Hey folks...
I know this has always been there since I bought the car in December 04...but it is driving me nutso lately.
My 94 TSi has an engine vibration that is pretty damn strong but only between 3400 and 3900 RPM on the stock tach. This vibration is just as strong in any gear under load or not. When on the other side of this RPM range it is SMOOTH as glass! Especially at highway speeds above 4000 RPM it is quiet, smooth and quick to respond to added throttle. Only problem is speed limits here in Colorado are 75MPH and 4000RPM in 5th is just a tick past 85 and the State Patrol don't normally let 10 MPH over slip by!!
Any help or ideas as to what this is would be great. It is about 25k miles away from needing a timing belt and thought maybe the balance shaft or it's belt might be at fault. When I had the oil pan dropped I grabbed the balance shaft and tried to twist it and there was ZERO play in the shaft so I am assuming the belt is ok...
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