94 honda accord humming noise when car is in full speed?

94 honda accord humming noise when car is in full speed?

You'll have to tell us more information about the humming noise. Was the noise come through the speakers when the radio on? If it is then buy a "Ground loop isolator" or alike from Radio Shack or at any electronic stores and install it.

Defected wheel bearings will also causing the humming noise, tires noise? Or the vehicle need an alignment?

Wrong type of transmission fluid or the differential gears worn out inside of the transmission will produce the same noise.

Have a better description and where the noise is coming from, inside, outside, front or rear of the vehicle etc will help us to help you.

Edit: Send an e mail if you need more help cause I don't think that I'll come back to the question to see your updating information as I'll see it on my phone.HTH

Run your palm over the tires feeling for unflatness. As in feathered edges. This makes noise at 45 mph +.