My car is idling high. When I go over 40, noise seems increases. No engine lite on 2007 Honda Civic

The noise reminds me of a small plane as it rises higher in the sky. It is only evident while the car is in motion. I do not get an "engine light" signal or any other. This has been happening for several weeks. I keep the maintenance up-to-date. Mileage when this occurred about 100,000. Now at 102,000. Thank you

by in Nashua, NH on April 02, 2014
2 answers 3 comments
ANSWER by on April 02, 2014
It could be your alternator bearing is humming Have a mechanic to telescope your accessories on your engine
1 person likes thisFlag inappropiate
COMMENT by on April 02, 2014
And use a stethoscope as well..!
ANSWER by on April 02, 2014
Possible wheel/hub bearing also...
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COMMENT by on April 02, 2014
Thank you.
COMMENT by on April 02, 2014
U bet!