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
4 people shared problem details
2004 Ford Expedition- 4.6L V8153,000
Rough idle and hesitation. Cleaned PCV and found a crack in the elbow that attaches to the trottle body. New hose and problem gone.
1998 Ford Expedition- 4.6L V8205,000
Changed spark plug
changing spark plugs - the old ones have over 100K on them
2000 Ford Expedition- 5.4L V8130,000
Code cylinder 8 & 4 misfire. Changed coil & spark plug on 8 & 4. Then code cylinder 7 * 3...changed...then code cylander changed all. Then code for crank shaft sensor...changed it. Now code for MAF Sensor.
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