7.3 Turbo Problem
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7.3 Turbo Problem
I have a 1997 7.3 turbo power stroke. i just put a lift and all on it, and i put a straight pipe on it. I cut off the muffler and then cut off the resinator or cat or whatever is in front of the muffler. I then welded a extendion pipe so the exhaust exits between the cab and the rear tires. It worked good however sometimes during steady cruising where the motor isnt pushing the truck a "shhhhhhhhh" sounds comes out of the exhaust and the rpm decreases a few hundred rpm and it does the same thing during decceleration however when you accelerate it goes away. It does not have the problem all the time. Sometimes when I fire it up and drive it doesnt do it. I'm almost sure its something with the turbo perhaps back pressure or something. Any help on this problem would be greatly appreciated. Thanks
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From: Kearney, Nebr
I'm thinking that when your going down the hill you let off the accerator and the engine brakes. The "shhhh" sounds does appear to be the turbo. The reason could be because the engine is not working hard (means less knocking) and you can hear that turbo. On my 96' when you back off on the fuel the rpms go down because of the engine braking. Dont hear the turbo as much since it has stock exhaust. That straight pipe sound pretty good?
Just my opinnion....
____________________
90' F150 Longbox xlt Lariat 4x4 302 4-speed w/ 4.10 rear
Headers/true duals 2.25" w/ 28" glasspacks coming out at 45's
The FARM TRUCK
96' F250 7.3L Powerstroke xlt Longbox w/gooseneck hitch
5-speed w/Jake Brake 4x4 w/4.10 rear
Just my opinnion....
____________________
90' F150 Longbox xlt Lariat 4x4 302 4-speed w/ 4.10 rear
Headers/true duals 2.25" w/ 28" glasspacks coming out at 45's
The FARM TRUCK
96' F250 7.3L Powerstroke xlt Longbox w/gooseneck hitch
5-speed w/Jake Brake 4x4 w/4.10 rear
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Joined: Apr 2003
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From: Northern IL
What you are hearing is your exhaust back pressure valve (EBPV). It will come on and off trying to help warm the engine up. The times you say you hear it are normal operating times for the EBPV.
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The exhaust sounds straight up awesome. I cut off the muffler and resenator/cat? and the turbo is a bad sounding.
About the EBPV, is there anything that I can do to resolve it. If I am driving down the road that sounds kicks up and you can feel engine power loss. It does it even if it is warm. Before this exhaust change it never did this.
About the EBPV, is there anything that I can do to resolve it. If I am driving down the road that sounds kicks up and you can feel engine power loss. It does it even if it is warm. Before this exhaust change it never did this.
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Joined: Apr 2003
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From: Northern IL
You can go about it two ways.
1. unplug the EBPV actuator. It is the two wire plug under the compressor housing, right under the air intake.
2. You could check out all the sensors. Clean out the back pressure sensor tube. And see if you can get the system to work better.
I am currently trying to do option #2 on my truck. But it is still not working correctly. My EBPV is working way too much even when the engine is hot. I am about to just go and unplug it.
1. unplug the EBPV actuator. It is the two wire plug under the compressor housing, right under the air intake.
2. You could check out all the sensors. Clean out the back pressure sensor tube. And see if you can get the system to work better.
I am currently trying to do option #2 on my truck. But it is still not working correctly. My EBPV is working way too much even when the engine is hot. I am about to just go and unplug it.
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Joined: Apr 2003
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From: Northern IL
Its purpose is to help warm up. You should see no problems by unplugging it. The EBPV will not function at all. The people I know who have done this noticed no difference in warm up time. I use mine as a exhaust brake so thats why I tried to keep it in working condition.
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