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Old 08-13-2019, 12:48 AM   #4
FunElan
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Join Date: Jul 2012
Location: Dodging potholes in SoCal
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Step 1 would be to take the belt off and try spinning the tensioner on the alternator - could just be the bearing in there. The belt comes off really easy with just one bolt that releases the tension on the whole belt drive (except AC). Not a bad idea to just change all the tensioners, especially if they've never been done before. Maybe when you removed the oil cap it just changed the pitch of the whine because the idle changed.
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