hissing sound
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hissing sound
heres the scoop i had my 7.3 replaced with a used 7.3 the engine is good however when it is cold the engine makes a hissing sound.when i warm up the truck after it has been sitting in the cold the hissing sound is very pronounced and when i drive that hissing sound is there when i accelerate with little power, but as soon as i let off the acelerater the sound stops.when i begin to here the sound upon acceleration if i step on it more it goes away.after about 15 min the sound stops and i have regular power on acceleration.oh and one more thing i dont here the turbo whistle but i do have power any ideas would be greatly appreciated thanks.i have a 2001 f350 superduty and the weather the past couple of weeks has been -30degrees celcius (cold).thank you for your time.
Post Fiend
Joined: Sep 2006
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From: Sioux Falls, SD
[QUOTE=kbeefy]
Oh yeah, check under your truck for some really cold snakes....
[QUOTE]
good one....
clintl,
The sound is normal. It is your EBPV closing to help the engine wam up in cold weather.
Oh yeah, check under your truck for some really cold snakes....
[QUOTE]
good one....clintl,
The sound is normal. It is your EBPV closing to help the engine wam up in cold weather.
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but when i drive i do not here the turbo whirring although i can feel it when i accelerate after it has warmed up and that hissing sound is gone.i looked for snakes under the hood but didnt see any i saw a pigeon 4 cats and a guy asking for spare change so i closed the hood so i think i am ok because i didnt see any snakes.but what about the turbo sound thanks.
Post Fiend
Joined: Sep 2006
Posts: 7,426
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From: Sioux Falls, SD
The EBPV reroutes the exhaust gasses in order to warm up the engine. So until your truck warms up it feels like you just disconnected/lost your turbo. Feels like a dog doesn't it? What temp is it outside?
After she warms up, all is back to normal and the world is good again.
AMiller or one of the other guru's will chime in with the technical data... oopps - you beat me before I was finishing my edit Alan! Your fast....
After she warms up, all is back to normal and the world is good again.
AMiller or one of the other guru's will chime in with the technical data... oopps - you beat me before I was finishing my edit Alan! Your fast....
Last edited by white Buffalo; Dec 8, 2006 at 06:04 PM.
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Freshman User
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what about the turbo whirring sound i dont seem to hear it i was in my friends truck his is 2 yrs older and i could really hear the turbo whistle.
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Post Fiend
Joined: Feb 2006
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From: Middle Tennessee
What year is your truck and his? He may have the earlier model with what is now known as the wicked wheel and you have a later not wicked wheel model.
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Cargo Master
Joined: Aug 2003
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From: Eastern Washington
Originally Posted by clintl
but when i drive i do not here the turbo whirring although i can feel it when i accelerate after it has warmed up and that hissing sound is gone.i looked for snakes under the hood but didnt see any i saw a pigeon 4 cats and a guy asking for spare change so i closed the hood so i think i am ok because i didnt see any snakes.but what about the turbo sound thanks.
All jokes aside, the EBPV should work when it's cold and has low/no exhaust backpressure. Your old motor was probably working as it shoud, and the new one had a clogged ebp tube. It's a common cause for weird EBPV operation. Clean and reinstall, you should be good (hopefully)
Post Fiend
Joined: Sep 2006
Posts: 7,426
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From: Sioux Falls, SD
Originally Posted by clintl
what about the turbo whirring sound i dont seem to hear it i was in my friends truck his is 2 yrs older and i could really hear the turbo whistle.