Ignition Coil Failure Due to Excessive Spark Plug Gap on Ford F-150 Heritage

An illuminated Check Engine Light could indicate that one or more of the ignition coils has failed due to excessive spark plug gap. To fix this problem, the ignition coils that have failed, the spark plugs, and all coil boots should be replaced.

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Average mileage: 105,752 (52,000–138,256)
Engines affected: 4.2L V6, 4.6L V8, V8
1 model year affected: 2004
4 people reported this problem
2 people shared problem details
engine started missing,scanner said misfire on #1 cylinder,service engine light did not come on until after I unhooked scanner
2004 Ford F-150 Heritage- 4.2L V652,000
engene light stays on.
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