Question about 2004 Ford F150
Have you checked for any small vacuum leaks on any of the emissions hoses? A vacuum leak causes a "too lean" reading. If no leaks, you could have a malfunctioning emissions valve, bad oxygen sensor or fuel injection problem. First I would remove the spark plugs to see if they verify that you have a lean condition. Lean plugs will look white. Google for an image of what a lean burning plug looks like if you like. If they look like burning lean then proceed to trouble shoot each possible area. For example if only one plug shows lean but the others don't you know to look at the injector for only that one cylinder. So don't mix up which plug came from which cylinder.
Posted on Sep 12, 2009
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Posted on Jan 02, 2017
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