hey im new to this site and diesel engines...I have a hissing noise coming from behind the turbos, as well as quite a bit of cab noise at higher rpms. I have ran out of trouble shooting ideas and would like some help on what the issue may be so I dont spend countless dollars at the dealership

 

are you sure it isn't the turbo whistle?

 

haha im new but not that new...its a constant hissing, like a leak in the downpipe or something i thought it was just my wastegate frozen open since it was -35 for a good week here...unthawed the truck in my garage and didnt seem to change...so im thinking its something else just dont know what

 

no one has any ideas? would be very much appreciated

 

Check the flex pipe sections in the up-pipes. very common to spring a leak there. Most I see are the passenger side, you can see it from up top. Black part of the pipe=soot

 

ok thank-you i will check that

 

turns out its a hole in the y-pipe...which is unfixable to the normal man in his garage considering the cab has to come off....little over 1600 to fix...pretty happy..not

 

wow that's a lot of money to spend just to fix the hissing noise