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2007 F250 5.4 Baro reading?

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Old Jan 11, 2020 | 03:15 PM
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Mark Rivers
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2007 F250 5.4 Baro reading?

I am working on this truck and have fixed many issues from huge vacuum leak on the intake manifold (R&R manifold) to Up stream O2 sensor. I have no current codes but it still won't idle well. fuel trims are all over the place depending on RPM. I have a Baro reading on the scan tool that says 86 kPa.. it seems to act like it thinks I am at extremely high altitude and is cutting back the fuel. Fuel trims trending high. I know there is not a Barometric Absolute pressure sensor on this gas engine but where am I getting the 86 kPa reading from?
 
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