Tensioner noise under hood?

Charlie G

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Oct 22, 2023
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I got this noise coming from the engine bay, I don't think it's the belt or the idle bearing cuz I replaced both of those relatively recently, anyone have ideas what this is? It's the noise that almost sounds like a hissing noise, it's not constant and it's not really and squeal it's just like a hiss.
 
Really hard to tell from the video but you can rule out the tensioner system by spraying some WD-40 or similar on the belt and pulleys as it's spinning to see if it goes way.
 
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