Home >> Ford Truck >> 1983 >> F 150 2WD Pickup L6-300 4.9L >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Technical Service Bulletins >> All Technical Service Bulletins >> Emissions Diagnosis - Manual Revisions >> 4.9L Truck (Sect. 17-27; 17-28; 17-31) >> Fuel Always Rich