I've got this annoying high pitched hum coming from the engine bay on the tranny side. It's there when I idle and I can hear it resonating off of curbs while I'm driving. I know it's not the intake because I can hear that whistle too. This is more of a high pitch humming noise. Only things I have done are AEM CAI, SK2 SS, and I replaced tranny fluid with Redline about a month ago. I noticed the noise start not long after the fluid change.
Any suggestions would help. Thanks.

 

sounds like your alternator might be going....mine went last week, i replaced it and the noise/"hum" went away along with my problem of not able to start the car.......the "hum" would rise with the acceleration and lower with lettin off the gas

 

This hum is pretty much constant all the time though.

 

Wheel bearing?

 

If you have your manual look at the tranny fluid section, it says to use only honda-acura premium transmission fluid, it says if you use anythign else use Dexron III fluid for the SHORTEST amount of time possible.... just a thought...

 

Redline fluid has been used by a lot of other people, even on here. So I doubt it's that but that's why I'm asking, to see if anyone else with it is having this issue.

As for wheel bearing... I hear it while idleing as soon as I start up the car...

 

My ABS unit use to make a high pitched noise when idleing. It comes and goes and sometimes after I shut it off the high-pitch sound will go for another second or two. Haven't been able to fix it yet but you could check that out if you have ABS.

 

It probably is the alt but the alt is on the drivers side only thing . All the other possabillitys wheel bearing and the tires wouldn't cause this at idle . If you take the belt of the alt and spin the pulley you should feel a grind or here noise

 

What exactly do I need to check for?

 

Here's a short video with with audio of what I'm hearing hopefully this helps...Here