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F10 / F11 (2011 - Current)
The new chapter in the highly successful story of the BMW 5 Series Sedan (F10) and wagon (F11)

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  #1  
Old 03-27-2013, 05:10 PM
ifnd323 ifnd323 is offline
infd323
Location: Chapel Hill, NC
 
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Mein Auto: 2011 550xi
uhh ooh - 550xi drivetrain grinding

Fellow x-drive owners - anyone experienced this?

I have a 2011 550xi with about 22K miles on it. About 2K miles ago the drivetrain started making popping and a loud grinding/chattering noise when I am making left hand turns under relatively heavy acceleration (picture spirited driving). The noise is clearly coming from the front of the car; well infront of the driver and passenger sear. It won't do it in right hand turns.

The dealer has replaced the center drive shaft, the left front drive shaft and the noise continues. They are in the process of replacing the right front drive shaft. However, the SA just called me and said they took another identical 550xi out and tested it and said it makes the same noise and it is normal for the car. There is no way this is normal in my opinion. I think it is the differential, but the dealer is insiting it isn't.

Car is still completely stock, but I am wanting to add Dinan Stage 2 and springs. Don't want to make any changes until this is resolved.

Has anyone else experienced this in an x-drive? Any suggestions on what I do next? This just can't be right.
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Last edited by ifnd323; 03-27-2013 at 08:55 PM.
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  #2  
Old 03-27-2013, 05:28 PM
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rmorin49 rmorin49 is online now
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Sorry to hear about the issue with your 550. How are things in Chapel Hill? I spent the best years of my life there. I hope you get this resolved. Is your dealer then one on US15 N towards Durham?
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  #3  
Old 03-27-2013, 05:38 PM
ifnd323 ifnd323 is offline
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Location: Chapel Hill, NC
 
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Quote:
Originally Posted by rmorin49 View Post
Is your dealer then one on US15 N towards Durham?
Yep. That's the one.
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  #4  
Old 03-27-2013, 05:46 PM
Quacker Quacker is offline
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Make him take you for a ride in the other one that they claim is "normal."
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  #5  
Old 03-29-2013, 06:11 AM
ifnd323 ifnd323 is offline
infd323
Location: Chapel Hill, NC
 
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Hi All -

Mr. Dunderhi has been assisting with trouble shooting my issue. Unfortunately, we're stummped. Anyone else seen the below behavior or have any idea of what this could be?

Quote:
Originally Posted by dunderhi
Quote:
Originally Posted by ifnd323
Quote:
Originally Posted by dunderhi
Quote:
Originally Posted by ifnd323
Mr. Dunderhi,

Been a big fan of reading your posts and appreciate your reponses to the few threads I've posted.

I'm really at a loss with my dealer's response to this issue I'm having.

http://www.bimmerfest.com/forums/sho...d.php?t=685713

What would you recommed as next steps?
Thanks. I actually started to research your problem last night, but Mrs D put me to work (big weekend coming up) and I didn't get back to it. I know there were a couple a complaints in the past about xDrives and noise, but I didn't find your particulater issue. I had two quick thoughts, but I wanted to look into it a bit more. So I'll just take a shot. 1) Find an open parking lot and try to repeat the manuever in reverse to see if you have the same problem. I assume you won't be able to acheive similiar speeds, but it would be interesting to know if it still happens. 2) Check the insides of your tires/wheel wells for rubbing. 2.5) Check the inside of your wheel spokes to see if there is a line gouged from the brake hitting it. (It's a long shot, since BMW wheels normally have lots of clearance) 3) Take it to another dealer. Okay that was 3.5 items, but I'm just shooting from the hip without researching your problem.

It'll be at the dealer until Monday, they are replacing the right front axle right now. I can't believe they would call me and tell me its normal while they are in the process of replacing another part to see if will make it go away.

1. Hadn't thought of this. Will try it.
2. Will look, but the sound is metal on metal chatter. The shop foreman rode with me last week and commented that the shudder/vibration and noise was so subtantial that it felt like an engine mount might be broken and the engine may be bouncing around.
2.5 will check
3. Will do but what a pain in the a$$ for a $80K car
4. It will do it in all modes, but seems easier to make it happen when not in normal (DTC or traction control disabled). Seems like when the front left wheel is able to break traction is when it happens and the car is trying to send power to the other wheels and the diff/some gear in the drive train can't handle the power and the gears pop over each other.

Really miffed that BMW would try to tell me it's not an issue now that 2 mechanics and the SA all agreed there was an issue previously.

Could you be bit more specific about the conditions to get your left front wheel to slip. I had Dinan and couldn't any slippage from the front tires. Are you at the turn-lock?

Potentially unrelated, but in hill-decent mode under slippery conditions my GL450 made a horrific grinding noise which I was told was normal if tires were slipping.

ifnd323 reply:

Related to the wheel slip, I am not talking about spinning the wheels/smoking the tires. Here are three examples of what I am talking about***********:
1. When cornering hard left and under heavy acceleration at moderate speed (30-45 mph), and the suspension is fully loaded on the right side of the car (and presumably somewhat to the rear) and right at the edge of having the car slide a little bit; it feels like the left front is losing traction and the car can't put full power down on the front left. When I can typically really feel it is when I am in a turn like this an the road is somewhat uneven, the left front not having any substantial spring load on it, "bounces" over the bumps. At the point of the "bump" it you will hear a "pop" or a "clank" vs. the grinding noise. The first time I heard it I thought a piece of the suspension failed. It sounds like the noise is being make by one or two gear cogs jumping over each other.
2. When at low speed (standing stop, or <15 mph) and turning left (think enterning a 45-55 MPH main road from a side street at a stop sign) and there is loose debris/small gravel on the road - the car can't put all the power down without some slippage. This is when it makes the grinding sound. Sounds like many gear cogs bouncing over each other, intermittently catching each other, then grinding/bouncing over each other until you let up on the acceleration.
3. There are a set of railroad tracks by my house that the asphalt around them is sloped in a gentle ramp to be flush with the top of the tracks. The tracks are on a small straight away in the middle of some twisties out in the country - great fun. When you hit the small ramp at pretty good speed (maybe 60 mph) I sometimes get a little air. Not like Dukes of Hazzard air, one or more of the wheels probably is off the ground an 1/8th to a 1/4 of an inch. When that happens you often get the "pop" or maybe a 1/2 second of grinding noise - this is in a relatively straight line.

I'm not at turn lock when I'm turning left. However, in example #2 type situations the car is more prone to make the noise and it seems to be more severe the farther left I have turned the wheel.

Does this give you any thoughts?
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Last edited by ifnd323; 03-29-2013 at 06:45 PM.
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  #6  
Old 03-29-2013, 08:51 AM
Kcustom Kcustom is offline
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could it be a bad CV joint?
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  #7  
Old 03-29-2013, 01:57 PM
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dunderhi dunderhi is online now
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I tried your case number 2 today, but my rear tires broke free kicking up gravel, so I had to abort to perserve my paint job. I need to find a spot with less gravel.
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  #8  
Old 03-29-2013, 06:35 PM
Munich77 Munich77 is offline
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Quote:
Originally Posted by dunderhi View Post
I tried your case number 2 today, but my rear tires broke free kicking up gravel, so I had to abort to perserve my paint job. I need to find a spot with less gravel.
LOL - might be hard to find that in the DC area... Your "old" BBS rims look awesome on the 6 series coupe.
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  #9  
Old 03-29-2013, 06:49 PM
ifnd323 ifnd323 is offline
infd323
Location: Chapel Hill, NC
 
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Quote:
Originally Posted by dunderhi View Post
I tried your case number 2 today, but my rear tires broke free kicking up gravel, so I had to abort to perserve my paint job. I need to find a spot with less gravel.
We don't need two cars damaged. The sand left over on auxillery roads from winter sanding works well and is less hazardous to paint than gravel.

Thanks Mr. Dunderhi appreciate you helping to troubleshoot.
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  #10  
Old 03-29-2013, 07:08 PM
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dunderhi dunderhi is online now
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Originally Posted by Munich77 View Post
LOL - might be hard to find that in the DC area... Your "old" BBS rims look awesome on the 6 series coupe.
Thanks, some folks said they looked "old" when they were new.

Now you know the "real" reason that I didn't get an SL550 or an M6, I wanted to reuse my RGRs.
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  #11  
Old 03-29-2013, 07:21 PM
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dunderhi dunderhi is online now
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Quote:
Originally Posted by ifnd323 View Post
We don't need two cars damaged. The sand left over on auxillery roads from winter sanding works well and is less hazardous to paint than gravel.

Thanks Mr. Dunderhi appreciate you helping to troubleshoot.
No problem. I've been feeling out how the 6er handles under different conditions, so it's a lesson learned. I don't have any documented evidence, but it seems the xDrive on my 650 has a stronger rear bias than my 550.
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  #12  
Old 04-02-2013, 12:31 PM
bmguy bmguy is offline
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Not sure if this helps solve or steer you with your issues; but I have my car currently in the shop and it was making noise from the front suspension area - when I took it in they couldn't duplicate the issue - but there was a measures bulletin out to replace the tension struts for exactly the noise I was describing - it was colder out and it would make a grinding like noise but only when the car was in a gentle suspension bounce often with wheels turned it was worse (the high and gentle sloped speed bumps are what pressured mine to make noise)

They say the part is updated, and it sounds recently - Mine is having that work done, along with a bunch of other issues so I will not have it back for at least a week to test it.

I dont read your issues the same as what I was experiencing but thought maybe this would at least be helpful to you in your quest for your solution.

I have a 2012 550xi btw
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  #13  
Old 04-11-2013, 11:46 AM
ifnd323 ifnd323 is offline
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Location: Chapel Hill, NC
 
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After the 5th repair attempt, the dealer has now located a broken engine mount. How do you break an engine mount?
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  #14  
Old 04-11-2013, 01:48 PM
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ausdude ausdude is offline
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Quote:
Originally Posted by ifnd323 View Post
After the 5th repair attempt, the dealer has now located a broken engine mount. How do you break an engine mount?
My former MB engine mount was leaking and had to be replaced. Are these similar mounts?
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  #15  
Old 05-23-2013, 02:53 PM
dbs600 dbs600 is offline
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Any updates on this?
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  #16  
Old 05-26-2013, 06:10 PM
ifnd323 ifnd323 is offline
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Location: Chapel Hill, NC
 
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Yeah. Engine mount was replaced and all is fine now. Apparently the torque and turning left caused the engine to vibrate on the mount. Pain it took so long to diagnose though
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