Help fixing cylinder 2 misfire on 2.4

Dec 26, 2018
Hi, about a week ago my 2.4L on my 2003 began running rough and I found out it was a cylinder 2 misfire. I replaced the plugs and no change. Today I replaced the wires and still no change.

Should my next step be to change the coil or swap the injectors to see if that indicates a bad injector? Or should I just buy some new better injectors and see if that does the trick?

Thank you!


Staff Member
Sep 28, 2015
Salem, Oregon
It might be worth checking the coil pack in that case.

This video shows how to test the coil packs on a 4.0, but it's the same principle on a 2.4. This would at least rule the coil pack out as the culprit:



TJ student
Supporting Member
Jan 9, 2018
Farmersville, TX, United States
Are you getting a P302 code?
Are you getting any other engine codes ?
I have been chasing a misfire in cyl 3 for months and i now believe it has a 'tulip' valve, which is associated with some 4 cyl jeep engines.
You might try swapping the cyl 2 spark plug with another plug, clear the code and see if it returns.
You might also swap the cyl 2 spark plug wire with another to rule that out as well.
Same with the #2 injector. Swap some parts, clear the code. If the code comes back we need to do some more troubleshooting
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