Check Engine Light due to worn spark plugs on Ford Expedition

An illuminated Check Engine Light may indicate that the spark plugs are worn; this will cause intermittent misfire and damage to the coil packs.

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Average mileage: 165,268 (117,000–205,000)
Engines affected: 4.6L V8, 5.4L V8
9 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005
19 people reported this problem
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Viewing 1 - 4 of 4 problem details
1998 Ford Expedition - 4.6L V8 205,000 mi,
Changed spark plug
2004 Ford Expedition - 4.6L V8 153,000 mi,
Rough idle and hesitation. Cleaned PCV and found a crack in the elbow that attaches to the trottle body. New hose and problem gone.
2003 Ford Expedition - 5.4L V8 205,000 mi,
changing spark plugs - the old ones have over 100K on them
2000 Ford Expedition - 5.4L V8 130,000 mi,
Code cylinder 8 & 4 misfire. Changed coil & spark plug on 8 & 4. Then code cylinder 7 * 3...changed...then code cylander 1...so changed all. Then code for crank shaft sensor...changed it. Now code for MAF Sensor.