misfire

  1. Tojeepornottojeep

    P0339 & P0300 codes

    I have 2005 tj 4.0 auto keep getting codes p0339 & p0300 I have changed the camshaft and crankshaft sensor, full service change of plugs & oils etc, injector clean and currently have a ignition capacitor on order hoping that would be the weak link. it runs smooth when start up and idling...
  2. M

    Misfiring problem

    I have a 1999 Jeep wrangler Sahara with the 4.0 in it. It started to misfire on me so I replaced all the ignition coil, plugs, and cables (one broke) but it is still missing. I’m doing my own research but hope you guys can help. If I take it on the road it spits and sputters but if I jump on the...
  3. Meatlord

    Late model 4.0 missfire issues discussion

    Back story, I bought an 06 Rubicon 6spd from a local with a misfire issue for a reasonable price. I'm no stranger to jeeps or the 4.0 engine either. 200k miles, look to be all road miles, PO was surprised on the test drive when I got the diff lock lights to come on... This condition exists...
  4. C

    Engine sputtering and misfiring

    Good evening Jeep experts. Jeep rookie here. Was trying to find a thread that was close to my problem. 1998 TJ 4.0. 51k miles. Was miss firing and throwing a misfire code, reset that code, continued with a new code misfire multiple cylinders. Changed all plugs (they were original plugs) with...
  5. racecar825

    P0301 misfire at idle (puffing noise at muffler)

    As the title says, I have a misfire on cylinder 1 at idle. It's a 1998 4.0 with 165k miles. I can feel slight vibrations while in the car and it is idling. I had this code a few months ago and changed the plugs, coil wires, distributor cap, and the distributor rotor and the problem went away...
  6. M

    Confusing misfire

    Hi all, I have 1999 4.0 sport - has run perfectly for years, however recently it has developed a misfire when first driving the car. No issue starting the car but once I get off the drive and take it up the road it pops and bangs and judders until I floor it and it all seems to clear and then...
  7. T

    Help with P0306 misfire code on 2006 Jeep Wrangler 4.0

    2006 Jeep Wrangler X 4.0 6-speed I have the dreaded misfire. The weird thing is it will occasionally go away and then come back. I can tell when it's going to come back because it gets noticeably rougher. I have tried changing out spark plugs, changed the ignition pack, new 4-hole Bosch fuel...
  8. smash_lizard

    Consistent misfire - cylinder 4 only

    2002 2.5L. Headgasket/head rebuilt July 2019. Since wheeling season around here ended in December the jeep has been sitting on its trailer and only been started once in February. At that time there were no issues and it ran normally. This past weekend it was pulled off the trailer in...
  9. wheelnmac

    2000 4.0 TJ misfire issues

    So here is the long version. I was on my way to the desert with my trailer in tow and the Jeep quit on a hill. Got it towed home and replaced the crankshaft position sensor. Nothing. Drained the fuel and replaced the pump. Bingo. Fast forward to last week. The jeep has been sitting. Starting it...
  10. Mitch8801

    2002 Jeep Wrangler TJ with glowing red cats

    Hey Guys, So recently I was on my way home and at a stoplight had a misfire in cylinder 2, and my exhaust sounded funny and fluttery, I was like 8 minutes away so I decided to drive it home and coast down hill. Long story short, I replaced the spark plugs, still had issues. I checked my coil...
  11. BoldlyGoing

    Low Fuel Pressure and Cylinder 3 Misfire Codes P0300 and P0303

    So, after months of weird stuttering under acceleration, and occasional obvious misfires, my LJ is finally spitting a code (or rather 2). P0300 and p0303. Now, in addition to the symptoms mentioned before, I've noticed in the last few days that the engine will "stick" at ~1000 rpms or so till...
  12. R

    Random misfire between cylinder 2 and 3 on 2006 Rubicon

    Ok gentlemen, Iam back chasing a new issue. This one may stump as I have taken most actions possible, and couldn't find a similar post. If i break any forum rules let me know and it will be fixed. 06 Jeep Wrangler Rubicon with a brand new engine. Problem: Random misfire usually between...
  13. J

    01 4.0 misfire on all cylinders except #6

    Hi all need help on where to begin. 01 4.0 165k. Drove 60 miles 1 way yesterday no problem. Untill I got on expressway heading home, check engine light started flashing the whole way it started shaking a little but was barely noticeable at 60. Got off my exit and it was running terrible. No...
  14. A

    P0302 and P0305 cylinder misfires

    I have a 2003 Jeep wrangler Sport, 6 Cylinder motor. Ive had it for around 5 years, at about 140,000 miles today! Huge problem, yet to find a solution! Keep getting codes p0302, p0305. - Ive replaced the spark plugs, no results. - I replaced the coil pack, with a new one from the dealership...
  15. R

    98 TJ 2.5 Engine / Misfire Issues

    Hey Jeepers, My 1998 Wrangler TJ 2.5L Auto has been giving me some issues while driving. Recently, the engine has been giving me a sort of lag as I accelerate, more specifically within the 35-50mph range. Also, when pushing gas and pushing past 3000rpms, my Check Gauges light would pop on...
  16. fourmustangs

    P0300 code and oil pressure gauge drops to zero at idle

    Because Jeep...... I have a P0300 code so its multiple misfies...but that is only code so doesnt specify a a cylinder. It doesnt run bad...it occasionally has a shimmy in the engine...would that be a whole coil pack to replace or still could be a vacuum leak? 2nd issue The oil gauge will...
  17. Z

    Cylinder 3 misfire and P0303 code

    I have a 2002 straight 6 TJ. Been driving it about 200 miles each weekend from Nash to Knox. Recently, started it up and it idled rough then check engine light flashed. Code was p0303. 3rd cylinder problem, first thing I did was replace the spark plug and I am getting the same code. Heard I...
  18. fourpointzero

    P0330 Code - Please Help!

    Hi gang, I'm helping a buddy of mine diagnose some codes on his 2005 TJ Wrangler X. One of the three codes he's throwing is 'P0330' and every search seems to indicate a 'knock sensor' yet, I keep reading (all over the web - including some posted by Jerry B) that there's no such thing on the...
  19. CUT23

    P0306 Cylinder Misfire Code

    I recently got my 2006 LJ back on the road. Of course it failed inspection. Had cracked front and rear manifolds - replaced. I then started getting the code for 6th Cylinder Misfire. The plugs and coil have been replaced and the fuel system was cleaned. Still getting the code. The...
  20. Ian

    New from North Dakota: P0303 code and cylinder 3 misfire

    I have a 2005 TJ 4.0 and I joined for some help. I have a P0303 code which is cylinder 3 misfire. Things I have done so far include all new spark plugs, new coil rail, new o2 sensors, swapped the first fuel injector with the third fuel injector, and a new crank position sensor. Only thing I can...