High boost - no pull
#31
Just replace the sensor and stuff some of the plastic weed whacker string down the tube to ensure the tube is open.
Think of it this way, if you remove the sensor and start the motor - the tube opening should be spitting exhaust fumes into your clean engine bay, if not then the tube is plugged with carbon and soot.
Also, the sensor is a no return item once the packaging has been opened. So never buy a sensor that has been previously opened.
Think of it this way, if you remove the sensor and start the motor - the tube opening should be spitting exhaust fumes into your clean engine bay, if not then the tube is plugged with carbon and soot.
Also, the sensor is a no return item once the packaging has been opened. So never buy a sensor that has been previously opened.
#32
The following is a gross oversimplification:
At key on, the computer synchronizes Manifold Absolute Presure, atmospheric pressure sensor and EBC and DFP pressure sensor - as they are all ambient at that moment. Once the motor is running, the computer is responding to the go pedal input to manage fuel and air based upon rpm. EBP is telling the computer that there is excess energy available to spool the turbo in order to manage air, accomplished by changing the geometry surrounding the turbo to increase rotation resulting in more air.
Increasing RPM as a response to the go pedal is a synchronization of adding more fuel and then adding more air as there is momentary excess energy in EBP to work with as RPM increases.
So if “no” pressure or “low” presure from EBP, the motor still runs and the computer can only advance the air and fuel management so far because there is little/no excess energy available as reported by EBP.
At key on, the computer synchronizes Manifold Absolute Presure, atmospheric pressure sensor and EBC and DFP pressure sensor - as they are all ambient at that moment. Once the motor is running, the computer is responding to the go pedal input to manage fuel and air based upon rpm. EBP is telling the computer that there is excess energy available to spool the turbo in order to manage air, accomplished by changing the geometry surrounding the turbo to increase rotation resulting in more air.
Increasing RPM as a response to the go pedal is a synchronization of adding more fuel and then adding more air as there is momentary excess energy in EBP to work with as RPM increases.
So if “no” pressure or “low” presure from EBP, the motor still runs and the computer can only advance the air and fuel management so far because there is little/no excess energy available as reported by EBP.
#34
As we all have experienced, over time and temperatures the electronics become a point of vulnerability with age.
I’m good with a life span of 9 to 10 years with EBP.
#35
Okay. Ran a coat hanger & weed eater string down the tube...undid the bottom end as well and tried to clean out as best as possible without removing the tube completely. I installed a nice new shiny EBP sensor from the Ford parts warehouse right down the street. Motorcraft of course. About $109 after tax.
Can't say I notice a real difference. Perhaps I should clean the MAP sensor as well?
It's been so long since I ran the stock HP tune...I can't say I remember how a stock truck is supposed to act. Just seems to be too much boost with not enough ummph behind it.
Bottom end unscrewed. Taken from the fender well.
Bottom end unscrewed. Taken from underneath truck. I worked the wrench from here. Not a lot of room.
Brand new EBP sensor installed.
Can't say I notice a real difference. Perhaps I should clean the MAP sensor as well?
It's been so long since I ran the stock HP tune...I can't say I remember how a stock truck is supposed to act. Just seems to be too much boost with not enough ummph behind it.
Bottom end unscrewed. Taken from the fender well.
Bottom end unscrewed. Taken from underneath truck. I worked the wrench from here. Not a lot of room.
Brand new EBP sensor installed.
#37
subscribing - I have the same symptoms and would like to get it figured out.
I had a 08 F250 KR about 6 months ago, stock with all emissions, etc. It had a crack in the DPF but that was it. It had all kinds of get up and go. the rear axle was a limited slip 3.73
now I have a 08 F350 lariat, rear axle is 3.73 open, and it doesn't have the same pedal response at all. Boost numbers are right, and if you really put the pedal down it will go, but it sounds like it is working too hard all the time. This one is deleted now, but it had all the emissions on it when I got it and acted the same.
I had a 08 F250 KR about 6 months ago, stock with all emissions, etc. It had a crack in the DPF but that was it. It had all kinds of get up and go. the rear axle was a limited slip 3.73
now I have a 08 F350 lariat, rear axle is 3.73 open, and it doesn't have the same pedal response at all. Boost numbers are right, and if you really put the pedal down it will go, but it sounds like it is working too hard all the time. This one is deleted now, but it had all the emissions on it when I got it and acted the same.
#38
#39
Something definitely isn't right there. You should be accelerating much faster than that with that kind of boost, especially if deleted. The trans fluid, even if it was disgusting, wouldn't hold the truck back that much.
How does the truck respond when you dig down into the skinny pedal? Are you egr deleted? What kind of exhaust smoke are you getting on your stock tune?
Not exactly apples to apples, but my 6.0 stayed tuned for about a year and ran great until i flashed it back to stock tuning. It showed higher boost numbers without going accelerating fast. very similar, albeit not as severe, as your truck. It also put out a lot of black smoke on acceleration. The culprit was a sticky egr valve, which was always commanded shut with my tuning. After cleaning the egr valve, ebp tube/sensor, and iat sensor, it was back to normal power and nearly no smoke on stock tuning.
How does the truck respond when you dig down into the skinny pedal? Are you egr deleted? What kind of exhaust smoke are you getting on your stock tune?
Not exactly apples to apples, but my 6.0 stayed tuned for about a year and ran great until i flashed it back to stock tuning. It showed higher boost numbers without going accelerating fast. very similar, albeit not as severe, as your truck. It also put out a lot of black smoke on acceleration. The culprit was a sticky egr valve, which was always commanded shut with my tuning. After cleaning the egr valve, ebp tube/sensor, and iat sensor, it was back to normal power and nearly no smoke on stock tuning.
#40
#41
The op did say that it was regardless of which tune he runs... which would mean egr off and egr on tunes. With a egr on tune the computer should still throw a CEL for lack of egr flow if the valve was stuck.
I also can easily hit 20 psi just going around town, not accelerating hard. If I really need to get somewhere I see 30 and 32 psi very easily.
I also can easily hit 20 psi just going around town, not accelerating hard. If I really need to get somewhere I see 30 and 32 psi very easily.
#42
Something definitely isn't right there. You should be accelerating much faster than that with that kind of boost, especially if deleted. The trans fluid, even if it was disgusting, wouldn't hold the truck back that much.
Agreed...and just did trans flush with no change.
How does the truck respond when you dig down into the skinny pedal? Are you egr deleted? What kind of exhaust smoke are you getting on your stock tune?
Honestly I don't dig down into the skinny pedal. I know from a few instances that the truck will get up and go if you ask it but I feel its working too hard. I do see a bit of the regular soot when I "get on it" like your grandpa would...lol.
Not exactly apples to apples, but my 6.0 stayed tuned for about a year and ran great until i flashed it back to stock tuning. It showed higher boost numbers without going accelerating fast. very similar, albeit not as severe, as your truck. It also put out a lot of black smoke on acceleration. The culprit was a sticky egr valve, which was always commanded shut with my tuning. After cleaning the egr valve, ebp tube/sensor, and iat sensor, it was back to normal power and nearly no smoke on stock tuning.
Agreed...and just did trans flush with no change.
How does the truck respond when you dig down into the skinny pedal? Are you egr deleted? What kind of exhaust smoke are you getting on your stock tune?
Honestly I don't dig down into the skinny pedal. I know from a few instances that the truck will get up and go if you ask it but I feel its working too hard. I do see a bit of the regular soot when I "get on it" like your grandpa would...lol.
Not exactly apples to apples, but my 6.0 stayed tuned for about a year and ran great until i flashed it back to stock tuning. It showed higher boost numbers without going accelerating fast. very similar, albeit not as severe, as your truck. It also put out a lot of black smoke on acceleration. The culprit was a sticky egr valve, which was always commanded shut with my tuning. After cleaning the egr valve, ebp tube/sensor, and iat sensor, it was back to normal power and nearly no smoke on stock tuning.
The op did say that it was regardless of which tune he runs... which would mean egr off and egr on tunes. With a egr on tune the computer should still throw a CEL for lack of egr flow if the valve was stuck.
I also can easily hit 20 psi just going around town, not accelerating hard. If I really need to get somewhere I see 30 and 32 psi very easily.
I also can easily hit 20 psi just going around town, not accelerating hard. If I really need to get somewhere I see 30 and 32 psi very easily.
#43
*UPDATE*
I think a simple reset of the tune may have been the issue. Basically, switched to the 40hp tune...let it run for a minute. Turned it off and put the stock (DPF off) tune back on. Seems to be acting better. Gonna give it a few more miles but that may have done the trick. Good grief...at least I know my MAP and EBP sensors are good.
I think a simple reset of the tune may have been the issue. Basically, switched to the 40hp tune...let it run for a minute. Turned it off and put the stock (DPF off) tune back on. Seems to be acting better. Gonna give it a few more miles but that may have done the trick. Good grief...at least I know my MAP and EBP sensors are good.
#44
#45
Hopefully it works for you as well.