Questions about Exhaust Back Pressure Valve EBPV - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 04-04-2006, 08:10 PM   #1 (permalink)
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Questions about Exhaust Back Pressure Valve EBPV

Is the EBPV the valve at the back of my 99 7.3 turbo?

For over 60k miles I have been having a problem with a lurching, shuddering when the engine water temp has almost reached operating temp. Numerous shops have looked at it & verified the problem. There are no trouble codes.
Injectors have been tested, wiring replaced, injector controller replaced, oil changed, fuel pressure checked, fuel filters replaced, copmputer replaced, sensors tested & more
The problem happens at any air temp, but is more noticeable below 40 degrees. The problem happens under light throttle & will continue if throttle is held or stop if backing off the throttle.

What position should the EBPV be in at operating temp? Should it be in the same position as when the truck is not running?

It was recently suggested by an International mechanic to wire the EBPV open & see if the problem happens. Since the valve at the back of the turbo is vacuum operated, wired would mean to physically wire the gate open. Would I need to wire it opposite of the position when the truck is off?

What if I disconnect the red hose would that keep the valve open or closed?

Any discussion, explanation or description of the EBPV system would be appreciated.

Thanks
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99 Ford Superduty Powerstroke, Royal Sport Lockbody, guages trans temp/exhaust temp/boost, Amsoil dual bypass oil filter & synthetic, US Gear exhaust brake, Suncoast on-board air system, Rear air bag kit w auto level system
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Old 04-04-2006, 10:08 PM   #2 (permalink)
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Re: Questions about Exhaust Back Pressure Valve EBPV

The EBPV(Exhaust Back Pressure Valve) is the butterfly valve on the down pipe side of the turbo exhuast housing. It is operated by oil pressure, so with the motor shut-off it should be open. The PCM opens/closes it to help warm the enigne. I have never heard of someone wiring it open, but you could unplug the connector at the base of the pedestal to disable it.

Is the red hose you are talking about plugged into a little cannister that is bolted to the compressor housing? If so it is for the waste gate, which is controlled by boost pressure not vacuum. This I have heard of people wiring closed, it should be closed when the motor is off and until you reach a certain level of boost. Disconnecting the red line should keep the waste gate closed.

To me, neither one of these sound like your problem. I have unhooked my wastegate, and I have had a sticky EBPV before and neither one caused a lurching or shuddering. Do you notice high egts and/or low boost when it happens? If you hold the light throttle does it continue to do it as you pick up speed? If you give it more throttle does it go away? Does it go away after it is up to temperature? It doesn't happen to do it at a certain speed does it(35-40mph)?
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Old 04-05-2006, 10:14 AM   #3 (permalink)
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Re: Questions about Exhaust Back Pressure Valve EBPV

Had similar problem, what i found was the EBV tube had a hole in it.
Rusted through, but it can't be seen unless you remove the tube. the tube goes from exhaust manifold to the sensor. tube part# 1C3Z 9D477AA
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Old 04-06-2006, 07:36 AM   #4 (permalink)
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Re: Questions about Exhaust Back Pressure Valve EBPV

[ QUOTE ]
Is the EBPV the valve at the back of my 99 7.3 turbo?

For over 60k miles I have been having a problem with a lurching, shuddering when the engine water temp has almost reached operating temp. Numerous shops have looked at it & verified the problem. There are no trouble codes.
...

What position should the EBPV be in at operating temp? Should it be in the same position as when the truck is not running?

It was recently suggested by an International mechanic to wire the EBPV open & see if the problem happens. Since the valve at the back of the turbo is vacuum operated, wired would mean to physically wire the gate open. Would I need to wire it opposite of the position when the truck is off?

What if I disconnect the red hose would that keep the valve open or closed?

Any discussion, explanation or description of the EBPV system would be appreciated.

Thanks

[/ QUOTE ]

The cable to the lever which turns the butterfly
open/closed on the EBPV is on the underside of the turbo. YOu
can see it better or access it better from the passenger side. It's
also more easily accessed if you remove the upper rubber hose on
the passenger side of the intercooler tubes. And prop that
aluminum tube up out of the way. Mine needed cleaning and
tightening anyway.
I just had a problem with similar symptoms, my truck
was also hard to start. My issue happened after my
EBPV sensor and the little tube going to it were replaced,
not sure if it was the mechanics fault or just bad luck, but
that cable can come off the EBPV vale. Truck ran great
for about a week, then...it ran worse than before. When
this cable came off, my EBPV valve
was flapping and I guess got stuck closed...arg..
I was searching this forum for ways to disconnect the
whole thing, etc...Then I found my cable was off...whoops..
That cable is spring loaded to the open position. Which
is with the cable shortest or I guess you
could say the lever to the valve turned towards the drivers
side of the truck, if that helps. I read on here,
(do a search, alot of good links) that when
the truck first starts the EBPV sensor causes the cable to
push the valve or lever, closing off the exhaust.
In my case, since it was no longer connected the Valve was free
to go to any position. Don't know if this could be
your problem, but take a look at the cable/lever to
make sure it's connected. You can also just push
the lever/valve to see if it moves or see
what position it is in.

Wally
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As of May 1, 2006, this is what I have:
94' F250, ext cab, 4x4, Factory IDI turbo, TRANS command, K&N Air filter, straight pipe, rebuilt E40D, 179k miles (E40D died again..)

2000 F550, PSD, 4.88 rear, 4x4, auto, crew cab, centurian bed. 146k miles,
Update on 17 Nov, 2005, added Edge Evolution,
Put muffler delete pipe on in April, 2006, need to
install my gauges next.

Some F550 pics:
http://www.members.dca.net/wally/f550/

I pull a 40' 1994 Hart gooseneck horsetrailer, still have both trucks. Use the 94' IDI as
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Old 04-06-2006, 01:19 PM   #5 (permalink)
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Re: Questions about Exhaust Back Pressure Valve EBPV

Thanks for all your info suggestions. I was thinking the wastegate was the EBPV valve. Thanks for setting me straight.

First I checked that the EBPV valve operated by starting the cold truck & seeing the valve arm move towards the passenger side. Then I disconnected the connector to the EBPV valve under the turbo & went for a test ride. The truck did not lurch or shudder as it normally has. I want to test it again tomorrow morning when cold, but it looks hopeful that the problem has been isolated.

If the EBPV valve being closed is causing the shudder & lurch during warm up, then why? The EBPV valve is supposed to close when cold. What needs to be corrected?

Tiny-Turbo mentioned
"Had similar problem, what i found was the EBV tube had a hole in it.
Rusted through, but it can't be seen unless you remove the tube. the tube goes from exhaust manifold to the sensor. tube part# 1C3Z 9D477AA"

Do you EBPV or EBV? Where is the EBV tube located & where is the sensor located?
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Old 04-06-2006, 03:02 PM   #6 (permalink)
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Re: Questions about Exhaust Back Pressure Valve EBPV

I think that sensor does some other stuff too. Computer wise.
Which is why some of the posts had said not to
just disconnect it. Other folks said no problem...But, I'm no expert in the area. I think they were disconnecting it near the turbo though
or EBPV base/housing.
There was some talk in other posts of a bypass sensor/device you
can buy from an aftermarket vendor
which would eliminate any codes it might generate.
I paid the $400+ to have someone change it
and the tube from it to somewhere...Now I think
I could have done that myself..Oh well, live and learn.

Good luck! Let us know what you find out.

Wally
__________________
As of May 1, 2006, this is what I have:
94' F250, ext cab, 4x4, Factory IDI turbo, TRANS command, K&N Air filter, straight pipe, rebuilt E40D, 179k miles (E40D died again..)

2000 F550, PSD, 4.88 rear, 4x4, auto, crew cab, centurian bed. 146k miles,
Update on 17 Nov, 2005, added Edge Evolution,
Put muffler delete pipe on in April, 2006, need to
install my gauges next.

Some F550 pics:
http://www.members.dca.net/wally/f550/

I pull a 40' 1994 Hart gooseneck horsetrailer, still have both trucks. Use the 94' IDI as
my daily driver.
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Old 04-07-2006, 01:16 PM   #7 (permalink)
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Re: Questions about Exhaust Back Pressure Valve EBPV

Road tested truck this morning at 40 degrees with EBPV valve elec connector unplugged. The lurching & shuddering did not occur until the truck was in over drive & was far less severe than before. It normally occurs in drive as well as overdrive. The problem occured just before the water temp reached operating temp & went away once at operating temp.

Any thoughts on what is causing this?

What size & type of socket do I need for the external star bolts on the turbo?

Thanks
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99 Ford Superduty Powerstroke, Royal Sport Lockbody, guages trans temp/exhaust temp/boost, Amsoil dual bypass oil filter & synthetic, US Gear exhaust brake, Suncoast on-board air system, Rear air bag kit w auto level system
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