[Diy_efi] Exhaust manifold pressure sensors

[J]

Ahhh the infamous DPFE sensor.  It's actually used to detect a pressure drop 
across a restriction in the EGR tube on the exhaust side of the vavle, to 
detect the flow rate through the tube to ensure proper EGR operation.  It's 
also one of the most common failure parts on late-90's Ford vehicles.  We 
replace 1-2 a week (on average) at my shop.  They've been redesigned 3 or 4 
times, and they still tend to fail.  I would stick with the 2- or 3-bar MAP 
sensor and a moderately long hose (maybe 2-3ft) for temp. isolation.