hissing noise - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 10-16-2007, 05:23 AM Thread Starter
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hissing noise

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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post #2 of 17 (permalink) Old 10-16-2007, 05:35 AM
 
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its not the ebpv your describing is it?
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post #3 of 17 (permalink) Old 10-16-2007, 05:40 AM
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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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post #4 of 17 (permalink) Old 10-16-2007, 06:05 AM
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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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post #5 of 17 (permalink) Old 10-16-2007, 03:28 PM Thread Starter
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hmmm...i havent ever really noticed it being overbearingly slow when its hissing, but where do i find a ebpv and are they expensive

Eric

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post #6 of 17 (permalink) Old 10-16-2007, 03:36 PM
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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.
post #7 of 17 (permalink) Old 10-16-2007, 03:42 PM
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Originally Posted by cursedtofirst45
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 morning

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post #8 of 17 (permalink) Old 10-16-2007, 11:13 PM Thread Starter
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if it is the ebpv, why does it seem to go away temporarily when i push the clutch in

Eric

1994 Dodge Ram 2500

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post #9 of 17 (permalink) Old 10-16-2007, 11:19 PM
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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.
post #10 of 17 (permalink) Old 10-16-2007, 11:25 PM
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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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