Good or Bad sound??? - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 01-31-2007, 03:12 PM Thread Starter
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Good or Bad sound???

I just put a 5" stack kit on my 97 F350 PSD. I have a question. I'm hearing a really loud whooshing sound when I'm driving at a constant speed. If I accelerate/decelerate(let off the throttle) it goes away. It almost sounds like there is air sucking back through the exhaust. Kinda worried this might be a bad thing. Bad back pressure or something??? Good? Bad? Ok?
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post #2 of 17 Old 01-31-2007, 03:15 PM Thread Starter
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Apologize for the stupid ignorance... lol First time diesel! Long time Ford truck owner!
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post #3 of 17 Old 01-31-2007, 03:17 PM
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No stupid ignorance

thats what we are here for. I dont have any experience with the stack kits but when someone answers it we will both learn. I would like to see a pic though. welcome to the site.
post #4 of 17 Old 01-31-2007, 04:11 PM Thread Starter
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I drove the truck with the exhaust cut off for 1 day before I had time to put this stack kit on. It did the sound then too.
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post #5 of 17 Old 01-31-2007, 04:14 PM
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I would bet

its normal.
post #6 of 17 Old 01-31-2007, 06:59 PM
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exhaust backpressure valve It comes on when the truck is cold, and kina maes the truck feel sluggish, it supposedly warms the truck sooner when temperatures drop. Does it ever stop or will it do it all day? I gutted my EBV about 20K ago and didn't notice it taking any longer to get up to temp. Do you have any of those symptoms??? Tough to say exactly what it is when you can't hear it.

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post #7 of 17 Old 02-01-2007, 02:32 AM Thread Starter
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Could be? The sound is a really loud sucking sound.
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post #8 of 17 Old 02-01-2007, 04:37 PM Thread Starter
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I think your right Stroked... when I went to work this morning after 15mins of warm up... it was doing it, and when I went home (8 hours later) but after I came home... I kept going to and from class. And after awhile it didnt do it anymore. Even after I left the truck sit for an hour. Who knows? lol as soon as I wake up tomorrow at 6, I'm going go down and start the truck, and then when I leave, usually around 6:35-40 I'll see if it does having warmed up for so long. Thanks for your input!
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post #9 of 17 Old 02-01-2007, 04:45 PM
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That sounds exactly like your EBPV.


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post #10 of 17 Old 02-01-2007, 05:34 PM Thread Starter
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lol now this might be silly coming from a mechanical engineering student... I know everything is made for a reason, and that valve is there for a reason, but neway to shut it off?
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