Codes P0174 and P0310

2004 FORD F-250
200,000 MILES • 6.8L • V10 • 4WD • MANUAL
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DEANE1935
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Getting codes P0310 and P0174. Have changed plugs (Motorcraft) and swapped #10 coil pack and bank 2, o2 sensor. compression is good. Vacuum is good. Gas mileage is way down. Does a P0310 cause a P0174 or just the opposite? Any help appreciated.
Nov 21, 2017 at 3:20 PM
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JACOBANDNICKOLAS
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The 174 is most likely causing the 310. A lean fuel mixture is usually the result of a vacuum leak. Check for that first. If nothing is found, then I would check to see if the fuel pump pressure is within the manufacturer's specs.
Nov 22, 2017 at 4:29 PM