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-   -   Thumping noise in the rear of the car.... (http://forum.e46fanatics.com/showthread.php?t=981764)

Jat007 04-13-2013 07:11 AM

Thumping noise in the rear of the car....
 
Hello,

I am hearing this light thumping noise in the rear of my 00' 323i e46 whenever I starting to move from a dead stop and whenever I accelerate when I am almost at a dead stop. Could it be the rear bushing of some sort?? Other than that, the car drives straight and normal.

Thank you in advance.

Jay

certify 04-13-2013 07:34 AM

I had a slight thumping sound when stopping the car. But for my case its intermitent. I changed the gearbox mount, rear diff mount but the problem still persist. Hope you have better luck than me, trying to solve this.

diM3tri 04-13-2013 08:31 AM

Check your rear subframe. 323's and 328's are prone to subframe cracking

NumbaOneNewb 04-13-2013 09:06 AM

Dragging a corpse?

Sent from my SPH-L710 using Bimmer App

Jat007 04-13-2013 05:38 PM

Had the rear subframe checked today and all looks good. No, I and not dragging any corpse for quite sometime now...

2esalinas 04-18-2013 07:11 PM

I'm having the same problem I've been thinking its the rear differential bushing but as well maybe my transmission? Any advise?

sunnyjay 04-18-2013 07:21 PM

In my case it was my diff bushings.

dre8119 04-18-2013 07:29 PM

Could be differential mounts. I had the same problem

jaymemaurice 04-18-2013 10:45 PM

when we say subframe, we actually mean trunk floor pan where subframe mounts onto. Fine metal fatiguing occurs, often on the left side. You cannot see it unless you cut a hole in your trunk or scrape off tar insulation.

Could also be the flex coupling in the drive shaft or some random bushing.

Jat007 04-19-2013 08:54 AM

From all the research on this site and the .NET, looks like you will have to drop the Differential to replace these bushings. There are tools that can help you to make the job easier. The total investment of these tools are about $250... You can also rent them as well.

This will be the summer project for me.

RonnieE46 04-01-2014 09:40 AM

Diff problem
 
If you can get the car on a ramp turn the prop shaft manually and see if it turns sooner than the wheels start spinning. I say this because on mine the prop turns about a quarter turn before the diff kicks the wheels into motion. If this happens you need to replace the diff. I have a 320 cab and I have that thumping sound but after checking all my bushes I turned the prop and discovered the issue. Hope this helps!!! Diffs are available on eBay from 100-200 depending on mileage and condition. :thumbsup:

AndrewReaganM 04-01-2014 11:44 AM

Could it be the center carrier bearing & mount for the driveshaft? I had a similar sound but it happened only at certain speeds while under moderate to hard acceleration. The rubber the held the bearing to the mount was completely torn apart and the driveshaft was just wobbling around in there.


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