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Old 08-27-2009, 09:06 PM   #1
soldonthewerks
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Vibration at specific RPM range

Hey all,

I have a question regarding a strange vibration which occurs in 3rd gear between the engine speeds of 2000 and 3000 rpm. In order for the vibration to occur, the car must be accelerating through the speed range of 20 to 40. It is a deep vibration that reverberates throughout the car, you can feel it in the seats. What could be causing this? Engine mixture? Drive shaft mounts / bearings? Transmission mounts? Any help is appreciated before I go to the bimmership...

Thanks! Brennan
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Old 08-27-2009, 09:09 PM   #2
NiagaraXI
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Tires? Really it's a possible 20 things, does it go away or disappear/become less noticeable after 40? Hopefully its a simple tire/rim issue for ya.

Most all vibes I have had eneded up being tire/rim/balance related.
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Old 08-27-2009, 09:20 PM   #3
soldonthewerks
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Hey thanks for the quick reply!

Unfortunately I wish it were as easy as tire/rim/balance issues. My tires are brand new and the tires/rim combo was balanced at the dealership and also had a 4 wheel thrust alignment. So, unfortunately, I believe it might be something a little more in depth.

Thanks, Brennan
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Old 08-27-2009, 09:26 PM   #4
bumere46
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could be anything, take it to a shop
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Old 08-27-2009, 10:15 PM   #5
NiagaraXI
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I see, just double check your weights are still on lol I lost a strip of weights just a couple months ago, it was enough to throw a shake. Hey ya never know.


If the tires/rims are not it I agree, go to a shop, could be anything, so is it gone after 40 ? That is what makes me assume it was a balance issue somewhere that goes as the speed builds.
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Old 08-27-2009, 10:18 PM   #6
Motorglobin
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Quote:
Originally Posted by NiagaraXI View Post
I see, just double check your weights are still on lol I lost a strip of weights just a couple months ago, it was enough to throw a shake. Hey ya never know.


If the tires/rims are not it I agree, go to a shop, could be anything, so is it gone after 40 ? That is what makes me assume it was a balance issue somewhere that goes as the speed builds.
where exactly are those weights?
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Old 08-27-2009, 10:22 PM   #7
NiagaraXI
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Originally Posted by kejriwalv View Post
where exactly are those weights?
They could be either fixed to the rims edge ( common ) or I prefer they place it in the rim itself. They look like a small grey strip and depending on what you needed to balance are 1/2 inch to 3 inches. They are attached with a type of sticky glue, sometimes they fly off, rare but it happens. I ask for this to avoid picking up my car with weights on the rims edge


Last edited by NiagaraXI; 08-27-2009 at 10:34 PM.
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Old 08-27-2009, 11:02 PM   #8
soldonthewerks
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Hey guys, thanks for all the responses.

I've checked my weights, and they appear to all be there. Mine are on the edge of the rim btw. Ever since I picked up the car it seems to have done this, although it has gotten worse I think. So, to the shop it goes...
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