I just bought a 2017 super duty xlt with the 6.2l 2 weeks ago today. I have about 2100 miles on it already. Well tonight I noticed while it's idling it has a loud air hissing sound on top driver side of engine. Kinda sounds like a leaking air line on a shop air compressor. I checked all rubber lines trying to see what it may be. Is this normal on these engines???? Thanks

 

No not normal, definitely take it in and let them fix it for free.

 

Brake booster/line/grommet? I'd like to see this....

 

This has been discussed on the 2017 SD forum. I can’t recall what the outcome was (one truck had something replaced under warranty) but many can hear it while idling, especially with the hood open. Search that forum.