Question about 2004 Mazda 6

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How do I find out out what is causing the very loud humming/whining noise.

My Mazda 6, 2.3L is making a horrendous loud humming or whining noise, I think at the exhaust intake, any ideas?

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Did you check your pcv valve on the other Asian cars the diaphragm gets wholes burnt in and causes that a lot will also cause a slight miss .
My number is 270-556-7357 you can text me more about and I will help you all I can

Posted on Apr 09, 2015

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Most humming whinning noises come from the belt area and are caused by worn out bearings in pulleys. ( alternator,tensioner pulley. idler pulley etc ). I would remove the belt and spin all the pulleys one at a time with my hand to see if one is noisy and replace it if so

Posted on Apr 11, 2015

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