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misfire
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  1. JK Tech Forum
    Hello All. I need some help with an intermittent issue that the dealer has been useless for. This is regarding a stock 2016 JKU Rubicon with 41,900 miles. I bought this new in '16 and a week after leaving the dealership, the jeep threw a P0300 code... random cylinder misfire. The dealership did...
  2. JK General Discussion Forum
    Ok, I have a cylinder 4 misfire and also sometimes a 2. I did already get the left cylinder head replaced under the warranty but it has come back and they even double checked everything and claim it looks good. It also has coil packs which are less than 6 months old and spark plugs that are now...
  3. TJ Tech Forum
    ok so the past couple of days I’ve noticed my exhaust start to pop at idle, didn’t sound like a misfire at first but then it got worse. Seems to only misfire and pop at idle or accelerating but as soon as I get past ~1k The misfire goes away. Changed rotor, cap, wires, and plugs about 5k miles...
  4. JK Tech Forum
    Hey Everybody, I'm usually over in the TJ forums, but today it's my wife's JK that's acting up. Last week she started getting a PO303 #3 Misfire and it was driving rough, okay, no biggie right, change the plugs and coil packs while I'm there. They were overdue anyway. Got 6 Champion RER8ZWYCB4...
  5. JK Tech Forum
    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...
  6. JL Wrangler Technical Discussion
    Hey everyone, need advice... Driving home and jeep starts to go crazy. Over heat lights go on, engine rumbles and I pull over to let it idle with heat blowing full blast. Cools down, I pop the hood and the coolant is boiling inside the overflow bottle. Released some pressure and I noticed...
  7. TJ Tech Forum
    Right I’m at a bit of a loss I’ve got a wrangler SE with the 2.4L and it’s only running on two cylinders, 2 and 3. Replaced the coil pack twice put new wire on and put new plugs in it and I know that there is nothing coming from that half of the coil pack cause when I took the plug wire of the...
  8. JK Tech Forum
    07 JKU. Fresh engine rebuild. Since then nothing but problems. Multiple misfire, all 4 o2 sensors coded, ignition coil a side problem . Since then a R&R ECU done. Jeep drove great home from the mechanic and since junk again. Throwing ignition coil b this time and the o2 sensors again with...
  9. TJ Tech Forum
    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...
  10. YJ Tech Forum
    I have a mostly stock (as far as i can know its only had a lift kit and 4 10 gears put in) 95 yj 4.0l manual trans. It was running great until last Thursday i went to turn left and it bucked and stalled, then proceeded to not start. It has fuel didn't have spark. Went to testing found that both...
  11. JK Tech Forum
    Hi guys my name is Mason Luna this is my first time posting and asking for help on the forum. I'm going to cut right to the chase I have a 2008 Jeep Wrangler Unlimited V6 and I have a Cylinder 4 misfire and for the life of me I cannot figure it out why it keeps misfiring, I have changed the...
  12. JK General Discussion Forum
    So I changed my battery because my old one would no longer hold a charge. Now my electrical system works, but the jeep wont start. The engine wont even turn over. Before the engine would at least turn over with my old battery. Anyone know what could be the issue? here are pics of how the new...
  13. TJ Tech Forum
    Have searched and can't seem to find a replacement connector. I have been chasing a misfire for 4 days. new injectors, cam sensor, crank sensor, TPS, IAC, plugs and coil. That fixed it... for a short time. This evening the jeep just shut down in a parking lot, i popped the hood. jiggled the...
  14. YJ Tech Forum
    I recently picked up a 1990 YJ islander edition with a 4.2 carbed. It had sat for 4 months over summer, fired up first try, and drove good the past few days. I even took it out to the trails and played in some minor puddles yesterday. It was sputtering a bit higher in the rpm but other than that...
  15. JK Tech Forum
    Greetings. After months of working on my 2007 JK Jeep Wrangler 3.8L Manual, trying to get it up and running.I have hit a dead end and have lost all my hair. Problem: Initially its all started with a cracked header which then produced enough heat to melt spark plug leads and a small portion of...
  16. TJ Tech Forum
    I'm looking for suggestions on this odd issue I'm having... 2002 Jeep Wrangler 4.0L Auto 120k Miles My TJ is my daily driver. Everyday I drive it 12 miles to and from work. Recently after about 3 miles of the journey...as I hit 50+ mph, the engine will go into a multi-misfire behavior...
  17. TJ Tech Forum
    Symptom: Jeep (97 TJ 2.5l) kicks and misses while driving. Alternator/Battery light normal for a few minutes. Then shows failure to charge. First by showing 12V instead of 14V. And then showing no charge at all. With red “check engine” light coming on. But engine stops missing and runs smoothly...
  18. JK Tech Forum
    Hi everyone, I have a 2009 jk. I ran into a problem the other day when changing my plugs and wires. Before changing them it was throwing the code for a cylinder 1 misfire and there wasn't really a huge difference in the acceleration or power of the engine just when first starting it would...
  19. TJ Tech Forum
    2000 tj 2.5L is having a sputtering/misfire issue when it gets up to running temperature. It started out as a barely noticeable sputter here and there but progressed into the jeep losing power and running at a very low rpm. I had the shop look at it so they replaced the Throttle Position Sensor...
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