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What's this whistle sound?

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Old 05-17-2013, 10:33 PM
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19687.3idi
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What's this whistle sound?
When I am really pulling up a hill I sometimes ( not always) hear a high pitch whistle sound? Moving the throttle does not change it. It sounds like a boost leak to me but it does not do it every time.
 
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Old 05-18-2013, 06:29 AM
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An air intake can do this. Can you get a vid of it (safely)?
 
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Old 05-18-2013, 08:13 AM
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Well it doesn't do it every time or the hole hill. I do have an A&E oil air filter.
 
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