Two problems related to engine knocking noise have been reported for the 2003 Ford Expedition. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Expedition based on all problems reported for the 2003 Expedition.
While driving at a low rate of speed, my Expedition made a loud pop and then strange knocking noise. Upon further inspection I noticed I had blown out a spark plug and my coil pack was blown apart as well. When I called a local Ford dealership (thomas Ford, stillwater ok) the man laughed and said "no it is not a recall, but absolutely should be as this is a very common occurrence in the triton motor. " I ask that you re-look back into this "common" problem as this is a terrible thing to overlook.
Driving from las vegas to phx we were at wickenberg, az a loud pop occurred and knocking sound from the engine. The smell of gas was present and wouldn't run properly. The Ford dealership in wickenberg was luckily open and instructed us that the spark plugs had blown out in the 1st and 2nd cylinders. They did also tell us that this occurs often in and there is a temp fix for it. They tapped out the head and inserted a steel sleeve for those 2 cylinders. Taking 2 hours it was fixed and we were on our way very happy to have it fixed but not happy at all at Ford for having such a blatant design flaw. This needs to be fixed.