misfire

Looking for help again with my 97 Jeep TJ 4.0. Within the last 300 miles, I’ve replaced the exhaust manifold, plugs, wires, distributor cap, ignition coil, upstream o2 sensor, and also went and done the heat shield on the exhaust manifold, fuel rail and injectors. I’ve been chasing a battle of a...

While on my way home from 150 mile trip, I stopped to fuel. When I started the Jeep it gave a check engine light, code reader said (cylinder 3 misfire), for context it was a mostly interstate drive, and I had been driving approximately 65- 75. It’s a 04 with inline six. I had the plugs replaced...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...