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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  • 1 POST
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 7:20 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
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 8:29 AM
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