Car Problem Reports

Jeep Wrangler Check Engine Light due to cylinder #3 misfire

Jeep Wrangler Problem
3 Reports
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Model Years Affected: 2003, 2004

Engine Affected: 4.0L 6 Cylinder


A Check Engine Light may illuminate indicating a "Cylinder #3 Misfire." This normally occurs in hot weather after the vehicle has been driven, parked for ten to twenty minutes, and then restarted. Heat from the exhaust vaporizes fuel inside the #3 fuel injector and causes the misfire. Installing an insulator sleeve normally lowers the temperature enough so the fuel will not vaporize.

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