TwinTurbo.NET: Nissan 300ZX forum - Sounds like a idler pulley.
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Subject Sounds like a idler pulley.
     
Posted by Draker (Eugene, OR) on April 21, 2011 at 5:57 PM
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In Reply To Whining Noise-Video posted by MJawn on April 21, 2011 at 03:36 PM
     
Message I knew you did a 120, but I've seen pulleys bad from the factory. Pull the timing covers and use a scope to find the sound. Also verify the tensioner as mentioned.

     
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