E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > Suspension & Braking

Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-13-2013, 07:11 AM   #1
Jat007
Registered User
 
Join Date: Feb 2013
Location: Minneapolis, MN
Posts: 109
My Ride: 99' 323i
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
Jat007 is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 04-13-2013, 07:34 AM   #2
certify
Registered User
 
Join Date: Jan 2004
Location: Malaysia
Posts: 948
My Ride: 328i 2000
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.
certify is offline   Reply With Quote
Old 04-13-2013, 08:31 AM   #3
diM3tri
Registered User
 
Join Date: Apr 2012
Location: Fairfield CT
Posts: 607
My Ride: 330ci + stg2 Scoobie
Check your rear subframe. 323's and 328's are prone to subframe cracking
__________________


Current Cars:
'99 Big Turbo B5 A4 (the red one) ^^^
'13 GLI
'91 Ford F150 v8 5spd

Previous Cars:
'05 stg 2 scoobie wagon
'82 VW rabbit vert
'01 330ci
'84 633csi
diM3tri is offline   Reply With Quote
Old 04-13-2013, 09:06 AM   #4
NumbaOneNewb
Registered User
 
Join Date: Jul 2012
Location: Portland, OR
Posts: 2,675
My Ride: 2001 bmw 330ci
Dragging a corpse?

Sent from my SPH-L710 using Bimmer App
__________________
Portland Metro: ECU updates, Euro tune, euro corner delete, air bag light, DSC light, cluster and any led color change, soldering work, transponders for keys, and all custom work related to computer or electronics.DIY AK90 A walk through on coding your mcu and transponders EWS3 How to make your own key (ak90 review)
NumbaOneNewb is offline   Reply With Quote
Old 04-13-2013, 05:38 PM   #5
Jat007
Registered User
 
Join Date: Feb 2013
Location: Minneapolis, MN
Posts: 109
My Ride: 99' 323i
Had the rear subframe checked today and all looks good. No, I and not dragging any corpse for quite sometime now...
Jat007 is offline   Reply With Quote
Old 04-18-2013, 07:11 PM   #6
2esalinas
Registered User
 
Join Date: Apr 2013
Location: Nappanee
Posts: 2
My Ride: 330xi
I'm having the same problem I've been thinking its the rear differential bushing but as well maybe my transmission? Any advise?
2esalinas is offline   Reply With Quote
Old 04-18-2013, 07:21 PM   #7
sunnyjay
Registered User
 
Join Date: Nov 2011
Location: USA
Posts: 189
My Ride: 01 330i
In my case it was my diff bushings.
sunnyjay is offline   Reply With Quote
Old 04-18-2013, 07:29 PM   #8
dre8119
Registered User
 
Join Date: Jul 2009
Location: New York
Posts: 40
My Ride: destroys my wallet
Could be differential mounts. I had the same problem
dre8119 is offline   Reply With Quote
Old 04-18-2013, 10:45 PM   #9
jaymemaurice
Registered User
 
Join Date: Aug 2008
Location: Anchorage Alaska or Kitchener, Ontario, Canada
Posts: 757
My Ride: 01 330ci, 03 Passat
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.
__________________


Rain Sensor Retrofit: Here
Coupe Headline Replacement: Here

Last edited by jaymemaurice; 04-18-2013 at 10:46 PM.
jaymemaurice is offline   Reply With Quote
Old 04-19-2013, 08:54 AM   #10
Jat007
Registered User
 
Join Date: Feb 2013
Location: Minneapolis, MN
Posts: 109
My Ride: 99' 323i
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.
Jat007 is offline   Reply With Quote
Old 04-01-2014, 09:40 AM   #11
RonnieE46
Registered User
 
Join Date: Apr 2014
Location: West Midlands
Posts: 1
My Ride: E46 320ci cab
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.
RonnieE46 is offline   Reply With Quote
Old 04-01-2014, 11:44 AM   #12
AndrewReaganM
Registered User
 
Join Date: Nov 2013
Location: Lawton, OK
Posts: 34
My Ride: 02' 325xi OrientBlue
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.
AndrewReaganM is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 08:37 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use