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#1
05-19-2010, 06:32 PM
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Replaced front bushings with Powerflex - Need help identifying a vibration/wobble
However, noticing a light wobble in the steering wheel at certain speeds; but more importantly, when going over a bump at mid-high speeds (40+ mph), a much more severe/vibrant shake is felt on the steering wheel. Any thoughts/ideas as to what this could be? 
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#2
05-19-2010, 06:53 PM
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Well, the main reason the OEM bushing was designed the way it is would be to absorb some of the impact on the steering/suspension during driving. It is kinda like a small shock absorber built onto the thrust arm.
The solid polyurethane bushings transmit all of the feel from the bump through the steering straight to the steering wheel. That is one of the given side affects of the poly bushings. For the slight shake while driving, it most likely was always there but you couldn't feel it with the OEM bushings. It is most likely caused by wheel balance and may be worth having your front wheels road force balanced. (and make sure they actually road force balance, tell them you want the before and after printouts for each wheel)
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#3
05-19-2010, 08:53 PM
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NineKrpm,
Did you do the job yourself, or have it done professionally? We're in the process on making an offer on a pristine 2003 X5 4.4, and the pre-purchase inspection revealed that the only major item needing attention is the thrust rod (aka lower control arm) bushings, so I'd like to see if this is a job I could tackle myself and save some money. If you did it yourself, could you please describe the process?Or is there a procedure posted somewhere on this site? I've been searching, but haven't found anything yet. Thanks.
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#4
05-19-2010, 11:54 PM
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A member named X5Girl posted a great thread with writeup and many pics on changing the bushings over to polyurethane, but you will need a way to press the bushings out/in.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is
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#6
05-20-2010, 12:05 PM
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Quote:
 This is a very common complaint with the poly bushings on road cars. Save the poly for track cars, imo.
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Profeshenal spellar
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#7
05-20-2010, 04:57 PM
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Quote:
__________________
2006 4.8iS Black/Black with custom Audison Voce/Image Dynamics sound  Production Date - 10/05
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#8
05-21-2010, 05:53 PM
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Thanks for the feedback folks. I am going to revert back to OEM, but in steps. Next week I will replace the pull-rod bushing (number 7) with a new OEM piece. This piece seemed to have the most space built in to the bushing to allow it absorb the bumps and reduce the wobble. Assmuming it does or does not remedy the issue, I will replace the front arm bushing as well with an OEM piece.
Keep you guys posted. 
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#10
05-21-2010, 07:05 PM
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Well, when you go back with OEM clean up those poly bushings and I'd might be interested. Since I have free access to the tire balancer and alignment machines I should be able to keep the wobble out, and I might as well try them out since I'm about due for bushings anyways
PM me if that's an option and we'll discuss price.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is
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