HISSING EXHAUST

[conecraft]

I own a 2000 F250 7.3 - recentlly I have noticed a distinct "hissing" sound from the exhaust. I hear it when the idel RPM increases & at slow speeds around 1400-1600 RPM. When I step on it, it goes away. I am not experiancing any power loss. Any suggestions? (I'm in Michigan, 20-30deg)
Thanks

[SMKSTAX]

It's the EBPV or exhaust back pressure valve. Helps with cold weather warm-ups. Once the motor is warmed up it should go away. If it doesn't your valve is sticking.

[jfines@cox.net]

I agree. Mine does it too. I actually bypassed the computer and put my EBPV to a switch.
When I need it I use it for either warming up or, when towing.

[Marty]

Originally Posted by jfines@cox.net

I agree. Mine does it too. I actually bypassed the computer and put my EBPV to a switch.
When I need it I use it for either warming up or, when towing.

Functions as an exhaust brake... inexpensive and works pretty well above 2,000 rpm's!

[leroyc]

how do u by pass it

[jfines@cox.net]

I bought a set up off of ebay. It has relay's in it for when I hit the go pedal, it turns off.

All you really need to do is cut the wires coming of of the valve (located at the turbo) and then run them to a toggle switch that has a 12v power supply.

There is a write up in the DIY section. Just beware that the more you use it, the more chances you have of the valve sticking. As long as you keep that in mind, your all golden.

One day I will be able to remove mine and buy a real engine break. They will pull all the way down to 1000 RPM's. The EBPV is only good above 2000. I still wouldn't tow with out it, now that I got it.
I attached a picture that shows my 14,000 LBS 5er.

[conecraft]

So if I can't get to the fix right away, what is the harm that is can do sticking?? (I have two days of towing in front of me,, have to use the truck if you know what I mean...) THANKS

[Dave]

Wont hurt anything other than your fuel economy on your trip

[conecraft]

So with a sticking EBPV, is that acting as an engine break while I'm driving? I think I have been getting poor miliage lately, but haven't checked it, and at $3.59 a gallon,, I better have it running good. THANKS

[Dave]

Originally Posted by conecraft

So with a sticking EBPV, is that acting as an engine break while I'm driving? I think I have been getting poor miliage lately, but haven't checked it, and at $3.59 a gallon,, I better have it running good. THANKS

It pretty much is yes