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At a loss....
Ok, I have a 2004 expedition, 5.4L, 4WD. I'm at 156k. A couple of months ago I noticed that the engine would bog down if I stomped on the gas. Sometimes it would back fire and the CEL would flash. I replaced the bank 1 sensor 1 O2 sensor and it seemed to help. Now it is running real rich on the...- jonezin_nj
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- Forum: 2nd Gen Ford Expedition Engine & Performance
