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Old 24th February 2010, 17:03   #1
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Slight Vibration around 2250 RPM - what could it be?

I've had a weird vibration when the car is around 2250 RPM especially in 3rd or 4th gear, but it also does it in 2nd and 5th. Most prevalent when accelarting softly on my morning commute. It goes away after 2500 RPM. It's something new, never done it before. I feel it mostly on the steering wheel since that is my main connection to the car, but it's not exclusively on the steering wheel. Feels like I'm running over very little rumble strips on the road.

My first thought was motor mounts, but I really have no idea. Have any of you been through this?

I had the clutch and flywheel replaced 2000 miles ago.
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Old 24th February 2010, 17:14   #2
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maybe dirty injectors? or spark plugs!.. try running some injector cleaner, i had this problem in my 545i, but the vibrations were there all the time, not at a certain rpm. GL
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Old 24th February 2010, 17:36   #3
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I had a similar problem, and it turned out that the heat shield was rubbing against the exhaust.
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Old 24th February 2010, 17:37   #4
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Maybe one or more tire need to be rebalanced? Have you hit any potholes recently maybe your rim was bent VERY slightly.
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Old 24th February 2010, 17:38   #5
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Quote:
Originally Posted by xraym5 View Post
I had a similar problem, and it turned out that the heat shield was rubbing against the exhaust.
Interesting.
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Old 24th February 2010, 17:42   #6
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Originally Posted by ChaoticZen View Post
Maybe one or more tire need to be rebalanced? Have you hit any potholes recently maybe your rim was bent VERY slightly.
No, I doubt it. I'm a tire pressure fanatic. I have a big, vertical Ingersol Rand compressor at home and I always have them perfectly inflated and inspect them for the smallest of nicks. Plus, I'm the only one that drives the car and haven't hit anything lately. Plus it's always at the same RPM, not the same speed, which tells me it's an engine or drivetrain issue.
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Old 24th February 2010, 18:33   #7
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Quote:
Originally Posted by xraym5 View Post
I had a similar problem, and it turned out that the heat shield was rubbing against the exhaust.
I had this exact same problem about 1.5 years ago with a Audi A8L. Drove me crazy. Turned out to be a bent exhaust heat shield. Can you pin point the area roughly that its coming from?
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Old 24th February 2010, 18:46   #8
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Quote:
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No, I doubt it. I'm a tire pressure fanatic. I have a big, vertical Ingersol Rand compressor at home and I always have them perfectly inflated and inspect them for the smallest of nicks. Plus, I'm the only one that drives the car and haven't hit anything lately. Plus it's always at the same RPM, not the same speed, which tells me it's an engine or drivetrain issue.
Got ya, only reason I brought it up is that I have a very similar issue but only on the same speed, not rpm and I cannot visually tell my rim was bent until I went in for a balance and the tech there told me. Sorry couldn't be more helpful!
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Old 1st March 2010, 14:41   #9
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Dropped the car off at the dealer on Saturday. I went the extra step of writing the speed in each gear where it vibrates. Hopefully it eliminates the SA calling to tell me the couldn't duplicate the problem. Will post results of the issue.
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Old 2nd March 2010, 15:59   #10
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Arrrgh! Got a call from the dealer. They cannot duplicate the problem. I'm going over there to take a spin with the tech and personally show him the problem. This sucks.

I'll ask them to lift the car and check the heat shields. I wasn't going to tell them to try that (let 'em figure it out on their own), but at this point I just want the car fixed. Updates coming later today.
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