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Ok, on to my next issue. I have an engine code 300 - all cylinder misfire and codes 301,302,303,304,305,306 - individual cylinder misfires.
Changed all tune up stuff - plugs (champion), wires, cap, rotor, air filter.
They all needed changed so that was my first shot. Cleared the light with it coming back on within a day.
Did some digging here and all over the net for a common problem to these codes for a 98 tj with a 4.0 auto and found out there were a bad batch of valve springs that were not letting the valves shut fast enough at higher rpms, thus throwing the misfire codes.
Changed the springs along with new valve seals and was surprised to see the top end was very clean for 184k. Cleared the codes with hopes of this being the problem. Jeep seemed to run smoother (at least in my head). Light came back on after about 40 miles.
Which direction should I go now? It runs & idles great, you would never know it had a "misfire" by driving it. I still need to do a fuel pressure check, change the fuel filter/regulator and a compression test. I don't think a coil would be the culprit with it running so good. Computer?
Changed all tune up stuff - plugs (champion), wires, cap, rotor, air filter.
They all needed changed so that was my first shot. Cleared the light with it coming back on within a day.
Did some digging here and all over the net for a common problem to these codes for a 98 tj with a 4.0 auto and found out there were a bad batch of valve springs that were not letting the valves shut fast enough at higher rpms, thus throwing the misfire codes.
Changed the springs along with new valve seals and was surprised to see the top end was very clean for 184k. Cleared the codes with hopes of this being the problem. Jeep seemed to run smoother (at least in my head). Light came back on after about 40 miles.
Which direction should I go now? It runs & idles great, you would never know it had a "misfire" by driving it. I still need to do a fuel pressure check, change the fuel filter/regulator and a compression test. I don't think a coil would be the culprit with it running so good. Computer?