Hissing when cold - Ford Powerstroke Diesel Forum
 
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post #1 of 10 Old 11-18-2006, 12:42 PM Thread Starter
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Hissing when cold

My engine is making a strange hiss when its cold (even after I let it warm up for 10 min) It seems to lose power as well, but if I get on the throttle it goes away. If I let up it starts again. It goes away after about 5-6 miles of driving.

Any help would be great!!
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post #2 of 10 Old 11-18-2006, 01:01 PM
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Possible Exhaust leak that can effect turbo performance, but when the motor warms up and the metal expands the leak is minimzed and the sound dissapates and power is restored. This is my guess , I have exp this type of thing before.
I recently pulled my 7.3L PSD for a rebuild and my mech and I found an exhaust leak which was coming from the exhaust tubes that feed the drive side of the turbo. We noticed carbon depositis around the pipe and flange. This indicated a possible leak of exhaust gas pre turbo.
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post #3 of 10 Old 11-18-2006, 02:00 PM
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no fear.

its your Exhaust Back Pressure Valve (EBPV). And it sounds like it is working properly. It closes off some exhaust, puts a load on the motor, and help the diesel warm up.

sounds like all is well, but if you want to conduct a test to make sure, read this thread...

Turbo Surge

someone goes into detail about how to disconnect the ebpv. it the sound goes away then i was right...LOL

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post #4 of 10 Old 11-18-2006, 04:54 PM
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agree with law man hiss is normal when cold the colder the more hiss you should hear it with out a mufler sounds like a jet. cool
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post #5 of 10 Old 11-18-2006, 05:00 PM
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Word!!!

I thought it was a vaccum leak at first, but then I realized I still have my EBPV connected and then took note of the cold. 1+1=EBPV!!!


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post #6 of 10 Old 11-18-2006, 06:52 PM
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In cold weather mine sounds like a mosquito sprayer until I touch the brakes.

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post #7 of 10 Old 08-20-2007, 09:37 PM
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Not to thread steal but im having a similar prob with my truck, BUT, it dos it with the key in the run position BEFORE i even start the truck. searched the forums for 2 days with all types of (blank) leaks and have found nothing. Any ideas guys
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post #8 of 10 Old 08-21-2007, 03:26 AM
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it could be the vacuum pump if its doin it before you start the truck. does it sound like its coming from the passenger side fender area

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post #9 of 10 Old 08-21-2007, 01:05 PM
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99.5, the hissing sound could be the vacuum pump, or you could be hearing fuel and air being pushed through the filter bowl and pressure regulator.
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post #10 of 10 Old 09-02-2007, 12:07 PM
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Yeah, i ruled out the vacuum pump.

It is comin from the filter housing area....any common areas on this thing that i could start looking at. It squeals sometimes and other times i can just hear a leak of some sort. NO large fuel leaks. Could an air leak cause my truck to run hotter (egt's)? It makes the sound until i crack open the yellow drain thingy and let alittle fuel run out. Like my technical descriptions?

Any ideas guys???
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