04 WJ 4.0 mid rpm misfires clears on restart 02 Jeep WJ with 4.0
The engine will multiple cylinder misfire if rev over 2.5 rpm. A very rough misfire will continue until engine is restarted at which time it clears right up.
I connected Torque Pro app with a bluetooth adapter and shows o2 sensor data are seemingly good. I dont often rev the engine but have never had this issue prior to changing both upstream o2 with NTK a week ago. Again the data seems to look okay from those.
Fuel pressure shows a solid 50 psi at fuel rail. There is a slight leak down with engine off but confirmed it is not a leaking injector, likely failing 1-way and doubtful it s part of the problem.