The Diesel Stop banner
1 - 4 of 4 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter · #1 ·
2011 F250 6.7 with 115k
Recent mods:
EGR Delete/DPF Delete
Intercooler pipe upgrade
S&B cold air
Gearhead Hot Street tune

I have started hearing a hissing, like pressurized air leaking, most noticeable from inside the cabin near the center(probably close to the turbo) . I have also noticed a consistent reduction in psi of about 5. I haven't noticed anything else different about the way it runs, it throws no codes, and I don't smell exhaust nor see any soot from under the hood. No exhaust smell from the cabin either. I also have noticed less wastegate and turbo sound (no surprise there). Can anyone weigh in on what it could be? I have fumbled around near the turbo but can't feel, see or hear any source of the leak, and it's particularly noticeable under load. I haven't figured out how to drive it and have my head near the turbo.

Sent from my LG-H811 using Tapatalk
 

·
Registered
Joined
·
24 Posts
I dont remember a drop in boost but my hissing sound was a loose back pressure sensor creating a hiss center to pass side, kinda tough to get to but worth a look

Sent from my SM-G900P using Tapatalk
 

·
Registered
Joined
·
8 Posts
Discussion Starter · #3 ·
I dont remember a drop in boost but my hissing sound was a loose back pressure sensor creating a hiss center to pass side, kinda tough to get to but worth a look

Sent from my SM-G900P using Tapatalk
That's what it was, it had come completely off. I forgot to post a response in this forum, but yes, that was the source. Apparently they are notoriously undertorqued, so a good first place to check for anyone hearing that sound. Thank you for the reply, Gummer350.

Sent from my LG-H811 using Tapatalk
 
1 - 4 of 4 Posts
Top