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.

Attachment 125018

blow off valve

totally normal. it is the the bypass valve venting excess pressure.

Hi. I know this is a very old post, but did you ever find out if this sound is normal or not? I'm having the same sound, but it wasn't present before. Thanks, and video link below.