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2009 OB 25l - Distinct engine whine increase-decrease with RPM


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Hi All  - Replaced timing belts, idler , tensioner etc. Drove the car 300 miles and let it sit for a day.Got back in and heard a distinctive hi pitched whine, lower at idle higher at speed coming from engine. Not discernable at freeway speed (too high pitched?). Got back in the car the following day and didnt hear the noise. The noise was way too   obvious to be "normal". If I knew more I might suspect a problem with the alternator...but then it could be any of the other items replaced? Any thoughts would be most welcome! 

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