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2002 Taurus SE vulcan 3.0 - not flex fuel - returnless fuel system
Completely stumped on what the cause is
Replaced:
All 6 Fuel Injectors
EVAP canister purge control valve(on the firewall passenger side)
Catalytic converters
PCM
Fuel pump(fuel pressure sensor works fine, compared its' reading to a mechanical gauge, both read the same)
MAF sensor
Both upstream O2 sensors
Both ECT sensors

Both banks' LTFT read -20% and worse at idle
Both banks' LTFT read around -10% cruising at 60 mph
Fuel pressure normally reads 40 psi, sometimes reading higher right after startup, about 50 to 60 psi.
 
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