The noise is coming from the fuel pump , Mine got louder until I got fed up of it so changed it for a new one not cheap but worth it for some peace and quiet. It might of kept going for longer but it was about to fail so instead of getting stuck somewhere It was changed. The pump was causing a few problems hard to start and a bit hesitant as its electric the bearings were causing the noise and you can't lubricate it. Shame there not cheaper to buy??
It might be the alternator noise. If you step on the gas is it getting louder and more high pitch? If it is, then yes you have weak ground, or so called ground loop. I am having a same problem even after I installed amplifier. I guess this car is not really good.
your manifold bolts are loose
Probably a cat that you ran over!
Is the humming noise happening all the time the brakes are applied? Does it change pitch as the car slows? Is it loudest just before stopping?
Noise is a sound with no discernible pattern and no specific pitch. It is often characterized by its lack of regularity and randomness. Examples of noise include static, white noise, and the sound of a crowd.
Noise.
usually you will be able to hear a abnormal sound coming from the exhaust. it may have become louder or when you reach higher rpm you can hear a high pitch noise coming from the in higher pressure in the exhaust being pushed out the small hole or if its a big hole you will definatly notice an increase in noise.
mosquito
Noise. Noise is defined as unwanted sound that lacks musical quality, harmony, or identifiable pitch. It is usually perceived as unpleasant and disruptive.
same
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.
Intake manifold vacuum leak.