Test codes 171 & 174 came up said it is.

Tiny
ANONYMOUS
  • MEMBER
  • 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
  • MECHANIC
  • 20,758 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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