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I noticed after driving my truck hard one weekend that it now idles slightly higher at about 800 RPMs and it’s got an odd louder noise when idling that increases as I rev the engine. Definitely an added noise on top of the normal engine noise. It’s not really a ticking noise but more of a lower tone whirl or growl. The AC is off and the engine is warmed up.

View attachment 231456

Any ideas on what could be causing it? There are no Check Engine lights on.
Take the belt off and start it for a few seconds and see if the noise is gone.
 
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