1998 Ford F-150 Repair Question
Topics covered: Noise.
Mileage: 120,000 miles.
Mileage: 120,000 miles.
Asked on February 22, 2013
Ford F-150 Noise Problem
Test codes 171 & 174 came up said it is running lean how do I fix
Asked by (pending member)Answer
Replied on 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.
