humming above 40mph

afstud6900 · 03-07-2008, 11:57 AM

ok so ive been noticing a rather loud humming noise in my 99 3.4 alero and its bugging me....it started about a week ago and i cant figure out what it could be. it wont happen until i get above 40mph and it sounds like a grand prix exhaust , its not too bad but i want to get it solved b4 something goes wrong.. then once i go under 40 it will go away.. so idk its just a loud humming noise , and my exhaust is brand new from the cat back.

AGT · 03-07-2008, 12:00 PM

Did you check the muffler hooks and rubber mounts?

afstud6900 · 03-07-2008, 12:08 PM

yea those are fine...i dont know what it is

AGT · 03-07-2008, 01:09 PM

The cat is new also?>

afstud6900 · 03-07-2008, 07:07 PM

i think so im would that be it ?

Mischief007 · 03-07-2008, 07:21 PM

Is it coming from the front possibly? Could be a hub since mine would make a humming noise above 40 km/h but below it, it went silent.

Ryan from Ohio · 03-07-2008, 07:41 PM

Front wheel bearings...

Get ready to have fun!

afstud6900 · 03-07-2008, 11:56 PM

how much would that be and how can i be sure? but when i get on the highway and get to about 60 or higher i dont hear it anymore..its only about 40-55 mph