Noise from rear axle when turning at low speed....

**lecbr600** · 08-28-2017, 03:09 PM

Hi,

I am experiencing a very annoying issue in my Z3 2.0 1999.

When my car has already run an half-hour, then everything is warm, I am experiencing a very annoying noisy issue coming from rear axle. It starts when I'm turning at very low speed in first or second speed while accelerate, then requesting torque...

I don't understand whether is a differential or CV-axle issue....

For your reference I attached a video where you can hear the noise I'm talking about

Any suggestion is welcome!

https://*******/photos/naJ2nnKVEc9zpvLX8

https://*******/photos/gD2sHatW941XSrri9

****** = goo (dot) gl

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**Pelican Parts** · 08-28-2017, 04:05 PM

Hello and welcome to the forum! It seems that the links below are not able to be opened. Are you able to pull any codes?

**lecbr600** · 08-28-2017, 04:26 PM

Originally Posted by Pelican Parts

Hello and welcome to the forum! It seems that the links below are not able to be opened. Are you able to pull any codes?

Thanks for your reply!

I linked a Google photo video link , but Tapatalk (or bimmerforum... I don't know) seems to not accept such a thing...

So where there are ******* substitute with Google photo address that is

goo (dot) gl

(Dot)=.

I hope it's clearer!

**bluptgm3** · 08-28-2017, 04:56 PM

If you have a limited slip, I am going to guess LSD clutch chatter.
Change the fluid with a fluid containing molybdenum.

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**PbFut** · 08-28-2017, 05:53 PM

Agree with post 4. Change the fluid.

**lecbr600** · 08-28-2017, 05:57 PM

I don't know whether mine is a LSD, but I don't think so....

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**rf900rkw** · 08-28-2017, 06:11 PM

Looks like the 2.0 only had the LSD with the M Sport suspension. That's not a sports steering wheel, so the LSD is doubtful. Even if it was, it would be a Torsen, which don't chatter.

I have a tough time telling anything from videos. But to me it sounds more of a suspension groan than a diff chatter or CV clack. Bushings, shocks, shock mounts. Have you been under it for a visual inspection yet?

**lecbr600** · 08-28-2017, 06:16 PM

Originally Posted by rf900rkw

Looks like the 2.0 only had the LSD with the M Sport suspension. That's not a sports steering wheel, so the LSD is doubtful. Even if it was, it would be a Torsen, which don't chatter.

I have a tough time telling anything from videos. But to me it sounds more of a suspension groan than a diff chatter or CV clack. Bushings, shocks, shock mounts. Have you been under it for a visual inspection yet?

If so, why it does it only when it's warm? Usually after highways run. Instead after a cold start or with straight front wheels, no groans at all!!

However, I did a visual inspection, that I will try to repeat.
I will let to know! Thanks

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**lecbr600** · 10-15-2017, 01:08 PM

So, I've got time to inspect rear subframe, but I've noted nothing that it's worth to be mentioned (from my experience and knowledge).
So I tried to replace rear differential lubricant oil, with Castrol Syntrax limited slip 75W-140.

I did a test drive: I tried to warm up with a half a tour trip then I tested some narrow turn and saw any strange noise from diff. Fortunately no strange noise! I hope that problem gas been fixed.

Moreover, After old fluid has been removed, I shooted some photos inside differential case from drain-refill holes, in order ti understand if it's a open or LSD diff.
Any or you can help me in identify the differential kind?

Thanks.

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**lecbr600** · 10-15-2017, 03:11 PM

I replaced lubricant oil of differential. I put Castrol Syntrax limited slip 75W-140.

The terribile noise I heard seems to be gone.

I shot some photos from the drain-refill plugin holes. Do you think mine is a LSD ? Torsen?

Thanks.

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