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Engine rebuilt about 18 mo ago and has about 15k on new engine
Hi folks,
Like to start by saying thank you.
Been reading this forum for years and learned an awful lot,
So of course my first post would have to be a difficult one. Been beating my brains out trying to resolve this issue and finally have got to the point of seeking outside help.
Truck has a low power type issue from about 1500 to 2200 rpm
Roughly 35 to 50 mph on acceleration. Feels like a flutter ( hesitation?)
If I romp hard on it past that it will clear up and run great.
No real smoking condition other than a small amount of black when really romping on it.
Getting a P0476 code: exhaust back pressure control valve performance
Mods on truck:
F6 tuner from DP
Stage 1 reman single shot injectors from riffraff ( full force)
4” Exhaust and Pyro gauges
6637 Air filter
Riffraff billet turbo wheel.
Ebpv has been deleted, with riffraff pedestal and housing.
The EBP solenoid is plugged in and zip tied in the engine compartment.
All testing and diagnostics have been done with the programmer in modified stock setting 1.
Steps taken so far…..
Replaced EBP sensor cleaned hose going to the manifold
As I stated above the EBPV has been deleted.
Wired wastegate shut temporarily to rule out the wastegate.
Compression test (engine was cold) 360psi on all cylinders except #3 which had 340psi
Replaced both UVCH gaskets with OEM replacements
Checked wiring at IDM and 42 pin connector all good
Swapped IDM’s
New Bosch fuel pump
New fuel filter
Dropped fuel tank and cleaned mixing filters
Getting consistent 60psi at WOT under load ( at the fuel bowl)
Tested for leaks in intake and intercooler
Up pipes replaced with engine, no signs of black soot around exhaust connections.
Removed the turbo to check for anything weird , no or very little play, fins look good
PCM not showing any other signs of malfunctioning.
It seems that I am not building boost for some reason.
I have recorded a log containing Manifold gauge pressure, EBP, etc. it is on a .csv file attached, Hope its readable as I am fairly new to AE
Any thoughts would be greatly appreciated getting to the end of my rope on this problem.
Here's a cleaned up csv of the data log below. Go to town FTE log gurus!
First thought is the batteries are weak or the alt or cables are weak/corroded. Not addressing the underlying issue, but it's a thing. If healthy it should do 14.3v or so.
Thanks David,
Truck has been on a charger since that log.
I think all of the various diagnostics I was doing drained them a bit.
They are fairly new ( under a year old)
I will keep an eye on that PID though.
A half point between the 3 is good, all sensors up to snuff.
If the EBPV is removed you need a resistor to fool the PCM into thinking the solenoid is doing as instructed. I think that just avoids throwing a code, not sure if the PCM does more with the info.
Well... EBP. I did not notice EBP in your log. It could show ambient psi fine but not respond dynamically, and that will affect the PCMs fueling. Please log or watch that PID. If it's changing it's prolly good.
20 years ago I pal'ed around for a bit with the International/Ford service trainer for the western US. I was at his house one day and on the dining room he had demonstration cutaways of the then new 17 degree HPOP. Died in the wool 7.3L. He knew it inside, outside, upside downside. His job was to go from dealership to dealership to train the master diesel service techs on the 7.3L engine. He was the factory representative for that motor. Have I emphasized enough that this guy (his name was Don, Diesel Don) long since retired, knew what he was talking about? He was the horse, and his mouth is what Ford diesel techs listened to.
So one day I'm at his house, and I had just picked up my 2000, hadn't had it more than a couple of months, and for grins we hook up his scan tool. Only one code. P0476.
He said, "Don't worry about that one. It always shows up."
I still have a fully functional EBPV valve. No guttting. No chip. No tune. No resistor. Plus, I have a new EBP sensor, and a new EBP tube. Plus I created a cleaning tool (out of a speedometer cable) to clean the tube periodically without removal.
And to this day, 20 years later, I can hook up my NGS, and still pull up P0476.
I'm not saying you shouldn't worry, but I am saying that Don said not to worry, and I haven't worried either.
David, I have attached 2 new files , the one titled July 25th has EBP pid added to it. The one titled July 24th B Has all Pids
What is glaringly obvious is lack of EBP DC PID numbers, They are all zero's Not sure why I did not Notice that before. I am not sure what sensor generates this pid I have replaced the EBP sensor
And it is reading in PSI
Y2KW57 , I agree with your friend and would probably ignore it if not for the fact that it is the only code I have and in my head could be why the truck feels like it is defueling.
It may at the end of the day have nothing to do with it.
Ok, So if I am not mistaken ( and I may well be) the sensor that relays EPB Duty Cycle to the PCM is the EBP Solenoid
As I stated in original post my EBPV has been deleted and I zip tied the solenoid in the engine bay.
The truck has run well for a year since the delete but perhaps that solenoid has gone bad?
At any rate I have read that a resistor in its place will give the PCM the reading it wants to see.
I purchased these resistors ( see picture ) and placed one of them in leau of the solenoid and instantly got a code. I removed the resistor and replaced the solenoid and the code went away.
My question is , is this the right resistor? and what is the trick to making it work?
Which answers the question I had about EBP Duty Cycles .
So if I understand correctly, when the PCM see's that the IAT sensor (Intake Air Temperature sensor) Reads Below 10°C (50°F) and the EOT sensor (Engine Oil Temperature sensor ) Reads Below 70°C (158°F) PCM sends a duty cycle signal to a solenoid which controls oil flow from the turbo pedestal. This causes a servo to close a valve at the turbo exhaust outlet ( EBPV )
Hence the reason for all zero's on the EBP Duty Cycle PID on my PID Log. My IAT read higher than 50deg and my EOT showed above 158 deg
What is still a bit hazy in my mind is if the pcm will defuel if it does not get the signal it is looking for from the EBPV solenoid. In other words, say If my EBPV solenoid which is zip tied in the engine bay because of me deleting the EBPV has gone bad , would the PCM defuel? The truck has ran fine with the solenoid in this manner for a year. I guess when the new 470 ohm resisters arrive and my injectors return I will find out.
Just a reminder that my EBPV is fully functional, and every winter I can hear it doing it's job. For the last two decades. During all of which time I have pulled, cleared, and eventually pulled again the P0476 code that you appear to be blaming on a non functional EBPV. Mine is functional, and I still get this code. Just in case that wasn't clear.
Just a reminder than my EBPV is fully functional, and every winter I can hear it doing it's job. For the last two decades. During all of which time I have pulled, cleared, and eventually pulled again the P0476 code that you appear to be blaming on a non functional EBPV. Mine is functional, and I still get this code. Just in case that wasn't clear.
No I get it, and just like the rom error code I get because I have the DP tuner installed I would ignore it as well if not for the fact that my truck runs like crap and I am having trouble figuring out why.
And I get that you are trying to resolve a driveabillty problem, but blaming P0476, especially at the level of expense as scheduled below, might be likened to blaming faded paint.
Schedule of Expenses:
"So my go forward plan seeing as I am not getting much input is:"
- Send my injectors to Full force to be flow tested
The biggest question I have is, did your Ex ever not "run like crap" in the 35-50 mph window you complained about?
If so, then what was the last change made prior to it beginning to "run like crap"? Were there a whole bunch of changes (mods) done at one time? Has the motor had issues in the 35-50 mph range ever since it was "set up" with all the mods? Or did it run right for a while in the modified configuration, and then suddenly present this problem seemingly out of the blue? Or has the problem appeared gradually, innocuously at first, but eventually with increasing frequency or amplitude in stumble?
Other questions: have you checked the F6 card insertion connection to the PCM? Have you contacted DP Tuner?
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