Turbo Hiss
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Senior User
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From: Erin, Tn.
Turbo Hiss
Hey guys
I have a 97 F350 with 190000 miles. The last 2 winters I have noticed this problem but this year is worse than ever. When you first start the truck there is a valve or something under the turbo pipe at the back of the engine that opens and closes. When it is poen you hear air escaping ( Hissing ). When it is real cold this same sound happens while driving not under a pull but in an almost coasting situation. At this point you lose all power untill you give it more fuel, then it closes and you regain power.
What the heck is doing this and how do I fix it?
Thanks
I have a 97 F350 with 190000 miles. The last 2 winters I have noticed this problem but this year is worse than ever. When you first start the truck there is a valve or something under the turbo pipe at the back of the engine that opens and closes. When it is poen you hear air escaping ( Hissing ). When it is real cold this same sound happens while driving not under a pull but in an almost coasting situation. At this point you lose all power untill you give it more fuel, then it closes and you regain power.
What the heck is doing this and how do I fix it?
Thanks
Elder User
Joined: Jan 2006
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thats totally normal, its your exhaust back pressure valve (ebpv) operating. it will close when coasting and up until a certain point on the throttle until the truck comes up to temperature. it can be safely disconnected with little effect on the trucks warming up by disconnecting a 2 prong pin underneed the (i believe) intake side of the turbo. im sure someone can chime in with a more precise location for this.
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From: Erin, Tn.
Thanks, it's about time I was normal at something. It just seems like I lose alot of power when it does this. Almost to the point of being dangerous because it falls on its face so hard ( Kind of like a Jake Brake ). If I disconnect this rod is there anything else that it could affect? And are there any advantages to disconnecting it?
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Joined: Jan 2006
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ya, it takes a good bit of getting used to driving with it on. someone will chime in eventually with a mod to disconnect it, i believe its just a simple connection that has to be pulled. the only thing it does is help the truck warm up faster, but ive read that the difference in warm up time between connected and disconnected is minimal at best. i still leave mine connected just because i can throttle it just right that when im driving by somewhere and want to make some noise i let off of it at the right time and with the straight pipe it sounds friggen awesome!
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From: Erin, Tn.
OK I can see where and how it can work but I have noticed sense I first posted that I may have led you astray. When I first start I drive 25 miles to work and stop at a store. When I RESTART is when it acts stupid. It is warmed up already and should be normal but it loses power and hisses all the rest of the way to work ( 3 miles ).Is that normal?????
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Joined: Oct 2005
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From: West Palm Beach, Florida
Wait until the beast is very cold and reach under the turbo and disconnect the electrical connection and you will never hear it again. You really don't need it. It is acting up on you and so take it out of the equation by unplugging it when it is cold and in the fully open position. It will just stay in that position and never give you any trouble again.
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From: Louisville
I did find a bit of a downside to unplugging the EBPV. When leaving the truck running at idle for an extended time the engine temp went down! In about 30 min it dropped from the center of the gauge to near the 'N'
I'd still recommend unplugging it...
I'd still recommend unplugging it...
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From: Erin, Tn.
OK I unplugged a 2 wire plug under the air intake hose going to the Turbo. I started the truck and didn't here that hiss like I did. We will see in the morning but I think you got me on the right track.
Thanks to everyone.
Thanks to everyone.
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Should the EBPV be unplugged when cold or hot? If it's purpose is to assist in warming the engine, it'll be closed when cold. If it's unplugged when cold, will it stay in the closed position of will the exhaust gas pressure force it open? If it does force it open will it stay open or is it actuated to be normally closed?
Don't mean to hijack the thread, simply trying to get all the details. Thanks.
Don't mean to hijack the thread, simply trying to get all the details. Thanks.
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Joined: Dec 2005
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Originally Posted by headleyj
Should the EBPV be unplugged when cold or hot? If it's purpose is to assist in warming the engine, it'll be closed when cold. If it's unplugged when cold, will it stay in the closed position of will the exhaust gas pressure force it open? If it does force it open will it stay open or is it actuated to be normally closed?
Don't mean to hijack the thread, simply trying to get all the details. Thanks.
Don't mean to hijack the thread, simply trying to get all the details. Thanks.
It dont matter if its unplugged when its hot or cold, it normally stays open until the computer tells it to close, you unplug the actuater(lack of better terminology) and it will open under spring tention and then thiers nothing to override this spring so you will be fine.
For my take, pending how cold it is outside, I can do a 45mile run on the highway and the engine will be fine, hit the city and then EBPV will start to work again cause of the cool down. Anyways, I leave mine hooked up cause I start the truck, idle it up after 5 minutes of running at idle and leave it run at 1300rpms until the EBPV opens. Takes about 10-15 minutes to warm up to temp if I'm using my 1500watt circulating heater.
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From: Quesnel, BC, Canada
you can run a power source and ground to the turbo side of the plug with a switch on the dash wired in on the (+) side. Turn the swtich on and you have an exhaust brake. If you get fancy you can splice a relay into the brake light wire, when the brake light is turned on the current will close the relay and send power to the EBPV and close it off.