Noise when decelarating uphill

[elkaybmx]

I bought a 2005 F250 last year and its been running fine. Changed out all fluids, filters, etc. I live in the Northeast so its been in the 20-40 degree range lately. Recently I heard this noise while getting out of the throttle heading uphill. Almost sounded like a waste gate of some sort -a few pulses under the hood like a phew,phew, phew. Heard it again the other day and noticed I was making more boost on the hills. Got home and realized I had a bad rear caliper-rear wheel was hot all the way out to the tire. I replace the caliper, new pads, blead brakes and took truck out for a test ride. I was hoping the two were related but the noise is still there. It occurs when I'm in the throttle pretty good on and back out of it completely. Is it normal? Anything specific I should check? Thanks.

BTW this is my first post on this forum because I am no diesel expert for sure. Just wanted to say I still learned a ton from reading the great posts on here.

[strokin_not_cummin]

its referred to as a "turbo fart" backed up turbo pressure that is released back through the intake, it is completely normal and doesnt mean any thing is wrong

[jesilvas]

It's the excess boost being let out of the turbo and air filter. Since you aren't on the throttle the engine can't use it all and it just goes out the easiest way it can.

[elkaybmx]

Thanks guys for the fast response. Found turborfart and that is what it sounded like. Heart rate is now back to normal. Have a good new year.