EBP sensors
Fleet Mechanic
Joined: Jun 2015
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I thought the map sensor was supposed to read 14.7? My ebp and boost are always within .5 of each other while running down the road. The map is usually 3X a higher value than the ebp and boost. I’m gonna have to check my koeo readings later this evening.
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From: Lake Hartwell, GA
MAP and boost are NOT (see correction below, my mistake) the same measurement.
Baro, MAP and EBP should be within .5 of each other on a cold engine with the key on and engine off. Whichever one of those is not like the others is indicated to be faulty. Baro is internal to the PCM on most of the 7.3L PSD's and is rarely the suspect faulty sensor. I forget which MY had an external Baro sensor, maybe the E99's?
While running down the road, the desire to have a 1:1 ratio between MAP and EBP is optimal. A turbo system that creates too much EBP when boosting is creating excess pressure and heat.
FDB, did you purchase a Motorcraft EBP sensor? Did you clean the tube that runs from the sensor mount to the exhaust manifold before running the scan?
Baro, MAP and EBP should be within .5 of each other on a cold engine with the key on and engine off. Whichever one of those is not like the others is indicated to be faulty. Baro is internal to the PCM on most of the 7.3L PSD's and is rarely the suspect faulty sensor. I forget which MY had an external Baro sensor, maybe the E99's?
While running down the road, the desire to have a 1:1 ratio between MAP and EBP is optimal. A turbo system that creates too much EBP when boosting is creating excess pressure and heat.
FDB, did you purchase a Motorcraft EBP sensor? Did you clean the tube that runs from the sensor mount to the exhaust manifold before running the scan?
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
MAP and boost are the same measurement.
Baro, MAP and EBP should be within .5 of each other on a cold engine with the key on and engine off. Whichever one of those is not like the others is indicated to be faulty. Baro is internal to the PCM on most of the 7.3L PSD's and is rarely the suspect faulty sensor. I forget which MY had an external Baro sensor, maybe the E99's?
While running down the road, the desire to have a 1:1 ratio between MAP and EBP is optimal. A turbo system that creates too much EBP when boosting is creating excess pressure and heat.
FDB, did you purchase a Motorcraft EBP sensor? Did you clean the tube that runs from the sensor mount to the exhaust manifold before running the scan?
Baro, MAP and EBP should be within .5 of each other on a cold engine with the key on and engine off. Whichever one of those is not like the others is indicated to be faulty. Baro is internal to the PCM on most of the 7.3L PSD's and is rarely the suspect faulty sensor. I forget which MY had an external Baro sensor, maybe the E99's?
While running down the road, the desire to have a 1:1 ratio between MAP and EBP is optimal. A turbo system that creates too much EBP when boosting is creating excess pressure and heat.
FDB, did you purchase a Motorcraft EBP sensor? Did you clean the tube that runs from the sensor mount to the exhaust manifold before running the scan?
Are you sure about that? I thought that boost=MAP-Baro.
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MAP and boost are the same measurement.
Baro, MAP and EBP should be within .5 of each other on a cold engine with the key on and engine off. Whichever one of those is not like the others is indicated to be faulty. Baro is internal to the PCM on most of the 7.3L PSD's and is rarely the suspect faulty sensor. I forget which MY had an external Baro sensor, maybe the E99's?
While running down the road, the desire to have a 1:1 ratio between MAP and EBP is optimal. A turbo system that creates too much EBP when boosting is creating excess pressure and heat.
FDB, did you purchase a Motorcraft EBP sensor? Did you clean the tube that runs from the sensor mount to the exhaust manifold before running the scan?
Baro, MAP and EBP should be within .5 of each other on a cold engine with the key on and engine off. Whichever one of those is not like the others is indicated to be faulty. Baro is internal to the PCM on most of the 7.3L PSD's and is rarely the suspect faulty sensor. I forget which MY had an external Baro sensor, maybe the E99's?
While running down the road, the desire to have a 1:1 ratio between MAP and EBP is optimal. A turbo system that creates too much EBP when boosting is creating excess pressure and heat.
FDB, did you purchase a Motorcraft EBP sensor? Did you clean the tube that runs from the sensor mount to the exhaust manifold before running the scan?
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FTE Leadership Emeritus
Joined: May 2014
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From: Lake Hartwell, GA
Let me double check... I'll be right back...
EDIT: You were right and this was my first instance of being wrong today, so I am glad it was here in the virtual world instead of something else I have to fix in the real world.
Boost
(AKA Manifold Gauge Pressure)
Short Name: Boost
PID: 221440
Units: PSI
Max/Min: 30.0/0.0 (stock) 40.0/0.0 (performance)
Equation: (((A*256)+B)*0.03625)-[221442]
"-[221442]" subtracts the Barometric sensor (located on the PCM on some trucks, external on others) reading from the MAP reading - and this gives you just the boost pressure above atmospheric pressure.
Source: https://www.ford-trucks.com/forums/1...l#post16005729
I made the assumption that since a mechanical boost gauge can be tapped into the spider or Y-pipe which is similar to where the MAP sensor is tapped into via a hose that they were the same measurement/reading. I assumed wrong and have gone back to edit my original incorrect statement.
EDIT: You were right and this was my first instance of being wrong today, so I am glad it was here in the virtual world instead of something else I have to fix in the real world.
Boost
(AKA Manifold Gauge Pressure)
Short Name: Boost
PID: 221440
Units: PSI
Max/Min: 30.0/0.0 (stock) 40.0/0.0 (performance)
Equation: (((A*256)+B)*0.03625)-[221442]
"-[221442]" subtracts the Barometric sensor (located on the PCM on some trucks, external on others) reading from the MAP reading - and this gives you just the boost pressure above atmospheric pressure.
Source: https://www.ford-trucks.com/forums/1...l#post16005729
I made the assumption that since a mechanical boost gauge can be tapped into the spider or Y-pipe which is similar to where the MAP sensor is tapped into via a hose that they were the same measurement/reading. I assumed wrong and have gone back to edit my original incorrect statement.
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From: Lake Hartwell, GA
My wife is very forgiving when I make mistakes. Although I am typically very hard on myself and sometimes make another mistake following the first mistake depending on the severity of the first mistake.
It happens, none of us are perfect and I will probably make another mistake today, plenty of time left... Yesterday when making our homemade Big Macs (click this link for picture) I had intentions of making 2 Big Macs and a Mac Jr. Well, because I am a jackass sometimes I had food on my brain, I failed to count to 5 and only made 4 patties. Which made 1 Big Mac, 1 Mac Jr. and left a patty to fend for itself. Luckily though this was a first world problem because the Big Mac was YUUUUUUGGGEEEE and was enough of a challenge to eat by itself, let alone the sweet potato fries next to it.
Sorry for the thread derailment, but maybe it will bring some laughs to someone out there that just made a mistake...
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Absolutely because they hear everything and what they don't hear the somehow know about...
My wife is very forgiving when I make mistakes. Although I am typically very hard on myself and sometimes make another mistake following the first mistake depending on the severity of the first mistake.
It happens, none of us are perfect and I will probably make another mistake today, plenty of time left... Yesterday when making our homemade Big Macs (click this link for picture) I had intentions of making 2 Big Macs and a Mac Jr. Well, because I am a jackass sometimes I had food on my brain, I failed to count to 5 and only made 4 patties. Which made 1 Big Mac, 1 Mac Jr. and left a patty to fend for itself. Luckily though this was a first world problem because the Big Mac was YUUUUUUGGGEEEE and was enough of a challenge to eat by itself, let alone the sweet potato fries next to it.
Sorry for the thread derailment, but maybe it will bring some laughs to someone out there that just made a mistake...
My wife is very forgiving when I make mistakes. Although I am typically very hard on myself and sometimes make another mistake following the first mistake depending on the severity of the first mistake.
It happens, none of us are perfect and I will probably make another mistake today, plenty of time left... Yesterday when making our homemade Big Macs (click this link for picture) I had intentions of making 2 Big Macs and a Mac Jr. Well, because I am a jackass sometimes I had food on my brain, I failed to count to 5 and only made 4 patties. Which made 1 Big Mac, 1 Mac Jr. and left a patty to fend for itself. Luckily though this was a first world problem because the Big Mac was YUUUUUUGGGEEEE and was enough of a challenge to eat by itself, let alone the sweet potato fries next to it.
Sorry for the thread derailment, but maybe it will bring some laughs to someone out there that just made a mistake...
There IS a thread for this! 
But I am the same way. I am far from perfect and often do things when I know better and when I make stupid mistakes I'm mad at myself for quite a while.
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