Codes P0174 and P0310

Tiny
DEANE1935
  • MEMBER
  • 2004 FORD F-250
  • 6.8L
  • V10
  • 4WD
  • MANUAL
  • 200,000 MILES
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.
Tuesday, November 21st, 2017 AT 3:20 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 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.
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Wednesday, November 22nd, 2017 AT 4:29 PM

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