Join Date: Jan 2011
Location: Clarksville, Tn.
Re: 2003 Expedition Running Rough after Spark plug Blow Out
I ran into this once, and the fix was simple for me. I simply had accidentally dislocated the spring in the coil when I pulled it off. So when I installed the same coil back on, it wasnt actually making connection. So my preventative for that now is just to simply disassemble coil boots and springs from the coil itself and reassemble. It also gives me a chance to inspect them. But, if this is not your problem, try individually unplugging coils to see if any one of them isnt affected when you unplug it. If the cylinder you just worked on isnt affected, then you need to either reconsider the work you did, or test the coil.
2001 Ford Expedition Eddie Bauer 4x4 (mine)
2003 Ford Focus SE (the wifey)