1998 Ford F 150 Test Codes 171 And 174 Came Running Lean Fix

1998 FORD F-150
120,000 MILES
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Test codes 171 & 174 came up said it is running lean how do I fix







Feb 22, 2013 at 4:52 PM
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WRENCHTECH
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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.
Feb 22, 2013 at 5:12 PM
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