I have a 1998 Accord EX V6 Coupe with 103 k miles --

Whenever I'm on the gas, I hear a whining/whirling noise from the engine compartment. The faster I go, the faster and louder the whirling until it reaches a constant whine at about 70 - 75 mph. Let of the gas, the noise disappears.

I've replaced the tires, and had the CV joints, wheel bearings, and related parts inspected by the local honda dealership. The training was replaced about 50 k miles ago.

Has anyone else experienced this, or have an idea about what may be causing it?

Thanks in advance...

 

alternator

 

I'll check that out, but the Alternator was replaced about 20 K miles ago. Thanks for the help!

 

sounds like the wheel bearings. does the noise become an annoying "hum" that makes you turn the radio up just a little bit more than you did before? Recheck those bearings again. If the sound is like noisy loud snowtires than it's your bearings. I have changed 3 wheel bearings on my 99 Accord and have an extra bearing for the last change. The rears are relatively (?) easy to change. The fronts I am not so sure of.
There are several ways to tell if it's your bearings. I can't tell or describe to you about the "feel" of the bearings if you jack up a wheel and rotate the wheel back and forth ( remove the tire and rotate the hub for a direct metal on metal feel) but perhaps you could compare a front to a rear one? Also the noisy bearing could be hot and this might make this particular wheel hotter than the others - compare by touch?
The best way I can tell a bad bearing is a road test. Get on a road and get up to a safe speed where you can hear the whining noise clearly. If I remember right if I gently but forcefully "swayed" the car back and forth the noise would stop when the car, and wheel bearings, received it's greatest sideways force. I know the noise stopped stopped at some point while I was swerving. Go out and give it a try.

 

Oh yes you can in fact hear a bad bearing if you are in a car next to the suspect car on the freeway. I had a friend "circle" my car on the freeway and listen and he said he could hear a difference. I remember hearing the whine from my car echoing off tractor trailer wheels next to me as well. The whine also gets really loud on a narrow freeways with close gaurdrails.

 

Wow.... that is great info. I will definitely re-check the wheel bearings using recommendations.

Thanks very much!