'02 & '97 Powerstroke "hiss" on cold start

[2broke2smoke]

good freind just straight piped his '02 'stroke when cold it will spool up and hissssssssssss sounds just like an exhaust brake when it's used to warm up a cummins



started a girls '97 stroke at work to warm it up for her ... same hisss



both trucks are stock



the '02 is a six speed and it will actually slow/pull down the truck when it hiss'



any one know what the 'stroke does to warm up

 

[TWilkening]

You'd be right in saying that it's like an an exhaust brake. It's called the Exhaust Backpressure valve. It's a butterfly valve that's mounted onto the turbo that closes to help warm up the engine. A friend of mine has a 95 with a 5" pipe, and you can definitely hear that hiss when he starts it up.

 

[Sasquach]

my cousin's ford does it as well- talked to a diesel mechanic buddy, and he said that its a valve that recirculates some of the exhaust back into the motor to help warm it up. i dont know exactly where it is, prob in the turbo housing somewhere. hope this helps, chuck

 

[SRadke]

They often call it a "warm up valve". It's basically an exhaust brake that helps to warm the truck up. I think TS performance even makes a deal to fool the ECM into turning it on for use as an exhaust brake, they are that much alike.



-Scott

 

[bmoeller]

talked to a diesel mechanic buddy, and he said that its a valve that recirculates some of the exhaust back into the motor

That would be an EGR valve.

i dont know exactly where it is, prob in the turbo housing somewhere. hope this helps, chuck

It is bolted to the rear of the turbine housing.