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 > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 06-13-2013, 08:22 AM   #1
farukh
Registered User
 
Join Date: Mar 2012
Location: Fort Myers, FL
Posts: 388
My Ride: BMW 325i 2002
Random knocks from underneath... Weird!

Hey guys!

So I recently noticed a really weird knocking coming from underneath the car, which you can feel, no only hear. At first, I thought it was something with calipers, because it knocked sometimes when I braked in slow speeds... BUT, it also randomly does it when I am just starting my car in the morning. And even weirder, yesterday, I was sitting in my car and it was off and it knocked from underneath so that I could actually feel it in my feet. I got out and there was nothing there.
Car runs great, no problems at all... Handling is great too, like always.
Anybody has any ideas on what can that be?
farukh is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 06-15-2013, 12:44 PM   #2
farukh
Registered User
 
Join Date: Mar 2012
Location: Fort Myers, FL
Posts: 388
My Ride: BMW 325i 2002
Uuum guys, anything?!?
farukh is offline   Reply With Quote
Old 06-15-2013, 01:00 PM   #3
tlester
Registered User
 
Join Date: May 2013
Location: Jacksonville, FL
Posts: 438
My Ride: 2001 330i
Worn flex disk, perhaps?
tlester is offline   Reply With Quote
Old 06-15-2013, 08:58 PM   #4
farukh
Registered User
 
Join Date: Mar 2012
Location: Fort Myers, FL
Posts: 388
My Ride: BMW 325i 2002
Quote:
Originally Posted by tlester View Post
Worn flex disk, perhaps?
Thanks for response! I checked mine and also did some research on it and mine seems to be fine.

Also, the noise that I have is way more random than the one that comes from flex disk/guibo.... And it is lower sounding.
farukh is offline   Reply With Quote
Old 06-15-2013, 10:15 PM   #5
Big Rick
Registered User
 
Join Date: Nov 2011
Location: Maryland - Land of Taxes!
Posts: 1,410
My Ride: 325Xi
Check your FCABs and sway bar end links...
__________________
NWS and Advertising Removed.
Big Rick is offline   Reply With Quote
Old 06-15-2013, 10:22 PM   #6
E46Moonlight
Registered User
 
Join Date: Oct 2008
Location: Bronx, NY
Posts: 2,592
My Ride: 2000 323i
maybe a rat trying to chew his way through your floor
E46Moonlight is offline   Reply With Quote
Old 06-15-2013, 11:30 PM   #7
farukh
Registered User
 
Join Date: Mar 2012
Location: Fort Myers, FL
Posts: 388
My Ride: BMW 325i 2002
Quote:
Originally Posted by E46Moonlight View Post
maybe a rat trying to chew his way through your floor
How would that make a knocking sound? Unless of course its trying to break through with its skull lol
farukh is offline   Reply With Quote
Old 06-22-2013, 01:35 PM   #8
farukh
Registered User
 
Join Date: Mar 2012
Location: Fort Myers, FL
Posts: 388
My Ride: BMW 325i 2002
Quote:
Originally Posted by Big Rick View Post
Check your FCABs and sway bar end links...
Thanks for reply! Checked both, no problems there!
farukh is offline   Reply With Quote
Old 06-22-2013, 01:38 PM   #9
farukh
Registered User
 
Join Date: Mar 2012
Location: Fort Myers, FL
Posts: 388
My Ride: BMW 325i 2002
Okay, so I drove a little more with this knocking and it came down to this: Random knocking appears only when slowly applying breaks at low speeds. The harder I apply breaks at slow speeds, the faster and louder the knocking gets! Also, sometimes when I turn my steering wheel all the way to the right I get this knocking. And finally, at speed bumps, when the front wheels get over the knocking appears.
Now it is definitely something to do with front of the car. It sounds like its drivers side, however, I took off my front wheels yesterday, checked calipers, break pads, and stuff behind and everything looked fine to me, nothing unusual.
Also, I was suggested that it might be suspension, however, suspension makes the noise when the car is pushed up and down... mine doesn't!
Any ideas guys?
farukh is offline   Reply With Quote
Old 06-22-2013, 06:27 PM   #10
E46Moonlight
Registered User
 
Join Date: Oct 2008
Location: Bronx, NY
Posts: 2,592
My Ride: 2000 323i
Random knocks from underneath... Weird!

Control arm bushings and or the control arm itself. Also could be tie rods, endlinks, or sway bars. Good luck.


Sent from BimmerApp mobile app
E46Moonlight is offline   Reply With Quote
Old 06-22-2013, 07:29 PM   #11
farukh
Registered User
 
Join Date: Mar 2012
Location: Fort Myers, FL
Posts: 388
My Ride: BMW 325i 2002
Quote:
Originally Posted by E46Moonlight View Post
Control arm bushings and or the control arm itself. Also could be tie rods, endlinks, or sway bars. Good luck.


Sent from BimmerApp mobile app
Thanks! Been under my car today again and it is definitely my bushings! I don't know why I did not notice it earlier. I could wiggle my control arm around like nothing. Thanks for the help
farukh 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 12:19 AM.


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