Whenever i accelerate, i can hear this whizzing type noise, coming from the belt side of the motor. I changed the belt and the tensioner and the noise is still there. You can hear it plain as day with the windows down and you can hear it through the vents with the windows up. its fine sitting at idle, if i sit there and rev it, u can hear it for a half second just as you start to rev it also.

What the hell could this be?

 

I got the same problem....it sounds horrible....bringing it in tomorrow to get it looked at....will let you know. Mine happens mostly in the higher RPMS (4k +)

 

i also have this happening...i hear this turbo whistle type sound in the 4,000rpm on up at WOT...dont know if it makes a difference, but i have a later model 2006 LS with the SAI(secondary air Injection)

 

see im hearing it as soon as i accelerate, even from a stop from idle.

 

yeah i get it then too

 

Ok ask GM about there catalytic converter recall. I had the same noise, they replaced the cat and the noise is completely gone.

 

i have a noise like that and i dont even have a GM DP anymore.

and as for the whistle 06 Balt mine started whistling after i threw the 2.4 manifold on.

i think its the air hitting that adaptor plate for the mani.

unless youre running stock intake mani.

 

could it be the starter or alternator?

 

i have an 05 ss/sc and i started getting this sound about a week ago... most frustrating sound ever. sounds horrible

 

starter is non active while car is running.

 

pretend its a turbo wistling?