2000 Ford Expedition Trouble Code P0171

2000 FORD EXPEDITION
88,000 MILES • V8 • 2WD • AUTOMATIC
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RTRAVIS
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  • 1 POST
I changed the spark plugs and now am getting a P0171 trouble code. I have douple checked the connections running from the air filter to the throttle body and everthing is tight (I had to remove this to get to the plugs). I have also cleaned the AMF with an electrical cleaning solution.

I don't get the code right away, seems like the engine has to reach operating temperature to trip the code.
May 24, 2010 at 2:30 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Lean condition: P0171

Could be caused by the following, low fuel pressure, dirty fuel injectors, leaky EGR and PCV valves and vacuum leaks-
May 25, 2010 at 2:50 AM
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