CODE P0174 ONLY

  • Tiny
  • wldman46
  • 1998 Ford F-150
  • 110,000 miles

Use to set about 200 miles or so now less than 50. Idle sounds like a deisel rattling valves. Sets very fast if put under load. Found dry roted hose to brake booster replaced no codes 2 weeks later setting less than 50 miles. Cant find any vacuum leaks. Poor milage. Under load every now and then about 6 monthes it will set P0171.

Wednesday, March 14th, 2012 AT 6:40 PM

1 Answer

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

171,174 codes are from vacuum leaks, low fuel pressure, mass air flow bad or pcv valve. I suggest a shop with a smoke tester to smoke the intake system for leaks. I would start there before exploring other possibilities.

Roy

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Wednesday, March 14th, 2012 AT 8:17 PM

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