Z4MC Noise from front suspension...need help in troubleshooting - Bimmerfest - BMW Forums

Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E85 / E86 Z4 (2003-2008)

E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

Thread Tools Display Modes
Old 10-11-2009, 10:29 PM
nutzkicker617 nutzkicker617 is offline
Registered User
Location: So Cal
Join Date: Aug 2009
Posts: 21
Mein Auto: E86 M Coupe
Z4MC Noise from front suspension...need help in troubleshooting

Hello bimmerfest-

I have been roaming around this site for a few months now, and would like to thank all of you for contribution that has allowed me to learn so much about my 07 Z4MC. I have a problem and need your guys' help.

I took over a lease with 12 months left and then purchased the car when the lease was about to terminate. I loved the car too much to let it go. I was quite hesitant to purchase the vehicle because there was already some known under car damage when I stepped into it. I didn't know what happened to it exactly.

There were a few issues that I ran into, but I took care of all of them that I know of. The under carriage reinforcement plate was bent and touching the front right lower control arm. I removed the plate and bent it back so its clear of the control arm. I loctite'd the front and rear sway bar mounting bolts. One day, i felt severe vibration and it turned out that 2 of the passenger side motor mount bolts were broken and 2 were loose, so i changed all four plus loctite and also did the same to the driver's side as well.
This was not covered under warranty because my SA was being an ***. I tried calling BMW NA and had someone working on my case but I never got any of my $800 back for bolt extraction and replacement of passenger side motor mount/bracket and bolts.

I also loctited the front strut bar bolts. After all of those things were tightened, there were no clunks. But recently, whenever going over uneven pavement, i hear a small clunk and a what sounds like something grinding for a fraction of a second when i hit the bottom of the dip. Keep in mind that this car had some under car damage probably running over a median or something.

When I brought it into the dealership, they suggested changing the control arm and reinforcement plate (before i bent it back) for an additional $700. My question is, is a damaged control arm possibly responsible for the "grinding" sound i am hearing when turning into a drive way? I have been under there many times and everything seems tight. My other guesses are wheel hub replacement? Control arm bushing with one from UUC?

I will probably perform all the work myself.


Reply With Quote
Old 10-12-2009, 08:02 AM
pal's Avatar
pal pal is offline
S54=Living on the Edge
Location: New Jersey
Join Date: Nov 2007
Posts: 1,496
Mein Auto: 2007 M Coupe, 2004 Audi T
Grinding while turning could be the front wheel bearings. Usually when they are totally shot you hear the grinding all the time ... of course, I cannot say for sure without experiencing it first hand.

I would also visually inspect the control arms for bends/cracks and closely inspect the bushings on the control arms for visible cracks. Also check the suspension end links that attach the sway bar to the strut for a bend; and check for any additional play or leaking grease from the end link joints.
Euro headers w/relocated sensors|RPI scoop|K&N panel filter|KW Clubsports w/400lb Linear Rear Springs|RE RSMs|Zeckhausen CDV|SpeedBleeders|Stoptech Brake Lines|StopTech 4-pot BBK all around|BBS RGR 18x8.5/18x10|Potenza RE-11s
Texas Mile (March, 2010): 155.4 mph
Reply With Quote
Old 10-12-2009, 09:34 AM
jragan's Avatar
jragan jragan is offline
Officially Welcomed to the 'Fest
Location: Fort Worth, Texas
Join Date: Dec 2007
Posts: 471
Mein Auto: 07 Imola Red/Black MCoupe
The small clunk could be your strut-tower-to-firewall braces needing to be re-torqued (they need this every few thousand miles, it seems). The grinding is a new one.

There's a BMW TSB out for the motor mount bracket bolts failing...so it should have been covered.
His: E86 ///M Coupe: Pics Track Pics Vids
Hers: 997-1 C4S: Pics
Reply With Quote

See More Related BMW Stories

Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E85 / E86 Z4 (2003-2008)
Today's Posts Search
Thread Tools
Display Modes

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

Forum Jump

All times are GMT -7. The time now is 04:46 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms