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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 08-23-2005, 03:56 PM   #1 (permalink)
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My '92 325i cabrio starts to "vibrate" at 80 mph and over.
I have standard basketweave wheels that are not bent that I know of. I have recently installed new control arms, bushings and tie rods. The vibration doesn't seem to be coming from the front or the back and the steering wheel does not shake but rather the whole car seems to vibrate slightly and I can't tell where it's coming from. ghead It's an automatic which shifts smoothly with out any problems. Could the differential be a possible culprit???
Any ideas would be appreciated.
Thx all.
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Old 08-29-2005, 01:08 PM   #2 (permalink)
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HMMMM.... either it was a tough question... or a stupid question..... or nobody cares??? used


[ quote=mysticguy04,Aug 23 2005, 02:56 PM]
My '92 325i cabrio starts to "vibrate" at 80 mph and over.
I have standard basketweave wheels that are not bent that I know of. I have recently installed new control arms, bushings and tie rods. The vibration doesn't seem to be coming from the front or the back and the steering wheel does not shake but rather the whole car seems to vibrate slightly and I can't tell where it's coming from. ghead It's an automatic which shifts smoothly with out any problems. Could the differential be a possible culprit???
Any ideas would be appreciated.
Thx all.
[snapback]371962[/snapback]
[/quote]
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Old 08-29-2005, 03:17 PM   #3 (permalink)
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Did it vibrate before installing the control arms/etc?

Did you get a 4 wheel alignment done afterwards?

How long has it been since the tires were rotated and balanced?
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Old 08-29-2005, 03:25 PM   #4 (permalink)
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My car used to vibrate a little around 50 or 60 mph---balancing the tires cured that....but that's so simple I'm sure you allready thought of that...
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Old 08-29-2005, 10:25 PM   #5 (permalink)
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How you been man? Sounds like your tires need a little balancing! Quite possibly the rear considering that the wheel does not vibrate.. Perhaps you have a U-joint that has seen its day! Wheel bearing?? See ya around
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Old 08-30-2005, 08:27 AM   #6 (permalink)
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Quote:
Originally posted by nukeduster@Aug 29 2005, 02:17 PM
Did it vibrate before installing the control arms/etc?

Did you get a 4 wheel alignment done afterwards?

How long has it been since the tires were rotated and balanced?
[snapback]373172[/snapback]
I don't think they did a 4 wheel alignment just the front end alaignment.
I'm going to be doing my brakes soon so when I get that done I'll have the tires rotated and balanced then see if the problem is solved.
Thx for the input.
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Old 08-30-2005, 08:35 AM   #7 (permalink)
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Thx for the input guys!
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Old 08-30-2005, 09:38 AM   #8 (permalink)
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Quote:
Originally posted by mysticguy04@Aug 30 2005, 05:35 AM
Thx for the input guys!
[snapback]373338[/snapback]
when bmws get aligned they are supposed to be weighted down with a certain ammount of weight based on the chasis. i believe the e30 is 150lbs in each front dr/pas seat like the z3 but i could be mistaken.

that also throws off your alignment if that wasnt done.

i bet its an unbalanced/out of round tire. thats what a vibration is more often then not. which is exaserbated by suspension bushings/pieces which are old/saggy.

have them do a road force test on your tires.
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Old 08-30-2005, 10:53 AM   #9 (permalink)
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Quote:
Originally posted by nukeduster+Aug 30 2005, 08:38 AM--><div class='quotetop'>QUOTE(nukeduster @ Aug 30 2005, 08:38 AM)</div><div class='quotemain'><!--QuoteBegin-mysticguy04@Aug 30 2005, 05:35 AM
Thx for the input guys!
[snapback]373338[/snapback]
when bmws get aligned they are supposed to be weighted down with a certain ammount of weight based on the chasis. i believe the e30 is 150lbs in each front dr/pas seat like the z3 but i could be mistaken.

that also throws off your alignment if that wasnt done.

i bet its an unbalanced/out of round tire. thats what a vibration is more often then not. which is exaserbated by suspension bushings/pieces which are old/saggy.

have them do a road force test on your tires.
[snapback]373342[/snapback]
[/b][/quote]
Okay I'll check it out. I know for sure that when I got the control arms and tierods done they didn't do that weighted alignment process. Thx for the info!
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