Exhaust leak? Vacuum leak?
maybe clogged air filter or carburettar is sucking air and needs repairing
coz ur momma is in ur bonnet!
Could be a "hissing" sound
Might want to check the catalatic converter. if it is that, it's gonna be spendy unless you just drill a hole in the pipe.
A ferret that make a hissing sound means they are annoyed or irritated
To make a humming or hissing sound, like an arrow or ball flying through the air; to fly or move swiftly with a sharp hissing or whistling sound., A hissing and humming sound.
Geese make a hissing sound.
A cracked air cylinder could cause a hissing sound in a shock absorber during rebound. Another possible cause could be the seal.
it makes hissing vocalizations
Sound AMP problem or failure in the sub-woofer. Turn your speakers up all the way, do you hear any static or hissing? Could be a number of things, and it's not good.
Snakes are reputed to make a hissing sound.
Depends on where it is coming from. If it seems outside of the vehicle, it could be a hub bearing.