I have a 2002 Dodge Dakota Quad Cab slt with 4.7L Magnum V8. My check engine light came on when I was at work. I then drove 20 miles home to my house, pulled out my scan tool and discovered I had a misfire in cylinder 7. Next I cleared the code and drove about 20 miles the next day and at the very end of the day the check engine light came back on same code.

Troubleshooting Work:

I switched the coil packs on cylinder 1 and 7 cleared the code and let the car idle. The misfire in cylinder 7 code quickly reappeared. Next I felt the fuel injector and verified it was working. Finally, I tested the electrical system and found the coil was getting power. Now I have narrowed down the issue to the spark plug. Unfortunately, my spark plug removal tools are 10 miles away.


By the time I get to the my spark plug tools I will have driven the car 50 miles plus sometime idling while troubleshooting. If the spark plug is not the issue and I have to take it in to a shop I could potentially drive it 50 more miles. Will this damage my catalytic or 02 sensors? Or any other component?


Will driving my 2002 Dodge Dakota Quad Cab slt with a 4.7L Magnum V8, 100 miles with a cylinder 7 misfire damage my catalytic or 02 sensors? Or any other component?


  • Joel

You should be fine.

Though I would recommend unplugging the connector to fuel injector #7 to minimize the amount of unburnt fuel that makes its way to the catalytic converter.

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  • 1
    Very good recommendation on unplugging the fuel injector ... if you are dumping fuel into a misfiring cylinder it could lead to cat damage. – Pᴀᴜʟsᴛᴇʀ2 Oct 18 '15 at 0:20

While you have that spark plug out, i would highly recommend doing a compression check on that cylinder while you have everything off/out.

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