Check Engine code P0304
#1
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Year: 2001
Model: Cherokee (XJ)
Engine: 4.0
Check Engine code P0304
I have a 2001 Cherokee. It has been lifted 4" with 33's on it. Still in progress of doing many more mods. I keep getting the P0304 code which is cylinder 4 misfire. I have changed all the spark plugs with top line parts. I also changed the long coil pack as it is the 4.0L straight 6. I still keep getting that code coming up but it doesn't seem to be running poorly as you would think it should with a cylinder misfiring. Although my gas mileage is horrible it is around 10 miles to the gallon. not really sure what else to check. could use some advise please
#2
Senior Member
How did the number 4 plug look when you replaced it ? I assume you got the code before and after replacement ? If it seems to “run fine” besides poor mileage and check engine code I would check compression .
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