I wanted to start a thread because i will be attempting the repair tomorrow.
![4490334]( "4490334")
I have been having my check engine light come on for about 5k miles now with the code p0304 cylinder 4 misfire, the engine is running perfectly fine no hesitation, good acceleration, idles at 680 like it should, rpm needle dosnt bounce at all...so i have been clearing the code and this would make it the 3rd time cleared. The check engine like comes on when i idle for a long time after the engine is at operating temperature. After connecting a snap on scanner to the obd2 port and watching the cylinder misfire detection mode, the jeep has no misfire when cold or even when driving before operating temp. After operating temp is achieved and at idle i noticed the misfire getting worse and worse. My jeep has 44k miles. So i will be starting my repair by taking off the air intake manifold to gain access to cylinder 4 on the driver side, and replacing the coil and spark plug and possibly moving the #4 injector to a different cylinder to see if the misfire moves. I have been doing a bit of research on the possible causes of this misfire. bad cylinder head, low compression, rocker or roller or even faulty lifter. Also, which i thought was pretty interesting, on the scantool injector #4 had a pulse width around 2900 compared to 2500 on all other cylinders.
I hope you found this thread helpfull and if you can relay any information or would like to stay posted let me know, that would be awesome 👍💪
![4490335]( "4490335")
I have been having my check engine light come on for about 5k miles now with the code p0304 cylinder 4 misfire, the engine is running perfectly fine no hesitation, good acceleration, idles at 680 like it should, rpm needle dosnt bounce at all...so i have been clearing the code and this would make it the 3rd time cleared. The check engine like comes on when i idle for a long time after the engine is at operating temperature. After connecting a snap on scanner to the obd2 port and watching the cylinder misfire detection mode, the jeep has no misfire when cold or even when driving before operating temp. After operating temp is achieved and at idle i noticed the misfire getting worse and worse. My jeep has 44k miles. So i will be starting my repair by taking off the air intake manifold to gain access to cylinder 4 on the driver side, and replacing the coil and spark plug and possibly moving the #4 injector to a different cylinder to see if the misfire moves. I have been doing a bit of research on the possible causes of this misfire. bad cylinder head, low compression, rocker or roller or even faulty lifter. Also, which i thought was pretty interesting, on the scantool injector #4 had a pulse width around 2900 compared to 2500 on all other cylinders.
I hope you found this thread helpfull and if you can relay any information or would like to stay posted let me know, that would be awesome 👍💪
