Hissing - Ford Powerstroke Diesel Forum
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Old 11-28-2013, 04:22 PM
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Hissing

I cranked my truck this morning I think it was around 30 or so (I never had this problem happen to my before) and let it sit for about 10 mins and let it warm up. I took off and as my rpms climbed up slowly I heard a hiss, speed didn't matter unless I was speeding up quickly it wouldn't do it. But if I slowly let off the throttle the hiss would start and stay there until it wasn't getting any gas. This is the first time it's happened to me but then again this is the coldest I've drove it in, im in Texas by the way. I stopped and revved it a little and did it slowly and the hiss was there when I started letting it rev back down slow. I'm not sure if there is any information that you need that I forgot to mention or anything like that. I'm half scared it's my turbo because when it hiss's it feels like there is a little loss of power. I've read a little and maybe it might be the exhaust back pressure valve but I really don't know. This all happened to me earlier today, and about 3 hours ago I drove it back to my house after having left it at my uncles, it was 55 degrees now so it warmed up quite a bit, and well, all my problems were gone. No hiss, nothing. Just good old sound I love of the engine. So, what do you guys think? The back pressure valve, or what? If it is would you guys minding sending me the link of how you clean it or anything like that?
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Old 11-28-2013, 04:31 PM
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its the ebpv. no worries man. just making the truck warm up faster. you can either unplug it, delete it, or leave it.
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Old 11-28-2013, 04:38 PM
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Quote:
Originally Posted by Colin7.3 View Post
its the ebpv. no worries man. just making the truck warm up faster. you can either unplug it, delete it, or leave it.
That is so good to hear, after $1200 put in on repairs on everything fuel related in the engine except for injectors it was a bad feeling thinking turbo might be going. Is it just going to make that noise if I leave it be when it's in the lower-mid 30's, also leaving it alone and just ignoring the hiss won't hurt anything will it?
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Old 11-28-2013, 04:41 PM
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yep its just gonna make the noise when its cold. it wont hurt anyhting. the purpose of it is to create a ton of back pressure and make the engine work harder and that creates heat and warms the engine up faster.
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Old 11-28-2013, 04:45 PM
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Quote:
Originally Posted by Colin7.3 View Post
yep its just gonna make the noise when its cold. it wont hurt anyhting. the purpose of it is to create a ton of back pressure and make the engine work harder and that creates heat and warms the engine up faster.
How long do you think it'd take for the truck to warm up completely? I let it warm up for around 10 minutes every time I crank it when its below 45 or so. Is that not long enough where it being as cold as it was earlier and the valve kicked in? Also thank you so much that takes a big load off my mind!
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Old 11-28-2013, 04:53 PM
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Winter!!! What to Expect From Your Truck.

this is a good read for us 7.3 guys
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Old 11-28-2013, 04:57 PM
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Alrighty, thanks again!!
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Old 12-13-2013, 07:25 PM
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I ended up unplugging mine. It seems to never warm up in the winter. I cant stand that sound. Although I put 203 thermostat in the truck tonight so im hoping it runs a little warmer now.
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Old 12-13-2013, 07:31 PM
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How much do those thermostats run? I think mine might be stuck open because the truck runs real cold even in summer. Heater will warm up and get hot but takes it a while
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Old 12-13-2013, 07:45 PM
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It was like $40. Desielsite.com. super easy. Took about 20 minutes
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