Intermittent cylinder 4 misfire
- Thread starter Fistlaw
- Start date
How to Reset the ECU on a Jeep Wrangler JK
While there are folks that swear resetting your ECU does absolutely nothing, it's a common practice among automotive enthusiasts. The ECU (Electronic Control Module) "learns" your driving style and the parts in your ride by storing information in its memory, information that it gathers using a...
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WestCoastDan
JK Enthusiast
I recommend examining the wire harness at/around cylinder #4.
If you feel ambitious, consider swapping the plug and coil pack from #4 w/ another and see if the misfire remains on #4.
I would also consider doing a compression/leakdown test.
Although rare, I recently read a post stating that their misfire was the result of a crack in the head.
If you feel ambitious, consider swapping the plug and coil pack from #4 w/ another and see if the misfire remains on #4.
I would also consider doing a compression/leakdown test.
Although rare, I recently read a post stating that their misfire was the result of a crack in the head.
