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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.

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Old 10-12-2011, 07:01 PM   #1
ProblematicE46
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Join Date: Oct 2011
Location: Boston
Posts: 18
My Ride: 2004 325xi
Floorboard vibration

Hi everyone, I purchased an 04' 325xi with 90k miles from my brother. He's had it since it was about 30k miles and about 5-10k miles back he started having this problem, and purchased new tires and replaced the boots on the front axles. Since then I bought it and replaced the front lower control arms, bushings (bimmerworld powerflex ones), ball joints, and just did the roadforce balancing on all four tires. This problem seems endless, after reading the forums it seems like the list COULD be: tie rods, sway bar end links, wheel bearings, front axles, or alignment. The problem happens between 55-80mph on the highway, you feel a shudder or vibration on/around the gas pedal or floorboard near it. The steering wheel shakes slightly it used to be worse before the LCA's... The car doesnt shake like some people mention theirs do when you press the brakes, and Ive been looking at the forums and seeing that alot of it is after long drives, but for me the second im on the highway at these speeds I notice it. Is there any way the cv joints/axles could be creating this on the highway without making any clicking? It doesnt make any noise on turns as far as I've been listening to it so im not sure where to start, I dont wanna sink another $1000 to find out that it didnt help haha.
Thanks!!
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Old 10-12-2011, 10:18 PM   #2
Kubica
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My Ride: 2003 325xi
Motor mounts, axles, front diff and TC fluid is where I'd start to look.
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Old 10-13-2011, 07:20 AM   #3
ProblematicE46
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How do you check your motor mounts? and is TC fluid the torque convertor/tranny fluid? and does the front differential actually have fluid of its own like a real axle in a car?
thanks!
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Old 10-13-2011, 07:52 AM   #4
BLAU III
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My Ride: eat's cars.
I had the same problem and went through a lot of the same fixes to find it was my motor mount. They are grease filled so if it's bad you'll see gunk leaking out.
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Old 10-13-2011, 08:36 AM   #5
ProblematicE46
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sometimes when idling i notice a slight vibration as well... could this lead to possibly being the motor mounts?
thanks!
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Old 10-13-2011, 01:52 PM   #6
ProblematicE46
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I just did the motor mount test and it seemed to have moved at least an inch! Im almost positive thw motor mounts are bad, and did you definately have the vibration feeling near your feet? And how long did it take to do? Thanks!!
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Old 10-13-2011, 02:53 PM   #7
Kubica
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Passenger side is easy. Drivers side is harder, since you need to drop the subframe a bit to squeeze it out.

Use a jack and a piece of wood to support the engine. Do one at a time.
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Old 10-13-2011, 09:58 PM   #8
GunnerB
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Join Date: Aug 2011
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FYI just changed my mounts and it cleared up that shudder at idle and overall got rid of my vibration that was left over after I replaced my axles. Pretty easy to do only took me about 40 minutes.
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Old 10-14-2011, 06:30 AM   #9
ProblematicE46
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Are transmission mounts as easy to do in one shot while you do the motor mounts? How about front subframe or any others that are worth it?
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