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Re: loud medium pitched humming sound when I start the...
Always go with the honda service tech for they are trained in ut specific car models.. they both can be right though... the noise may be from ur auto tensionor and or ur a/c compressor..those models have problems with the a/c clutch pulley bold breaking off and have problems with the a/c compressors blowing up
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I'm no Honda expert so I'm not sure if an 02 has a "key off" evap system. If it does that may be what you're hearing. A lot of newer cars will run evap tests while the vehicle is off. It basically pulls vacuum on the fuel tank with an electric motor to test the integrity of the evaporative emissions system and opens / closes vacuum switching valves.
The check engine light is telling the driver the computer has a problem with something that can affect performance or emissions. The problem is serious when the light is flashing. You would need to have the computer scanned for trouble codes to proceed.
The symptoms match those of wheel bearings getting worn out. One sure way to determine it is not coming from the transmission is by taking the vehicle to a decent speed, say 35 MPH ,and put it in neutral. If the humming continues unchanged, then it comes from bearings, and if it drops, then it might come from transmission or engine. 135000 miles is way over the life expectancy of a set of bearings. If the bearings are starting to fail, they produce a high pitch sound, almost a whistle, and if they are almost gone, they produce a deep rumble. High speed turns might subdue the sound, or make it worse, depending on if you take weight of bearings, or increase it.
MOST of the hums after a while come from the diff as the back axle does the driving and almost all its life runs the same way except when going in reverse ,is the rear diff meshing and worn on both the crownwheel and the pinion and the humming gets slightly louder the faster you go and almost goes when almost stopped and this can also be the slight vibration you get so get the diff oil drained and refilled and check if there is any metal in the oil when drained if so thats your problem But it will last for years like that..Let me know how you get on RON
is your ac compressor located on the left side as well and also try your ac if its not blowing to cold the rattling could be your ac clutch on the compressor if that is you will have to get a new clutch kit from your local auto parts store to fix it