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Formerly CursedtoFirst45
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1,225 Posts
Discussion Starter #1
i have an easily heard hissing type of noise when the truck is cold coming from underneath. i think it started when i installed my cps a month and a half ago or so, but i didnt dwell on it. what could it be. it happens when the truck is cold/ when first started when not cold, but it usually dies down or stops when i push on the clutch. is it a clutch cable problem or what? kinda an annoying sound./

truck is 1996 f250 powerstroke
 

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its not the ebpv your describing is it?
 

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TDG MAFIA MEMBER #77
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940 Posts
Sounds like the Exhaust Back Pressure Valve to me. Normal operation in colder weather. Does your truck feel sluggish or like you have an anchor tied to it when the hissing sound is happeninng? If yes it is the EBPV.
 

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Resident GINGER
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775 Posts
Every time i start mine, after a few secondes i get a hissing sound and the engine bogs a little then returns to normal, but i think that it is just the EBPV closing and opening. I don't care, it's doing it's job and it sounds kinda cool.
 

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Formerly CursedtoFirst45
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Discussion Starter #5
hmmm...i havent ever really noticed it being overbearingly slow when its hissing, but where do i find a ebpv and are they expensive
 
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Its doing what its supposed to do. When the oil temp and outside air temp are below a certain threshold, the computer closes off the EBPV (Exhaust Back Pressure Valve) to put a load on the engine, making it work harder and warm up faster.
 

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DIESEL FREAK
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126 Posts
cursedtofirst45 said:
hmmm...i havent ever really noticed it being overbearingly slow when its hissing, but where do i find a ebpv and are they expensive
I had a 2000 f250 and I didn't notice anything until I installed my exhaust. Don't worry about the hissing sound it is normal. It is a good way to piss the neighbors off in the morningLOL :woot: LOL
 

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Formerly CursedtoFirst45
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Discussion Starter #8
if it is the ebpv, why does it seem to go away temporarily when i push the clutch in
 
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Because its thinking you are getting ready to drive it. On the auto's...the hissing will stop when you depress the brake to put the truck in gear.
 

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Senior Member
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Yup, normal... If you left it longer it will also idle up to about 1100-1200 rpm's if you have the cold weather package. Makes a dandy exhaust brake too!
 

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Formerly CursedtoFirst45
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Discussion Starter #11
ok, is it better to switch my chip to high idle to let it warm up in the driveway so itll warm up faster?
 

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i dont know if a diesel is the same as what my f150 was but when it was cold it would make a loud hissing or whisteling noice and would stop when i pressed the clutch in so we pulled the tranny and replaced the clutch and figured out it was my throwout bearing was shot but like i said i donno if a diesel would do the same thing
 

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Glad I found this link, thanks for the detailed explanation, 4cstr! I knew it wasn't a bad thing as it only does this when cold (first diesel, haven't had it long), but didn't know what it was. As a follow-up, on my '99 automatic the valve will start to cycle on/off if I let the thing idle for a while prior to driving. If I did disconnect the plug, is the only consequence, (short of a soft ECM code being stored but no light), that it'll take a bit longer to warm up? Am also cosidering a muffler-delete pipe for the stock exhaust, I'm sure it'll sound like a "turbo-hoover" then, yes?
 

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The Irishman
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Senior Member
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Caos56 said:
speakin of converting the ebpv into an exhaust brake, i followed the instructions on this page (http://pages.prodigy.net/stevebaz/_import/pages.prodigy.net/stevebaz/index3.html)
and when its all hooked up correctly, nothing happens, Could it be stuck?
And if so should i replace it or clean the hell out of it?
take your down pipe off and make sure you can move the flapper it should have some resistance but you shoud be able to move it. it may just need freeing up
 
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