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#1
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vibration under acceleration - flex disc?
Was towing the trailer yesterday, and working it hard merging onto the freeway, doing a solid flat-out pull through 2nd and 3rd gear. 2nd seemed to be a little rough, but the top end of 3rd had a *lot* of vibration. Later on, I disconnected the trailer, and took her for a spin. The same issues persisted, with 3rd and 4th, in the upper ranges, being shaky enough that you didn't want to stay in the throttle. Definitely in the driveline. No vibration at low speeds, or at highway cruising speeds. If I downshift and bring up driveline rpm though at cruise speeds (3rd at 70mph) it definitely re-appears, regardless of being in the gas or just cruising. So something is going on... And the only thing that comes to mind is a flex disc. All new front suspension, and new 4 wheel alignment. Car is smooth otherwise. And it came on rather quickly, I don't recall any vibration in the past month, and I fairly regularly accelerate at those speeds. I do know that at high speeds, and high rpms (above 100+) it's always felt a little "trembly". Maybe with that amount of force on the flex disc, it's been slowly degrading over time, and now has reached the point where even in "routine" driving, it's apparent. Thoughts? Evan |
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#2
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I had this same problem. It took me two different shops, the later having a roadforce wheel balancer. They resoved my problem by finding two bent wheels that were not identified by the first"inexperienced" tire shop. Give this a check at a place with the premium wheel balancing machines. When the x is lifted up take a quick look at the flexdisc and look for tears, but it's prob not that. Good luck
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2001 X5 4.4i WHITE-Loaded like a baby's diaper SOLD |
#3
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Does the vibration exist at idle in gear also with foot on the brake?
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#4
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No vibration at idle. None at acceleration in any gear below 4000rpm. Seems to be very evident at higher road speeds, under max acceleration, and was *very* pronounced with the trailer. Having the tires rebalanced tomorrow (and rotated), but, i'm 99.98% sure this isn't a tire or wheel problem. This is something moving in the drivetrain. Feels to me like either a bad mount, or a bad support bearing for a driveshaft (had that on the old volvo, and the sensation is similar to that). It's definitely related to the amount of torque being put on something under stress of acceleration. And it's not in off the line torque, as that would be evident in first gear, and second gear, and it's not noticable in first or second gear. 3rd, and 4th, (and probably 5th and 6th - if i wanted to get a ticket).
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#5
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Is vibration in the steering or the whole car?
If it's the whole car it's either tires, drive shaft, or rear cv joints. Front CV Joints and motor mounts will cause vibration at idle in gear with foot on the brake. |
#6
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Iv had this problem for a while, iv posted on here and had quite a lot of feed back regarding the flex disc, I took a look but it looks new from looking at it from underneath, it drives me mad, I especailly get the vibration going uphill at a steady speed, its kind of a off and on vibration if that makes sense! Do x5's have just one flex disc? I'm not a mechanic so me checking myself was probably a waste of time though it did look in good condition but I didn't take the part off to inspect it properly! Would it need to be taken off to know if the flex disc was knackered? Cheers
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#7
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it's the whole car, it's something driveline related. I'll get it figured out soon...and post the results. It'll drive me insane till I do.
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#8
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sorry i read the title wrong, i think you get a vibration under the pedal and the floor pan area when its a worn flex disc, but thats just going by quite a lot of threads that i've read on it, let us know when sorted! good luck
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#9
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Figured I'd update this. On friday, I took the car in and had the tires balanced and rotated. No change in symptoms, though I thought on the ride to the tire shop that the vibration seemed more obvious at highway speed, in any gear.
Stopped by the local shop I use, and talked with my mechanic. Odd symptoms, according to him, and he and I did some research online. Didn't come up with anything conclusive. Just for the heck of it, I called my service advisor at BMW, knowing it might have to end up there. Described symptoms, and she looked up my vehicle, warranty expired that night, at midnight. She told me if I could get it in before 3p, have the shop foreman ride and verify the issue, they'd get it taken care of, though they couldn't look at the car until Monday. It's at the dealer, awaiting further diagnosis. The shop foreman said that my vibration was quite odd, and that he'd not seen that before. So...I'm ecstatic this is covered under CPO, and very curious what they wind up finding. I'll definitely update this thread when the problem gets resolved. |
#10
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Quote:
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