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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
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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
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Phil325i Phil325i is offline
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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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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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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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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
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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
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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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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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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
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CALWATERBOY DUE CALWATERBOY DUE is offline
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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 offline
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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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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
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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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  #14  
Old 02-16-2015, 08:49 AM
Zakov Zakov is offline
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My noise was caused by worn belt tensioner. Fixed long time ago
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  #15  
Old 02-16-2015, 04:03 PM
aleks001 aleks001 is offline
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Originally Posted by Zakov View Post
My noise was caused by worn belt tensioner. Fixed long time ago
You know this is what I suspected as well. I bought a new one and noise reduced but didn't fully go away. I have a feeling the new one was slightly faulty as well. It will be getting replaced in about 2 years until the rattle is very rare and I can't hear it with the windows up so meh, I'm not throwing any more money at this car :P
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  #16  
Old 04-24-2016, 02:40 AM
aleks001 aleks001 is offline
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I have finally found the source of this rattle after 4 years of ownership. I checked everything 50 times by now and could never isolate the low rpm rattle, but it has finally all made sense. To describe the symptoms again it would mainly happen when at low rpm and you would accelerate a littler harder but without dropping a gear, so basically when the engine would vibrate the most.

Ofcourse like most of my issues it was due to the amazing build quality of BMW, some of you may have seen may rants in the past. I will 100% never buy another one.

And the issue was. Drum roll ........

BROKEN HEAD OF A BOLT IN THE OIL PAN.

Thank you Aluminium bolts, I have lost count of the amount that have broken. I found it while doing the oil pan gasket, I wasn't really surprised to see it in there considering how many others have broken around the engine that were never touched.

The good news is, that there is no chance your oil pump can suck the bolt up into your engine because there is a strainer/filter before the oil goes up.

Anyway though I would come back and update this for future people who search this thread, I hate it when I find unfinished threads when I'm googling away for solutions for my German built machine lol
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  #17  
Old 04-24-2016, 04:55 AM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Quote:
Originally Posted by aleks001 View Post
And the issue was. Drum roll ........

BROKEN HEAD OF A BOLT IN THE OIL PAN.

Thank you Aluminium bolts, I have lost count of the amount that have broken. I found it while doing the oil pan gasket, I wasn't really surprised to see it in there considering how many others have broken around the engine that were never touched.

The good news is, that there is no chance your oil pump can suck the bolt up into your engine because there is a strainer/filter before the oil goes up.

WHOA! Where'd it come from, inside resting on bottom of oil pan? Pics??
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  #18  
Old 04-24-2016, 02:50 PM
aleks001 aleks001 is offline
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Quote:
Originally Posted by CALWATERBOY DUE View Post
WHOA! Where'd it come from, inside resting on bottom of oil pan? Pics??
Hi cal, I'm not really sure where it came from i had a look when the pan was off and couldn't see any missing bolts at the top. It could have came from anywhere, there are a lot of bolts under the cover.

And yes just at the bottom of the pan im assuming its been floating around the pan when it had oil in it. It was a small e12 hex bolt with a blue head. Sorry no pictures.
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  #19  
Old 04-25-2016, 05:08 AM
motoguy128 motoguy128 is offline
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Broken Aluminum bolts are often the fault of the person operating the torque wrench.... or no using a torque wrench. Many of them call for some sort of loc-tite and fairly low torque settings. If you tighten them like a steel bolt... bad news. Besides, they are in a aluminum costing, so unless you have a LOT of threads, you can;t get as much torque on them. A bolt can quickly become a drill.
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  #20  
Old 04-25-2016, 03:43 PM
aleks001 aleks001 is offline
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Quote:
Originally Posted by motoguy128 View Post
Broken Aluminum bolts are often the fault of the person operating the torque wrench.... or no using a torque wrench. Many of them call for some sort of loc-tite and fairly low torque settings. If you tighten them like a steel bolt... bad news. Besides, they are in a aluminum costing, so unless you have a LOT of threads, you can;t get as much torque on them. A bolt can quickly become a drill.
The oil pan has never been off nor the valve cover until I got to them so that only can mean two things.
1. The factory over torqued the bolts
2. BMW used cheap quality bolts.

Either way it says a lot about BMW.
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  #21  
Old 04-25-2016, 08:43 PM
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Oulixes Oulixes is offline
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The factory over torqued the bolts...

Where was your engine built?
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  #22  
Old 04-25-2016, 08:51 PM
aleks001 aleks001 is offline
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Quote:
Originally Posted by Oulixes View Post
The factory over torqued the bolts...

Where was your engine built?
I believe all/most e90's in Australia come from the ROSSLYN plant in South Africa.
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  #23  
Old 06-21-2016, 02:07 AM
aleks001 aleks001 is offline
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It was not the broken bolt in the pan, that turned out to be wishful thinking.

Although I think I might be getting closer. I now believe it is the engine mount heat shield. It literally sits on the engine mount to protect it from the exhaust. I hammered it a little from the top the other day as an experiment and it seems to have reduced the rattle considerably.

So my next step will be to remove it and go for a drive, it will take me a couple of weeks to get to this. But if this turns out to be it I will be very happy and I hope this thread helps others as this noise has been driving me crazy for 4 years. I've pretty much given up on it but then I had an idea and now I'm hoping it will come true.

Will update soon, stay tuned
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  #24  
Old 06-21-2016, 06:45 AM
fdriller9 fdriller9 is offline
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If the bolt was in the pan, it did not come from the top end.

I would check the rod end bearings and make sure those bolts are all still present. That could be the source the of the sound. I'm pretty sure it's an E12 head last I took apart one of these engines. Though I'm also pretty sure they are steel bolts. Might be an oil pump bolt as those are aluminum.

Also my car had a bit of play in the timing chain and it slapped around idle. Try replacing the chain tensioner, not belt tensioner.
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Last edited by fdriller9; 06-21-2016 at 06:55 AM.
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  #25  
Old 06-21-2016, 02:42 PM
aleks001 aleks001 is offline
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Quote:
Originally Posted by fdriller9 View Post
If the bolt was in the pan, it did not come from the top end.

I would check the rod end bearings and make sure those bolts are all still present. That could be the source the of the sound. I'm pretty sure it's an E12 head last I took apart one of these engines. Though I'm also pretty sure they are steel bolts. Might be an oil pump bolt as those are aluminum.

Also my car had a bit of play in the timing chain and it slapped around idle. Try replacing the chain tensioner, not belt tensioner.
Its most likely from the bottom but i couldnt fins it when i did the oil pan and im not going back i dont think its the chain tensioner, when i did the valve cover the chain was in perfect condition and nice and tight also my sound is very marble in a can i would describe all you tube chain slapp videos usually have a deaper sound. Plus i can only replicate the sound while accelerating when i n park i can rev the car all i like and cant reproduce it so thats why im pretty sure its more a rattle thats created from engine vibrations. But we will see
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