misfire

Hey gang, I'm at my wits end, mostly cuz I'm scared of what's happening to my dream Wrangler. Sorry if this post seems long but I want to provide as much details as possible so hopefully someone can point me in the right direction. So here is a little backstory and info: About 5 months ago, I...

I'll be driving along with the engine hot and it misfires under steady throttle causing the whole car to jolt. The tach needle drops a few hundred and then shoots right back but there are never any codes. This problem has been happening over the past couple of years, it'll misfire here and...

Hey all! I have a 1997 TJ 5sp manual 4.0L I just replaced pistons, piston rings, some bearings, and gaskets all around (except the oil pan gasket). this project took way too long and I was getting excited to have her back on the road. after putting everything together and getting her running and...

Ok I have a 2006 Rubicon 6 speed with an intermittent misfire issue that I’ve been chasing for over a year. I’ve lost lots of money and sleep over this one and I can’t find an end in sight. The jeep will run perfectly all day long and then once you put the engine under heavy load ex. (Flooring...

This started after an off-road trip on the way back had a really bad misfire in cylinder one. So bad I had to end up towing it home. Ended up replacing the spark plugs, and that fixed it for a while. They were really poorly gaped (i didn’t know gapping was a thing lol). To sure things up I...

Have an 05 TJ 4L I6. Had a misfire issue when I bought in 2020, let it run until it started having major problems with the following: acceleration on the highway, idling rough, multiple turns of the key to start. When I first got it, replaced the starter and spark plugs (used autolite plugs like...

Hello everybody, I've been visiting the forum for years and have learned so much through this amazing site, and I finally am coming to you guys about an issue I've been having for years now. While I want to provide as much information as possible, I will keep it as brief as possible. I hope you...

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...

I have a 2004 TJ Rubicon with the 4.0 and automatic (42RLE). About 4 years ago, I was having shifting issues between 1st and 2nd where it felt like a slip/missed the gear, but would only do it once in a blue moon (never threw a code), and would shift into 2nd after about 1-2 seconds of...

Hello TJ Forum, I have been trouble shooting my 01 TJ with 59k miles for the last year or so and cannot seem to find the cause of its issues. The Jeep has an idle around 500rpm and once put into gear there is an immediate difference in the vibration at stand still; the vibration goes away once...

Hello everyone, I have a 1998 Jeep Wrangler 4.0L, I have a check engine light on and it’s giving me the following codes: P0300- multiple/ random cylinder misfire P0301- cylinder 1 misfire P0302- cylinder 2 misfire Anyone know what my issue may be? Been trying to fix this on my days off from...

1998 wrangler 4.0 Misses like crazy upon start up. Kinda levels out a little bit while idling. Rev it up around 2k or so and it back fires and pops like crazy. New distributor & cap/rotor. New wires. Plugs are gapped. Fuel is at 49psi and holds. I have spark from the coil. I read that on of...

2004 Jeep Wrangler 4.0 Hello guys, first time ever posting in a forum so I'll jump right into the issue. In the past week it's been below 0° in the mornings, when I start my jeep on the cold mornings I get a misfire out of cylinder 2 and 3, once the engine warms up it seems to run fine, maybe a...

My ‘01 TJ Sport 4.0 seems to burn thru Coil Packs lately. My TJ started rough idle after start following a 20+ minute stop after warming up and NO codes. Usually it would smooth out and drive great. Cold startups were perfect. One thing of interest is the 4.0 engine runs very hot. The hood...

Some ideas of P0171 specificlly with less power at acelerate, just a little bit, like a missfire. This issue is intermitente until now, but if something need maintenance I want to prevent any bigger issue. My mechanic will do in 2 more days maintenance to injectors and all throttle body...

Hi from Rome, Italy where I converted my 1999 Jeep Wrangler 4.0L in a LPG powered to pass emission restrictions here and run everyday as a daily driver in city centre. I decided to make this post cause I can't really figured out the problem after many attemps. Symptoms are some little random...

So this morning, my Jeep started misfiring like crazy and had the check engine light start flashing. When I got it back home, I went to check the code and the obd2 would not connect to my scanner as well as the "no bus" code on the odometer. I have had to park my Jeep in the grass the last few...

Engine has been running slightly rough, audible random misfiring (no misfire codes), slight shaking of the vehicle and P0201 was tripped. Inspected the wiring on injector 1 and found exposed wires. Further inspection of other electrical connections (other 5 fuel injectors) look similar with...

Firstly apologies, I’ve posted quite a bit about this in the past but I’m at a loss and don’t really know what else to do. So here I am again , I’ve had some major issues with my 2004 4.0 Auto TJ that I’ve posted extensively about and had some really helpful conversations about , but...

Recently we had a water pump replaced on a 2004 Jeep 4.0L The next day it started misfiring on Cylinder 1. The engine never overheated and two shops agree there are no signs it overheated. The new shop is telling is the below and provided the video/photos. Misfire is not present under load at...