wheel bearing, gearbox or wind noise
Supercharger?
Previas have a history of a whining noise coming from the catalytic converter. There is a bracket inside the converter that when loose or has came apart creates the whining noise during acceleration. It especially is very pronouced during high speeds in the freeway. You might be in for an expensive cat converter replacement.
There could be many reasons why the Acura makes a high pitch whining noise. It could be that the brakes or the rotors are going out.
if it sounds like a high pitched whining then it may just be your cool air intake
If the pitch of the noise increases with speed and also comes and goes in turns i.e. it goes away in a left turn and returns or gets louder in a right turn it is probaly a wheel bearing going bad.
Fan belt slipping
when warmed up high pitch noise at idle and it gets louder during acceleration Response to : Can someone actually answer this question? This is my question and the above answer makes no sense.
your manifold bolts are loose
That noise is completely normal as long it lasts for a few seconds, and it's caused for AC system in while it reaches its normal working pressure
wheel bearing
Probably a cat that you ran over!
High pitch sound could be your superchager. Turbo's shoot out a spit of air sound. Maybe your jetta is supercharged stock. Espically if its a tiptronic transmission.
First thing that comes to mind is the water pump. most likely it's your power steering pump,