Engine Hissing Sound

Does anyone else hear this hissing sound coming from the engine?

https://1drv.ms/v/s!ApNEtzOWmPitgsVKuK-dbYXlfVEnXQ

Sounds like an early locomotive!

Just went out and checked mine, no such locomotive sounds coming from my '18.

torrin said:

Just went out and checked mine, no such locomotive sounds coming from my '18.

Click to expand...

Thanks for checking. Yea it doesn’t sound normal. It’s going in next sat.

Let us know what the dealer says.

Possibly a vacuum leak. Mine had a bad valve which hissed very loud. The vacuum leak got so bad on my 17 raptor the air actuated hubs would engage.

jsrick80 said:

Possibly a vacuum leak. Mine had a bad valve which hissed very loud. The vacuum leak got so bad on my 17 raptor the air actuated hubs would engage.

Click to expand...

I thought it might be a vacuum leak but it's not. This morning I turned the truck on and I didn't hear this nose. Drove 10 miles and I still didn't hear it. After my 40min drive into the office, I get out and hear it. It was definitely not as pronounced as the video I have here. This makes me think this is normal. Almost sounds like there is pressure building up somewhere and when this pressure is released you hear this sound. What I'm not sure of is if its due to the cold weather because I don't think I heard this when it was warm outside.

I heard something like that on mine the other day and it was during a cold start, it was in the 30's outside, might not be a problem.

Mine has same thing wtf is it ??


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