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Resonance at 2100RPM in 2002 A4 1.8T

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Old 01-06-2003, 03:40 PM
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Default Resonance at 2100RPM in 2002 A4 1.8T

Can anyone help me out there. I have a new 2002 A4 1.8T manual transmission and a few
months ago I started noticing this annoying vibration/resonance everytime I hit 2100RPM by
either accelerating or deccelerating past 2100 RPM. I cannot explain how annoying it is, it is
making me paranoid and taking away all enjoyment from driving because I can sense it
coming.
Sometimes the whole centre console and right side of the dashboard even vibrates.
any suggestions out there on what could be causing this; and why ONLY at 2100 RPM?
Old 01-06-2003, 03:54 PM
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Default gmm, have this slight resonance noise at a certain RPM when accelerating

sometimes, especially under hard accel, multitronic, some people trace it to the coin holder, yours sounds like a greater issue.
Old 01-06-2003, 04:10 PM
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how bout poking holes in the mufflers for a nice tuned effect.
Old 01-06-2003, 04:37 PM
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I have noticed the same resonance, but mine is barely noticeable. It is at 2100, though.
Old 01-06-2003, 04:58 PM
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Mine is the same. I never drive at that engine speed. Keep your revs higher with gear changes.
Old 01-06-2003, 05:22 PM
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Default Re: Resonance at 2100RPM in 2002 A4 1.8T

I have the exact same problem. 1.8t CVT. The sound comes around 2200rpm for me though. REALLY annoying. I searched around AW and found this to be similar: https://www.audiworld.com/tech/eng6.shtml
What do you all think?
Old 01-06-2003, 07:00 PM
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Wagoneer is correct. What are you doing driving around @ 2100 for? Buy a Buick.
Old 01-06-2003, 07:24 PM
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Default i have resonance as well....but mine's a little higher. (26-2800)

i think it just has to do with the natural resonant frequencies of the exhaust (APR.)

mike staley at APR houston didn't seem to think any ill of it, so if he says it's cool, then i'm fine with it.
Old 01-07-2003, 03:24 AM
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i had the same problem as you in my CVT, but after i passed about 4k miles, it went away.
Old 01-07-2003, 08:08 AM
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Default I had that same problem

I had the same problem and I took it to the dealership and then they took apart the area right below the steering wheel and then fixed the problem. I think that something was loose and then it needed that particular frequency (~2200 rpm) to vibrate. It was a pretty quick fix.


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