Mechanics

FORD F-150 NOISE PROBLEM

1998 Ford F-150 • 120,000 miles

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







Avatar
Guest
February 22, 2013.



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.

Wrenchtech
Feb 22, 2013.