So I’m new to the forums and I’m having problems with my 2002 jeep tj 4.0 I have replaced spark plugs with the auto lite iridium’s and and the coil packs the injectors are all good and when I’m watching the missfires on the scanner and I’ll be watching it will be missing on Cylinders 1 and 5 then we can shut it off and wait a little bit and it will change to 2 other cylinders then I put another new coil pack on it and it changed to 2 other cylinders and it’s completely random no codes other then the missfires on whatever cylinders it’s on any ideas
2002 jeep tj random missfire
- Thread starter Conner504
- Start date
Have you tried using some sort of aerosol carbon remover? Mopar used to sell a can specifically for the 4 liter. Sea foam works pretty good if you buy the kit that attaches it to a vacuum hose. You could also just pour it directly into the throttle body with the engine running. Make sure your in a place that won’t call the fire dept because it smokes like crazy. I’d also swap the plugs out to a stock replacement like champion or NGK.
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