my fuel door was not held shut and would sometimes open and shut and make an odd noise.

exhaust hitting could be a possibility.

here's a new scary noise...

got my new brakes and struts etc... drove for many 1000's miles, then yesterday, in line at a drive through front brakes started making weird noise, like the caliper was hitting something, slowly drove a block back home to see what happened...

I didn't tighten the brake disks to the wheel hubs when i sent them to the machine shop... got it all back, mostly assembled, brake disks mounted and wheel bearings installed ( supposedly ready to install... ) short story, one of the 4 10x1.25 bolts backed out enough to hit the brake caliper backing plate and bent!

replaced it and torqued all the bolts properly then checked the other side where i discovered the same thing!

it's my fault... that's why i was out in 100 degree sun fixing it.

be very careful till you know what's making the noise. it could be something bad.