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Old 09-13-2010, 11:14 AM   #1 (permalink)
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Join Date: Jul 2010
Car: 2006 X3 3.0i
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2006 X3 Undercarriage/Transmission Whine

I bought a certified pre owned 2006 X3 - roughly 60k miles. It had a few problems that the dealer corrected, but I'm still stuck with a strange noise coming from the undercarriage.

I know it is hard to describe a sound with words. It sounds like a soft metallic whine, or squeal, perhaps like a small chain spinning, or even like some pennies spinning in a glass jar.

Of course I can't tell where it's coming from under the car, but it's certainly more at the front half, so it's engine/transmission related. I would guess transmission.

It only occurs during acceleration, and usually around 1000-2000rpm. It may be occurring at higher revs, but the wind and engine drown out much of the sound.

I first noticed it in a parking garage, where it is apparent to anyone. Now it's getting louder and I hear it as I drive down the street.

I took it to the dealer, and they said it would "take too long to diagnose" and "we'll just have to wait for it to get worse." That's not the answer I was looking for.

Does anybody have some tips of what this could be? Thanks!
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