Forum Discussion
Gjac
Mar 20, 2018Explorer III
I had this happen on my tow car several years ago and it drove me crazy until it finally started to throw a code, miss fire #3 cylinder. I switched #3 coil with #4 still same code, so I knew coil pack was good. Switched #3 and number #4 plug and code went to misfire #4 cylinder so I new it was the spark plug. After careful inspection I noticed a tiny black streak in the white insulator indicating a very small crack. I never noticed it by just looking at it before I ran this test. Good luck and hope you find the problem.
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