it is time to change bearing on that pulley
Wheel bearing?
Noise from floor on 96 Nissan Maxima could be as a result of poor shifting. This often occurs when you use the wrong gear oil.
Check for a slipping drive belt between encine crank pulley and AC compressor pulley.
loose exhaust
You need to be more specific. There are many kinds of engine noise! From your description it can be anything from a blown rod to a belt!
he he he
I am hearig a similar whirring noise in my 04 Maxima that increases in pitch as the car accelerates. I suspect it is the idler puley. I'm planning to replace it in a couple of weeks and will report ba.
Coming from the drive wheels? Could be worn CV joints
Stop driving it because if the chain goes you will ruin the engine. Get it fixed.
camshaft dephaser pulley
if your horn is stuck on makin noise pull the fuse out... or you can remove the whole horn assembly from underneath the hood
crickets