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  1. JK General Discussion
    2013 wrangler having issues with misfire on cylinder 5, obdII scanner reads p0305 and p0300. Message board on dash reads p0201 and p2308. We have replaced plugs, coils packs, 1 injector. (Plugs and coil packs because I'm picky and bought this Jeep used, and didn't really know when the last time...
  2. JK Technical Discussion
    Hey y‘all, this morning about a quarter mile from my house the engine in my 2017 JK started riding pretty rough and threw codes P0302 (cylinder misfire) and P0202 (injector circuit malfunction). Obviously the check engine light started flashing so I turned around and drove back. I was thinking...
  3. TJ Technical Discussion
    Have had this 05 TJ for about 2.5 yrs, has had a misfire since we got it. Initially replaced the spark plugs, didn’t fix it, but it ran fine, just had gas mileage. recently started becoming very hard to accelerate, choppy idle that basically shakes the vehicle non stop. So I started to diagnose...
  4. TJ Technical Discussion
    Long detailed post ahead. Thanks for reading! 2001 TJ automatic, 4.88 gears (relevant for the speed figures below) BACKGROUND: I spent a ton of time late 2021 and half 2022 trying to troubleshoot a misfire issue. Replaced just about every sensor; Mopar replacements where possible, forum...
  5. JK Technical Discussion
    Hello everyone, I am posting to see if anyone has any suggestions or similar experiences with their JK. I have a 2011 manual wrangler 3.8 L and we started getting codes P0300 and P2305 out of nowhere the other day. Initially I thought it was plugs and wires so I replaced all of the plugs, wires...
  6. TJ Technical Discussion
    Hey all, Have had this 05 TJ for a little more than 2 years now. It has has a misfire since we bought it. Tried at first to replace the spark plugs (ended up not fixing anything and bought some shitty Bosch spark plugs, I know these engines are picky about plugs) to no avail. Recently my wife...
  7. JK Technical Discussion
    Hey Jeep community, I'm new to the forum. I was looking for some input from fellow jeepers. I've got a 2012 JK with the 3.6l Penstar. I've been getting the P0152 code (High voltage to oxygen sensor Bank 2 Sensor 1) on and off for some time now. But I've replaced that sensor twice, and the...
  8. JK Technical Discussion
    So I'm chasing a misfire on 2 code on a v6 3.6l JK. Did a compression test and found the front 2 cylinders to be around 90 or 100 while the rear 4 are around 150-160. This makes me think there is something connecting the 2 front cylinders that is leaking- even though they are in different...
  9. TJ Technical Discussion
    Okay so im stuck.. ive got an 05 tj with a 2.4 engine. The issue is it has a misfire between idle and around 2k rpm. The misfire is more prevalent when you accelerate full throttle under load. It idles just fine and runs smoothly after 2k but in that lower rpm range it will buck and hesitate...
  10. JL Technical Discussion
    Hey Everyone! I need a bit of technical advice on my JL. I had it off-road recently and went through a deep puddle (just under 30 inches / just under the maximum recommended amount). Once I got through the puddle, the Jeep started to run rough and eventually stalled out. The air filter was...
  11. TJ Technical Discussion
    Hi there for quite some time now I’ve been trying to find what hoses go to my purge solenoid and I can’t figure it out. I have a 2.5l 1997 tj that has been misfiring with the p0441 code and I would like to fix it. I think the problem is the purge solenoid but there are no hoses running to it. If...
  12. JK Technical Discussion
    for some time my jeep will jolt when accelerating. brought it in to the mechanic and their computer could find no error; because the 'jolt' happened so irregularly. Yesterday I was driving on the highway, and it jolted, going about 80 (I was getting off the highway). right after it jolted, the...
  13. JK Technical Discussion
    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...
  14. JK General Discussion
    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...
  15. TJ Technical Discussion
    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...
  16. JK Technical Discussion
    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...
  17. 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...
  18. JL 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...
  19. TJ Technical Discussion
    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...
  20. JK Technical Discussion
    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...
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