I have a 2014 flex EB and 2017 SHO, both appear to have dual MAP sensors, 1 before the throttle body and one in the intake manifold. Why does only 1 get replaced with a 3 bar MAP when doing a tune upgrade? Is the one before the throttle body already a 3 bar MAP?
Yup! Check out this thread...
https://www.ecoboostperformanceforum.com/index.php?topic=6952.0