I believe that an engine can create a noise underneath the middle of the hood....
if it was like my 99, then a belt was worn out, and will cause a chirping noise, if it is in the engine compartment, it is very likely to be a belt
A belt that is too tight will cause a squeal on a Kia Sportage. To resolve this issues just loosen the tension on the belt.
An air intake house can be the cause of wind noise underneath a 208 Mazda 6. The problem could also be a bad seal on either your window or door gasket.
bad coil springs
The most common cause of the rumbling noise underneath your vehicle is a bad wheel bearing or CV joint. You should not drive the vehicle until the problem is properly diagnose.
wheel bearing or it could be the carrier bearing as was in my case
Ha, lots of noise :]
Resonance is the answer.
maybe not CAUSE noise pollution,but they sure do affect it. ;-)
It makes a noise because of vibrations in the hole is the middle
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
Could be your CV Joint or tie rod