My 1997 Honda Accord has started to make a loud hum-like noise about a minute after start up. I uploaded a video moving the microphone to different areas of the engine so that the sound can better be heard. I am unsure where it is coming from but you can easily hear it in the video. It starts off normal and then the sound slowly kicks in. Any help is greatly appreciated!!!

 

Welcome to HAF! I moved your post for better response.


Sound could be a bearing on AC, alternator, or water pump. Diagnostic w/ stethoscope req'd to isolate noise source.


good luck

 

Remove all the accessory belts, then run the engine, that will eliminate some possibilities...sounds like the timing belt tensioner...