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 > E46 Xi Forum

E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 01-11-2014, 09:38 AM   #1
CapsFanBen
Registered User
 
Join Date: Feb 2006
Location: Chicago, IL
Posts: 30
My Ride: 2003 330xi (auto)
Bump Steer

I have a 2003 330xi with 96k miles. I am using the Koni/Eibach suspension setup.

I have been experiencing bad bump steer for quite some time now, and it has only gotten worse after I lowered the car (but not by that much). Any ideas on how to combat this problem? I see that there are products involving the tie rods, but these products of course do not fit an xi as far as I can tell.

My camber is somewhat different right now from side to side. Could this be the source of the problem?
CapsFanBen is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 01-13-2014, 09:28 AM   #2
SamDoe1
Registered User
 
Join Date: Oct 2010
Location: Minnesnowta
Posts: 3,520
My Ride: Clubs baby seals
Control arm bushings, ball joints, and get an alignment. That should help fix the problem. Bump steer is caused when the car changes alignment during suspension deflection, this is caused by worn components.
SamDoe1 is offline   Reply With Quote
Old 01-13-2014, 09:29 AM   #3
unevolved
Registered User
 
Join Date: Jul 2013
Location: Houston, TX
Posts: 577
My Ride: 2003 325i
When was the last time you got an alignment? Some actual numbers might be helpful in diagnosing the problem.
__________________


In a bacon and egg sandwich, the chicken is involved, but the pig is committed. Be that pig.
unevolved is offline   Reply With Quote
Old 01-13-2014, 05:20 PM   #4
CapsFanBen
Registered User
 
Join Date: Feb 2006
Location: Chicago, IL
Posts: 30
My Ride: 2003 330xi (auto)
Thanks for the replies.

The following is the info that I have on the (toe) alignment that was done recently.

I have two pictures of computer screens. One is titled "Measurements" and says

Front

Camber: -1.1, -.8

Caster: 4.8, 5.4

Toe: .17, .17

Set Back: .06

The first number is the driver side.

Rear

Camber: -1.2, -.8

Toe: .14, .13

Thrust Angle: .01


Another screen is titled "Adjustments" and says

Front

Camber: -.7, -.9

Caster: -.9, 0

Toe: 0, 0


Thanks so much for the help!

Last edited by CapsFanBen; 01-13-2014 at 05:47 PM.
CapsFanBen is offline   Reply With Quote
Old 01-13-2014, 05:43 PM   #5
unevolved
Registered User
 
Join Date: Jul 2013
Location: Houston, TX
Posts: 577
My Ride: 2003 325i
Aside from springs, what's been replaced recently in the suspension?
__________________


In a bacon and egg sandwich, the chicken is involved, but the pig is committed. Be that pig.
unevolved is offline   Reply With Quote
Old 01-13-2014, 05:55 PM   #6
CapsFanBen
Registered User
 
Join Date: Feb 2006
Location: Chicago, IL
Posts: 30
My Ride: 2003 330xi (auto)
The control arms and ball joints are relatively new. I would need to go into my records to figure it out exactly. I think the passenger side tie rod was replaced recently but not sure about the other side.

The sway bar and links are original.
CapsFanBen is offline   Reply With Quote
Old 01-14-2014, 11:27 AM   #7
tomoyer
Registered User
 
Join Date: Aug 2011
Location: Reading, Pennsylvania
Posts: 785
My Ride: 03 325xi, 03 330xi
Send a message via Yahoo to tomoyer
Just curious about tire and wheel size, air pressures run in tires. I'm not saying that their may not be some parts of the suspension that need to be replaced because of wear (and not sure what all you did replace when the Konis and Eibachs were put on), but 97K miles is a bit low to have to replace a lot of suspension parts (other than struts/shocks).
No matter what, and also depending on road conditions, you will have a certain amount of bump steer from any car. Now if you have bad bump steer/line deflection hitting just the normal expansion joint, then there is a problem.
tomoyer is offline   Reply With Quote
Old 01-14-2014, 03:17 PM   #8
biglittledog
Registered User
 
Join Date: Aug 2013
Location: Boulder, Colorado
Posts: 38
My Ride: 2002 325xiT
Send a message via Skype™ to biglittledog
Smile

If you want to experience scary-bad bump steer…come drive my '63 International pickup with a solid front axle!
Good luck!
__________________
Steve in the foothills of the Rockies
1991 325iC
2002 325xiT
1967 Jaguar 420G
2003 Moto Guzzi 1100
1989 Honda XR600r
1968 BSA Shooting Star
biglittledog is offline   Reply With Quote
Old 01-14-2014, 09:37 PM   #9
CapsFanBen
Registered User
 
Join Date: Feb 2006
Location: Chicago, IL
Posts: 30
My Ride: 2003 330xi (auto)
So there is no issue with the alignment?
CapsFanBen is offline   Reply With Quote
Old 01-14-2014, 10:03 PM   #10
YaSureYouBetcha
Registered User
 
Join Date: Feb 2012
Location: MN
Posts: 126
My Ride: 2002 325xi
I'd check the sway bar end links, especially if they're the original. It's easy, lift the front of the car, if they're loose, replace. While it's up check the control arms and ball joints for any play. Since you seem unsure of the age, they could be suspect as well. Even if those components have relatively "low mileage" they could have been of less than desirable quality. Once your done, get an alignment.


Sent from BimmerApp mobile app
YaSureYouBetcha is offline   Reply With Quote
Old 01-15-2014, 08:21 AM   #11
unevolved
Registered User
 
Join Date: Jul 2013
Location: Houston, TX
Posts: 577
My Ride: 2003 325i
That seems like a pretty high variation in caster from right to left, given that it's not adjustable. That, to me, looks like there could be some worn-out suspension parts causing your problems. Were your control arm bushings replaced with the control arms?
__________________


In a bacon and egg sandwich, the chicken is involved, but the pig is committed. Be that pig.
unevolved is offline   Reply With Quote
Old 01-15-2014, 11:54 AM   #12
CapsFanBen
Registered User
 
Join Date: Feb 2006
Location: Chicago, IL
Posts: 30
My Ride: 2003 330xi (auto)
I've cracked up the front passenger side a couple times--a couple of bent control arms replaced.

Could the worn sway bar end links really be causing the excessive bump steer?
CapsFanBen is offline   Reply With Quote
Old 01-15-2014, 12:08 PM   #13
unevolved
Registered User
 
Join Date: Jul 2013
Location: Houston, TX
Posts: 577
My Ride: 2003 325i
Worn sway bar endlinks are unlikely. You say you've cracked several control arms?
__________________


In a bacon and egg sandwich, the chicken is involved, but the pig is committed. Be that pig.
unevolved is offline   Reply With Quote
Old 01-15-2014, 12:15 PM   #14
CapsFanBen
Registered User
 
Join Date: Feb 2006
Location: Chicago, IL
Posts: 30
My Ride: 2003 330xi (auto)
I seem to love cracking up the front passenger side--I have bent two control arms. I am pretty sure it was replaced with good parts.
CapsFanBen is offline   Reply With Quote
Old 01-15-2014, 12:31 PM   #15
YaSureYouBetcha
Registered User
 
Join Date: Feb 2012
Location: MN
Posts: 126
My Ride: 2002 325xi
Quote:
Originally Posted by unevolved View Post
Worn sway bar endlinks are unlikely. You say you've cracked several control arms?
Unlikely to be worn? Or unlikely to be the culprit? I would argue if they are original, they are very likely to be worn if not shot. Are they the culprit? Now that's debatable. However any week link in these suspension systems will accentuate noise, bump steer, etc. so they can certainly contribute. If OP has sustained damage to the front end, there are probably a whole host of factors were not even considering. Frame and or mount damage for instance. So again, I think OP needs to get this car up in the air (securely, don't crawl under a car using scissor jacks!) with both front wheels off the ground so the suspension is fully unloaded. Play on FCAB's, ball joints, sway bar, and end links will be apparent with some forceful wiggling of the components. But if the system has sustained front impact damage, then frame alignment is called into question as well.

OP "pretty sure" is "pretty suspect" IMO. I do my own work, and with the help of these forums and a few Indy friends buy high quality components. There are a lot of substandard replacement parts on the market. So if your having someone else do the work, you should be specifying component brands rather than accepting whatever part they throw on... That way you can be "certain" parts are of high quality.

Good luck!


Sent from BimmerApp mobile app

Last edited by YaSureYouBetcha; 01-15-2014 at 12:37 PM.
YaSureYouBetcha is offline   Reply With Quote
Old 01-15-2014, 12:57 PM   #16
CapsFanBen
Registered User
 
Join Date: Feb 2006
Location: Chicago, IL
Posts: 30
My Ride: 2003 330xi (auto)
What can be done to check/improve frame alignment?

Also, I say that I am pretty sure about the replacement parts being of good quality because I trust my mechanic--he is always saying how lots of the aftermarket parts are crap.

Last edited by CapsFanBen; 01-15-2014 at 01:01 PM.
CapsFanBen is offline   Reply With Quote
Old 01-15-2014, 02:16 PM   #17
unevolved
Registered User
 
Join Date: Jul 2013
Location: Houston, TX
Posts: 577
My Ride: 2003 325i
You can get under the car (safely on jackstands) and measure between points diagonally across the chassis, comparing readings. Say, from the front left subframe bolt to the right rear front LCA inner bolt, and vice versa (front right and left rear). On a perfectly true chassis, those measurements should be identical. It's not a perfect system, but it costs nothing and it's helped me diagnose alignment issues in the past (wound up being an unreported accident caused slight frame damage).
__________________


In a bacon and egg sandwich, the chicken is involved, but the pig is committed. Be that pig.
unevolved is offline   Reply With Quote
Old 01-16-2014, 09:04 AM   #18
CapsFanBen
Registered User
 
Join Date: Feb 2006
Location: Chicago, IL
Posts: 30
My Ride: 2003 330xi (auto)
But how do you then address a problem if one is found?
CapsFanBen is offline   Reply With Quote
Old 01-16-2014, 10:23 AM   #19
SamDoe1
Registered User
 
Join Date: Oct 2010
Location: Minnesnowta
Posts: 3,520
My Ride: Clubs baby seals
Come back here and post up your results and/or consult a trusted mechanic.
SamDoe1 is offline   Reply With Quote
Old 01-16-2014, 10:38 AM   #20
YaSureYouBetcha
Registered User
 
Join Date: Feb 2012
Location: MN
Posts: 126
My Ride: 2002 325xi
A really good auto body shop with laser measurement and frame rack. Modern autobody straightening machines are pretty cool, and for the most part do a great job of getting the car back to drive-able condition after an accident. Once your frame has been damaged, repairs can get it close, in some cases very, very close, but it'll never be "like it was" before the accident. It should, however get it close enough that once completed, along with suspension adjustment , alignment etc, the driving characteristics are back to "normal". Again, start with the easy stuff as originally posted, you can certainly take some measurements while your under there. Hopefully there's no frame damage, but if you've bent a control arm, even in a low speed fender bender, I would suspect there's some additional damage to frame/mounts. Just think of the force required to bend one of those arms, and the force on your frame prior, during and after the arm bent...

Good luck!


Sent from BimmerApp mobile app

Last edited by YaSureYouBetcha; 01-16-2014 at 10:42 AM.
YaSureYouBetcha 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 02:16 AM.


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