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EcoBoost whistle and hoot sound

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Old 07-05-2012, 12:36 AM
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Default EcoBoost whistle and hoot sound

New to this forum. Took delivery of an MY12 F150 FX4 EB S-CREW 3 weeks ago, and put on the obligatory 1000 miles before putting it into towing service.

Have a travel trailer which is about 5k loaded, and took it to Yosemite last week. On the uphill grades, whenever letting OFF of the accelerator, I would hear a owl hoot sound. Don't notice this so much when there is no load, but I am attributing this to the turbo releasing pressure.

This is just a guess however. I can hear it if the radio is off, but otherwise, it is not overly loud.

Is this normal, or is there some issue that requires a dealer visit?

Thanks for any info.

EcoBoost whistle and hoot sound-newrig.jpg
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Old 07-05-2012, 02:23 AM
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blow off valve
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Old 07-07-2012, 12:43 PM
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totally normal. it is the the bypass valve venting excess pressure.
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