listens to the engine. they might be able to pinpoint where in the engine the noise is coming from.

Another thing you can try since you have the MT is to put the wheels on and push start the car. If you don't get the sound then it could be the starter.
a) In regards to pinpointing the source of the noise. This is planned, will have this done at the mechanics shortly. Just kind of a head ache as I need to leave the car there over night.

b) Regarding pushing the car. Excellent idea! I will try my best to do this tomorrow and post my results here.

Thank you VERY much for the pointers!
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      06-10-2014, 06:52 PM   #20
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I come from a heavy IT background.

I ran the noise through a spectrum analyzer.

Here is what the noise "looks" like:

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      06-10-2014, 09:51 PM   #21
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Interesting OP thanks for the videos and spectrum plot.

One think I noticed is your car seems to make the noise a bit earlier than my car does. Still the same noise though.
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      06-11-2014, 09:49 AM   #22
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Quote:
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I come from a heavy IT background.

I ran the noise through a spectrum analyzer.

Here is what the noise "looks" like:

Pesonal i think when looking at your noise and clunk noise graphics through the spectrum analyzer it's not the starter ,it comes later when engine starts to run !
It is also in this way when i hear it on mine !
Note ; Like i said yesterday this thread (link of ) is now at my BMW/Dealer,last year my car was a few times there for this problem but my engine did not make the clunk noise, because it drove the car to my dealer and was warmed up !
And i'm waiting now for answers ,because they are looking into the Puma-Database...... i'm curious and let's hope !
Will post the result as soon when i receive it !
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