I just picked-up a stethoscope at Harbor freight. Found out that the tensioner pully is going bad. I was worried it was the timing chain. Mechanic's Stethoscope (harborfreight.com) On my 2010, AC and no AC are different pulleys.(the way the belt is routed)
What amazed me about the stethoscope is that I could not only hear the pulley, but feel it as well. When I first stuck the end in there, I accidentally touched a moving part and it scared me. It sounded like 1000 demons were attacking me.
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