Originally Posted by pasprobe

Both 2011 and 2012 use MAP for fuel calculation, they change what they call MAF from 2011 to 2012 for a better design but it's not a real MAF, they use it only for air temperature (IAT). So both use MAP but in 2011 they used 2 bar at both place in some truck and since 2012 they use 2bar for MAP and 3bar for TCB-A.

With torque, MAP=boost and TCB-A=intake BARO=BARO (if you want to have the boost just remove the BARO from TCB-A)
I use a snap-one obdII tool but I also correlate those values with torque and seams to be pretty much the same.

For the startup reading, just put the key at ignition and take the value without starting the truck, like that all 3 sensors are suppose to have the same value (atmospheric pressure) of your place (use weather channel to correlate)

Originally Posted by FX4HAWAII

I was getting really ****ty gas mileage in my 2012 F150 FX4 screw ecoboost with 3.73s and when I say ****ty I mean 12 mpg city and on 16 hwy. the sad part is that I wasn't beating on the truck but then I changed to non-ethonal gas and now I'm getting 14.7mpg city and 21mph hwy! Try it out it might work for you, and yes it's more expensive up front per gallon but it last longer, and in the long run a better value!

Originally Posted by pasprobe

...Here is my results of those 3 sensors at start-up:

MAP=12.5hg
TCB-A=28.91hg
BARO=29.31hg

as per ford book, my MAP sensor is out of tolerance and should through a code but I don't have any code... The MAP sensor is always seeing more boost, so add more gas and flood the engine and always try to correct it with trim, but 100% of the time the trim are in negative value so to much gas... maybe I find something. I'll try to swap them because they are nearly the same.

here is what the book said about those sensor:

At key-up BARO, TCB-A, and MAP are compared. If any two agree and one does not, that sensor is declared
faulted.
BP, TIP, MAP Sensor 3-Way Correlation Check at Key-Up
DTCs P2227 P0236 P0106 Barometric Pressure Circuit Range/Performance
...

Originally Posted by engineermike

Interesting find, and perhaps a clue. Have you checked the widebands to see if the actual resultant A/F ratio is stoichiometric?

Originally Posted by budget rapta

God I hope you guys are on to something.

Originally Posted by pasprobe

Our ecoboost use 3 sensors to calculate fuel ratio. MAP (after the throttle body) TCB-A (before throttle = intake) and BARO (inside ECM).
Here is my results of those 3 sensors at start-up:

MAP=12.5hg
TCB-A=28.91hg
BARO=29.31hg

as per ford book, my MAP sensor is out of tolerance and should through a code but I don't have any code... The MAP sensor is always seeing more boost, so add more gas and flood the engine and always try to correct it with trim, but 100% of the time the trim are in negative value so to much gas... maybe I find something. I'll try to swap them because they are nearly the same.

here is what the book said about those sensor:

At key-up BARO, TCB-A, and MAP are compared. If any two agree and one does not, that sensor is declared
faulted.
BP, TIP, MAP Sensor 3-Way Correlation Check at Key-Up
DTCs P2227 P0236 P0106 Barometric Pressure Circuit Range/Performance
Monitor execution At key-up
Monitor Sequence None
Sensors OK BP, MAP, TIP
Monitoring Duration 0.2 seconds
BP, TIP, MAP Sensor 3-Way Correlation Check at Key-Up Entry Conditions
Entry condition Minimum Maximum
Engine off (soak) time 10 seconds
Battery Voltage 6.75 volts

Typical BP, TIP, MAP Sensor 3-Way Correlation Check at Key-Up Malfunction Thresholds
|TCB-A – MAP| < 2.72"Hg
|BARO – MAP| < 2.03"Hg
|BARO – TCB-A| < 2.14"Hg

Originally Posted by engineermike

Interesting find, and perhaps a clue. Have you checked the widebands to see if the actual resultant A/F ratio is stoichiometric?