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  1. TJ Technical Discussion
    I have a 2001 TJ 4.0 IL6 with 191K miles on it. The check engine light started flashing and when I ran the code, it said P0301. Cylinder 1 misfire. I had already done a tune up of the spark plugs and the coil pack last summer. This was before the code started. So I went back to the drawing...
  2. JK Technical Discussion
    Hello everyone, Ive been trying to diagnose this issue for quite some time now and I am stumped. My 2012 Jeep JKU with about 85k miles, keeps having issues with misfiring, codes P0300 / P0301 / P0303 / P0305 keep popping up. At first I thought it could be spark plugs and/or ignition coils...
  3. TJ Technical Discussion
    Hi there, i have a 2004 Jeep that has been on its last legs for awhile due to cylinder misfire codes. I’ve had the catalytic converter replaced among many other things in the last few years, and it will go periods of time without throwing a code (as long as i don’t drive it long distances and...
  4. TJ Technical Discussion
    so recently I was about to get the jeep smogged and it threw a cel when I entered the parking lot. took it home and connected it to my code reader and it was a p0301 cylinder misfire. so I started to investigate and do some research. the symptoms I can tell so far, rough idle upon start up that...
  5. TJ Technical Discussion
    Hey Wrangler Forum, I'm here to ask for help figuring out my Cylinder one misfire (P0301) code that intermittently comes on in my 1999 Sahara. I bought the jeep about a year and a half ago and it would come on, then disappear every now and again, nothing too serious, but not its's showing up...
  6. TJ Technical Discussion
    I have a 1997 Jeep TJ 4.0 liter Automatic. I went down to Autozone and got some codes read once my check engine came on. I got 5 codes: P0300 - Cylinder misfire detected - Random cylinders P0301 - Cylinder misfire detected - Cylinder Number 1 P0302 - Cylinder misfire detected - Cylinder...
  7. TJ General Discussion
    Looking for answers, any ideas are appreciated... My 2004 TJ Sport has trouble starting when cold. It cranks a couple of times before turning over. After running for a bit, if i don't let it sit for too long, it starts up quick, no problems. It was throwing an engine light and a P0301 code...
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