cold weather hiss

[klinkzor]

since the weather has been getting cold here my motor started making a hissing noise at part throttle. if i give it more throttle or back out of it the hiss goes away. it's fairly loud and almost sounds like a external exhaust dump on a turbo gas motor.

just wondering if it's normal since the other 7.3's i've drove have never made this noise.

 

[iracemine]

yes. its your exhaust back pressure valve doing its job. search ebpv in the search button, this feature will get you a ton of answers for every thing

 

[JLDickmon]

yes. its your exhaust back pressure valve doing its job. search ebpv in the search button, this feature will get you a ton of answers for every thing

x2 on both points.

The EBPV functions like a heat riser on a gas motor.. forces exhaust to stay in the engine longer and warms it up quicker.. and when it closes off, oh yeah, it sounds like a super-stock pulling tractor winding up..

 

[klinkzor]

i was just wondering since i drove the truck for 4 years at work and it's only started making this noise since i've owned it

 

[mikesf350beast]

mine is getting worse every day
i almost cant even drive it and i just replaced the ebpv and until it warms all the way up i cant even drive the thing
something has to be wrong!!!

 

[Crumm]

You may need to clean the sensor tube. It runs from the passenger side exhaust manifold up to a sensor mounted on top of the HPOP reservoir. The tube gets plugged up with soot. You can replace the tube or clean it out with a stiff wire chucked up in a drill.

 

[JRJ04]

You may need to clean the sensor tube. It runs from the passenger side exhaust manifold up to a sensor mounted on top of the HPOP reservoir. The tube gets plugged up with soot. You can replace the tube or clean it out with a stiff wire chucked up in a drill.

I used a piece of weedeater string attached to a drill and a can of brake cleaner...worked like a charm