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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 08-18-2013, 10:43 PM
aleks001 aleks001 is offline
Aleks
Location: Brisbane, Australia
 
Join Date: Nov 2011
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Mein Auto: 2006 BMW 325i
n52 low rpm engine rattle ?

I have a weird rattle from the engine bay when the car is under load. It's usually during low rpm and when the car just changes gears. It sounds like a stick is flying around the engine bay lol I changed the idler pulley and the belt tensioner on the weekend and it did greatly help with the noise, but I can still here it sometimes.

I guess the solution is just to floor it everywhere lol The only thing I can think of is something in the alternator maybe rattling around ?
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  #2  
Old 08-19-2013, 12:14 AM
Phil325i Phil325i is offline
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Mein Auto: 325i E92 Coupe
Use a piece of tubing put to your ear as a listening device to localize the source of the noise.
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  #3  
Old 08-19-2013, 02:21 AM
aleks001 aleks001 is offline
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Location: Brisbane, Australia
 
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I can't, because it only happens when I'm driving I cant replicate it while idle no matter what I do to the throttle.
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  #4  
Old 08-26-2013, 06:22 PM
Zakov Zakov is offline
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Location: Europe
 
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Mein Auto: E46 328Ci
Hello. What is this N52 engine noise in movie? Because my N52 makes very similar noise at idle


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  #5  
Old 08-26-2013, 09:59 PM
aleks001 aleks001 is offline
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Location: Brisbane, Australia
 
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Looks just like a loose cap or cover.

Mine can't be replicated at idle it only happens when driving and when the car is at it's lowest rpm after it changes gears.
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  #6  
Old 08-27-2013, 07:23 AM
Phil325i Phil325i is offline
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Surely it's misfiring isn't it? I reckon you may have a coil failed.
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  #7  
Old 08-27-2013, 06:09 PM
aleks001 aleks001 is offline
Aleks
Location: Brisbane, Australia
 
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If it misfired you would get a CEL.
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  #8  
Old 02-26-2014, 11:19 PM
aleks001 aleks001 is offline
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Location: Brisbane, Australia
 
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OMG THIS IS ACTUALLY SOLVED !!!!!!!

I cant believe this is fixed it was driving me crazy. The answer to my rattle:

BROKEN VALVE COVER BOLTS !!!!!!!

If you have a similar rattle from the engine bay, check your valve cover bolts. Just because you can see them doesn't mean they aren't broken! Get a torque wrench and try to turn each one to 9nm. You will quickly find which ones are broken.
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  #9  
Old 05-22-2014, 01:49 AM
aleks001 aleks001 is offline
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Location: Brisbane, Australia
 
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OMG THIS IS ACTUALLY NOT SOLVED lol

This came back like 2 days after posting this :P

On a random note, I've run a bottle of injector cleaner and I haven't heard the sound all week. Is this the fix ? Who knows, who even cares anymore lol This is definitely one problem I've just decided to live with especially since I never hear it with the windows up and only happens intermittently. If I don't here it for 3 months, I'll say that the injector cleaner fixed it :P
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  #10  
Old 05-22-2014, 04:07 AM
CALWATERBOY DUE's Avatar
CALWATERBOY DUE CALWATERBOY DUE is online now
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Quote:
Originally Posted by aleks001 View Post
OMG THIS IS ACTUALLY NOT SOLVED lol

This came back like 2 days after posting this :P

On a random note, I've run a bottle of injector cleaner and I haven't heard the sound all week. Is this the fix ? Who knows, who even cares anymore lol This is definitely one problem I've just decided to live with especially since I never hear it with the windows up and only happens intermittently. If I don't here it for 3 months, I'll say that the injector cleaner fixed it :P

So, now, would you guess the noise was a misfire?
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  #11  
Old 05-22-2014, 08:47 AM
fdriller9 fdriller9 is online now
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If your intake manifold has the DISA valve motors, it could be those rattling. In the US, only 330s had the 3-stage intake manifold with the DISA valves. But I'm not sure what came standard in other regions.

My outer DISA valve broke off the motor shaft and was just loosely dangling in there making a rattle. No lights because the motor itself was still operational and was sending a good signal to the DME.

Do you feel a loss in low end torque?
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  #12  
Old 05-22-2014, 03:38 PM
aleks001 aleks001 is offline
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Location: Brisbane, Australia
 
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Quote:
Originally Posted by CALWATERBOY DEU View Post
So, now, would you guess the noise was a misfire?
I highly doubt it as i assume DIS would have picked up misfires.
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  #13  
Old 05-22-2014, 03:40 PM
aleks001 aleks001 is offline
Aleks
Location: Brisbane, Australia
 
Join Date: Nov 2011
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Mein Auto: 2006 BMW 325i
Quote:
Originally Posted by fdriller9 View Post
If your intake manifold has the DISA valve motors, it could be those rattling. In the US, only 330s had the 3-stage intake manifold with the DISA valves. But I'm not sure what came standard in other regions.

My outer DISA valve broke off the motor shaft and was just loosely dangling in there making a rattle. No lights because the motor itself was still operational and was sending a good signal to the DME.

Do you feel a loss in low end torque?
I don't think it's this either, I've had a look at a couple of youtube videos of the sound the DISA valve makes when its broken and it's definitely not my sound. My sound has a metallic noise to it, like a marble in a can. And only happens at low rpm, usually just after the transmissions shifts and especially if this combination happens up hill.
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