so a couple weeks ago i started hearing a very faint knonking noise while driving. slmost like a flat tire would sound like. slowly it started getting louder and at higher rates of speed such as 50 80. the steering wheel has a slight wobble same with the gas pedal. i think it may be a bent rim or the tires. any thoughts. i make sure to check the tire preasure by looking at the tires. the front driver tire has a slow leak i think every week it will lose at least 10 psi while the others hold

 

Hit any curbs recently? From what it sounds like is part of the bead isnt sealed or a belt shifted inside the tire. Check for bulges on the sidewall and feel the tread for any cupping. Could be a bad tire.

My work car (05 Grand Prix) makes a similar noise on the highway it howles with a thud, the tires are cupped cause of bad rear struts. I know what it is just waiting for the tires to wear more before I replace them and fix the struts.

 

any wheel missing a weight? may need a rebalance.

 

how many miles you got?

i have 55k and i have a wheel bearing thats on its way out. sounds a bit like how you described.

orrr it could be the hooker that's in your trunk. :P

 

very possibly could be swaybar bushings or your steering rack may be worn out. Does it do it when you steer back and forth fast or while hitting bumps or going into driveways etc?

 

possibly a goblin on the wing.

 

tiny unicorn in the exhaust?

 

if I could spell a noise it sounds like duh duh duh duh duh..... not crazy loud. a can feel a slightly while driving through my feet. possible tie rod, ball joint bad? hopefully just the tire cause the bead isnt sealed completely cause it keeps losing air

56k on it now

 

i'm having a very similar problem but i only hear it when i turn right. My left rear tire has a slow leak as well

 

well it turned out to be my front driver wheel bearing went out

 

why does cobalt's always have some kind of knocking sound?