This morning I started hearing a loud, repeating, thumping sound coming from my 04 ralliart. It seems to be coming from the back left wheel. The sound is constant and speeds up as my car gains speed and slows down as my my car does. It doesnt seem to effect how the car drives at all. Does anyone have any ideas on what the issue may be, or anything I can do to diagnose this sound?

 

Can you feel anything? Vibrations ect, or is it just sound...? If i may go out on a limb here, I would suggest having a look at your tires as a belt could have shifted. My dad's gone through many tires due to shifting belts and they cause sort of a thumping sound...

 

No i dont feel any vibrations. I checked out all my tires and didnt find anything unusual. Would this be noticeable?

 

wheel bearing perhaps? did you hit anything before the sound started?

 

A shifted belt could be invisible, or could cause a deformity. Have a close look inside and out.

 

when you hear it, pull the hand brake a little and see if the sound changes...

 

no, not that i can recall. i didnt notice it when i first started driving that morning, but when i got to work, thats when i heard it.

 

is there danger in driving around if that is the problem?

 

what would this tell?

 

Potential to have a blowout while driving...if a belt is shifted there'd a weak spot in the tire that the air pressure will gravitate (for lack of a better word) to. All the pressure in one weak spot is not good.

 

it will tell you if the thumping sound is coming from inside the rear drum...

 

We have drums? Lol

 

my thoughts exactly

 

E brake is a drum inside the rotor on the back

 

i just had crazy deja vu