EBPV Deleted so now what the hell?!

[andyw8705]

Ok so the truck finally quit on me after a few months of running funny. The main issue was that upon startup, the damn CEL would come on and it would be slow to accelerate then it would shift really hard. Well after a few minutes, sometimes maybe even 30 sec, the light would go off and everything would be ok other than it would occasionally die when at a stop light. Well it finally got to the point where there was no power at all and it would creep about 5 mph.

So i replaced some leaking fuel lines, burnt connector on valve cover, got new sleeves and clamps for intercooler piping, new turbo, and non ebpv pedestal. Well the truck runs a lot better but still has the CEL on upon start up, accelerates slow, and shifts hard.

My question is what could be causing this to happen if the EBPV is gone? I have read several different ways to get rid of the code but it seems to me that when I did the EBPV all I should get is a soft code. Seems like if I plugged the tube it would be the same as it being clogged up so I dunno. Anybody have any thoughts? What is involved in a proper EBPV delete using a non EBPV pedestal as opposed to just gutting the EBPV?

[BigFuel]

What codes are you getting? You state that you replaced the pedestal but what did you do to the Butterfly valve post turbine?

[andyw8705]

p0470 and i think the other one might have been p0478 but i cant remember. i got the high flow blank outlet from diesel orings

[BigFuel]

Do you still have the cat in the exhaust system?

My truck needed this to run correctly:
DFUSER Diesel Performance Products Exhaust High Performance Part Diesel Intake Diesel Power Chips

Pull your exhaust pressure sender and the tube off the truck and see if it needs to be cleaned (sender behind and a little lower than the oil pressure sender in the valley). Be careful cleaning the inside of the sender as not to rip/damage the diaphragm inside.

[andyw8705]

nope no cat, straight back. i guess i am confused because i have heard of people plugging the exhaust pressure sender when they install a non ebpv pedestal but it would make sense that plugging it up would be the same as it being dirty so are they wrong in doing this because if they are correct in doing so it seems like cleaning it would serve no benefit???

[andyw8705]

srry if that sounds dumb im new to PSD's and your help is greatly appreciated btw

[BigFuel]

The exhaust pressure sender is in the front of the motor. It tells the PCM how much back pressure is building in the manifolds before the turbo. If the EBPS tubing is plugged up then the PCM would see no backpressure and freak out that there was something wrong with the turbo and cuts fuel out of the motor to try and save it. If the wiring to the EBPS has shorted across itself then the PCM would freak out that there was SO much pressure pre-turbo that it would cut fuel out to try and save the motor. Either way it is the same result. The PCM cuts fuel to the motor causing low MPGs (because the turbo can't spool) and poor performance (um, there's no fuel being delivered to the cylinder). The plug that I linked above goes on the wiring that used to connect to the EBPV under the turbo. On my '97 the PCM monitors the position of the butterfly blade and this plug has a resistor built into it to fool the PCM.

[BigFuel]

There is no dumb questions here. Ask the question and get an answer.

Hmm, I'm thinking that you are combining the exhaust back pressure valve (EBPV) and the exhaust back pressure sending (EBPS) unit as the same thing. These are different sides of the motor and work in tandem with each other and the MAP sensor on the firewall.

[andyw8705]

that is exactly what i was doing thank you

[BigFuel]

No worries. Here is a vid on how to do this on a Super Duty. Almost the same thing as ours but the sender is in a slightly different spot.

How to: Improve MPG on 7.3L Powerstroke - Cleaning EBPS - YouTube