does the truck seem louder in the cab then it used to?

 

umm...not too much...i havent really paid too much attention to that though...so i would say not significantly...why do u ask?

 

Cause my truck cept gradually getting louder inside and then I gota roar under the hood and come to find out there was a big hole in one of the rubber hoses on the turbo pipes.

 

oh ok...well i havent noticed that yet...but ill keep an ear out for it...

 

The hiss sounds like your exhaust back pressure valve trying to stay closed. Does it go away once warmed up?

 

im thinking its your EBV valve... it could be stuck...

 

damb shane beat me too it

 

for the most part it does go away...but i can still hear a very faint hiss...if i hold it at 1500rpms in a high gear....at runnin temperature...but its not constant...it just does it on every revolution...

 

I think I have the same problem, kind of sounds like the defrost is on, if it is the valve how do get it unstuck, or does it need replaced?

 

Could also be a exhuast leak take a look at ur exhaust pipes coming down the back side of your turbo check for black smoke at all the claps... I had a hissing sound while excelatoring and it turned out to be an exhaust leak... GL hope u find the problem...

 

It is the EBPV. It will stop doing it when the engine gets up to temp. Mine will do it for sometimes up to a hour after it is started if it is really cold out. If you are running down the road with not much load it will kick back into it again. Brian

 

Joining in on this one, will it hurt to tie the valve open some how as long as you let it warmup before you drive it, and if not, then how would I go about doing so.

 

you can unplug the connector it wont hurt a thing at all. here is a pic of the connector you need to unplug. It is at the base of the turbo pedistal

http://www.powerstroke.org/forum/99...neral-discussion/13385-ebpv-plug-location-pic-wann-make-sure-its-right-one.html

 

will it hurt anything if its unplugged?

 

nope not at all mines been unplugged over a year. It will throw a code but wont set an CEL

 

I had that problem of the ebp valve staying on and found the ebp sensor was chocked full of soot AND its pipe too. they are on the front of the engine the pipe starts from the front of the passenger exhaust manifold and the sensor is right near the fuel filter assy (info off a 95) . instead of buying a new one i took the pipe of and ran a pipe cleaner through it the cleaned it out with solvent and compressed air. i picked the sensor clean with a small piece of wire. instantly fixed!

 

Devin has it right, this should be done as part of regular maintenance on a PSD. Brake cleaner will desolve the carbon build up in the tube. I was able to clean my sensor twice before it finally gave out. If you need a new sensor go to a IH dealer way cheaper than Ferd.