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1994.5 - 1997 7.3L Power Stroke Diesel  

butterfly valve when coasting?

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Old Jan 9, 2013 | 09:17 PM
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butterfly valve when coasting?

Hi guys, got an old wreck of a 96 F-350 with the powerstroke in it. I'm having issues with the butterfly valve inside the turbo closing when I'm not into the throttle pretty good. As soon as you let off it closes up, but get into the throttle again and it opens. This isn't my first gen 1 powerstroke, but I can't figure this one out. Ideas?
 
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Old Jan 9, 2013 | 09:22 PM
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Does it do it Hot and cold?
 
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Old Jan 9, 2013 | 09:27 PM
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Almost all of the time. When its cold It is the worst, sometimes it goes away wjen the truck Is all warmed up, and othe times it doesn't go away. Has me condused.
 
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Old Jan 9, 2013 | 09:36 PM
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Is the truck an auto?

Sounds to me like the oil temp sensor is bad and the truck thinks its cold. The back pressure sensor could be bad as well or the tube is just severely plugged.

Diesel Rod
 
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Old Jan 9, 2013 | 09:39 PM
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Yes the truck is an auto. Where are those sensors located?
 
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Old Jan 9, 2013 | 09:40 PM
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Unpluging it is an option, you don't need it mine is totally gone. Took it out when I rebuilt the turbo. You say it is kind of a Pile anyway so you probably don't want to spend much fixing it??
 
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Old Jan 9, 2013 | 09:43 PM
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Paid 1200$ for it. Not bad for a 4x4 F350 dsl I don't think, but the body is rough for sure. Its just a beater farm truck/ winter truck. I put my nice F350 away for the winter. I would be totally up for disconnecting It. Wasn't aware that it was a viable option. How would I go about doing this?
 
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Old Jan 9, 2013 | 09:49 PM
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Look at the turbo, where the intake connects (drivers side) on the bottom side of the housing will be a plug. Unplug it.
 
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Old Jan 9, 2013 | 09:52 PM
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Awesome, I will do that. I was hoping for a simple option like this. I'm used to IDI engines, no electronic issues. Lol. Thank you for your help, it is much appreciated.
 
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Old Jan 9, 2013 | 10:02 PM
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No prob. glad to help. Who cares on an old farm truck don't need it anyhow. Make sure its in the open position after its unplugged should be spring loaded to open but can stick. it's located where the exhaust comes out of the turbo.
 
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Old Jan 10, 2013 | 10:28 AM
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You can put it on a switch if you like. Then you can use it when you need it. But honestly it is not really necessary.
If it still closes when you unplug the electrical connection you can wire it open at the linkage.
 
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Old Jan 10, 2013 | 12:26 PM
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I actually just unplugged mine right before I put my intake back on last night. No more annoying hissing noise and lost power, thank God.
 
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Old Jan 10, 2013 | 08:52 PM
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I unplugged the connection today, and it is now working perfect. Thank you to all for your input and wealth of knowledge!
 
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Old Jan 10, 2013 | 08:59 PM
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Anytime!!!! Glad to hear its workin, now you can go give it a little farm abuse just for good measure so it still feels at home!!!
 
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