2003 FOR EXPEDITION 5.4 L NO ACCELARATION WHEN DRIVING

  • Tiny
  • sportsislife
  • 2003 Ford Expedition
  • 130,000 miles

Have a 2003 for expedition 5.4 L. I have been having problems with this that no one can figure out for some reason. I have no accelaration when driving. It just revs up. I took it to a local machanic and a fordalership. They said change the egr valve so I did that and the dpfe sensor. It still runs bad. I have two codes p0171 p0125 I have checked for vaccum leak. I changed my o2 sensor and mas air flow sensor. Now my check engine light is on and I drive it and the engine keeps running but all power falls off.

Monday, April 2nd, 2012 AT 7:10 PM

3 Answers

  • Tiny
  • rivermikerat
  • Expert
  • 6,184 posts

P0171-Check the injector pulses. Pull the catalytic converter and give a quick test drive. If you can, buy a pipe that will fit in place of the converter temporarily to test it. If the power comes back, replace the converter.

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Monday, April 2nd, 2012 AT 7:30 PM
  • Tiny
  • sportsislife
  • Member

That all tested out fine.

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Monday, April 2nd, 2012 AT 7:43 PM
  • Tiny
  • rivermikerat
  • Expert
  • 6,184 posts

Check transmission fluid pressure.

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Monday, April 2nd, 2012 AT 8:01 PM

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