TEST CODES 171 AMP 174 CAME UP SAID IT IS ...

  • Tiny
  • Anonymous
  • 1998 Ford F-150
  • 120,000 miles

Test codes 171 & 174 came up said it is running lean how do I fix







Friday, February 22nd, 2013 AT 4:52 PM

1 Reply

  • Tiny
  • Wrenchtech
  • Expert
  • 20,285 posts

On a Ford that is nearly always a severe vacuum lean. Listen for a hissing noise when idling and follow it to it's source. They are notorious for sucking holes through large rubber connectors and PCV hoses.

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Friday, February 22nd, 2013 AT 5:12 PM

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