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: 158,214 (117,000–205,000)
Engines affected: 4.6L V8, 5.4L V8
8 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004
16 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.
2 people like thisFlag inappropiate
1998 Ford Expedition- 4.6L V8205,000
Changed spark plug
1 person likes thisFlag inappropiate
changing spark plugs - the old ones have over 100K on them
1 person likes thisFlag inappropiate
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 1...so changed all. Then code for crank shaft sensor...changed it. Now code for MAF Sensor.
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