Alright, I've had this problem recently, with my Supra, where it makes an odd sort of... Vibration noise if it's revved between about 3700 and 4800 rpm. It only makes this noise in 3rd, 4th, and 5th gear. Not first, or second, and not in neutral when it's stationary. I apologize if the description is very vague, but it's extremely difficult to explain what the noise actually sounds like, and a vibrational noise comes closest. I should explain that it sounds as though it's coming from in front of the dashboard on the driver's side. It's very loud and noticeable with the windows rolled up, almost as if it's coming from inside the cabin. I honestly have no idea what it could be - this noise hasn't made any ill effect (yet) on the performance of my vehicle either. I can't 'feel' any vibration coming through the shifter, or steering wheel, and the car itself feels stable when the noise is made.
I'm honestly stumped as to what it could be. Searching, it's possible that it's harmonic vibration, but I really don't know. I wasn't able to find anything conclusive.
For what it's worth, this noise came about after I changed my oil recently, from 10W-30 mineral to 0W-30 Castrol German Synthetic. The top end of my motor was freshly rebuilt about 2500 miles before I changed it. I don't know how that would cause a strange, vibrational noise, but it's worth mentioning.
I'm honestly stumped as to what it could be. Searching, it's possible that it's harmonic vibration, but I really don't know. I wasn't able to find anything conclusive.
For what it's worth, this noise came about after I changed my oil recently, from 10W-30 mineral to 0W-30 Castrol German Synthetic. The top end of my motor was freshly rebuilt about 2500 miles before I changed it. I don't know how that would cause a strange, vibrational noise, but it's worth mentioning.
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