Survey- For those with misfire issues

[P0300!]

Final Update!

Annnnd... I'm done. I just couldn't deal with it anymore. I had it for about 3 months, and it spent more than half of that time in service. You know it's a POS when your vehicle has more engines than car washes, and the majority of miles are service techs test driving and troubleshooting.

The list of issues was increasing, and I just don't have time or patience for that with a new vehicle. Hands down, the Jeep Gladiator is the least reliable vehicle I ever owned. My 10 year old Land Rover required significantly less maintenance than a new $55,000 Jeep.

Jeep corporate was useless and not present through this whole process. Apparently a Jeep needing a new engine before it's first fill-up doesn't warrant any customer interaction.

So I'm done... just got rid of it.

Good luck everyone.

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[Hootbro]

Final Update!

Annnnd... I'm done. I just couldn't deal with it anymore. I had it for about 3 months, and it spent more than half of that time in service. You know it's a POS when your vehicle has more engines than car washes, and the majority of miles are service techs test driving and troubleshooting.

The list of issues was increasing, and I just don't have time or patience for that with a new vehicle. Hands down, the Jeep Gladiator is the least reliable vehicle I ever owned. My 10 year old Land Rover required significantly less maintenance than a new $55,000 Jeep.

Jeep corporate was useless and not present through this whole process. Apparently a Jeep needing a new engine before it's first fill-up doesn't warrant any customer interaction.

So I'm done... just got rid of it.

Good luck everyone.

So what happened with the replacement engine?

What were your other issues?

Did you lemon law it or kick the can down the road and trade it off?

 

[Plasterboard]

2022 Mojave here.

I had the common misfire issues. Started off around 500 miles as a flashing CEL for 10-15 seconds, then it went off. Happened every so often (every 500 or so miles). Eventually around 2000 miles it flashed and just stayed on. Code reader gave a generic P0300 code. Dealer said codes weren’t storing, but my reader showed the codes. Eventually dealer saw the codes though.

A few days ago dealer did a TSB 18-071-22 PCM update and so far it seemed to make the CEL go off and it hasn’t come back on, knock on wood.

I can’t find anything on google about TSB 18-071-22, so maybe it’s new.

 

[ShadowsPapa]

2022 Mojave here.

I had the common misfire issues. Started off around 500 miles as a flashing CEL for 10-15 seconds, then it went off. Happened every so often (every 500 or so miles). Eventually around 2000 miles it flashed and just stayed on. Code reader gave a generic P0300 code. Dealer said codes weren’t storing, but my reader showed the codes. Eventually dealer saw the codes though.

A few days ago dealer did a TSB 18-071-22 PCM update and so far it seemed to make the CEL go off and it hasn’t come back on, knock on wood.

I can’t find anything on google about TSB 18-071-22, so maybe it’s new.

Not new. Originally from April 2022 and also came an RSU or rapid transmittal aimed at specific VNIs

 

[IanNubbit]

Just want to state here. I’ve had a 2020 JT with a bad cam for P0300, I’ve seen 2021 with P0300 fixed by the PCM update. Working on a 2022 and nether fixed it. So this isn’t that simple as “here’s problem, here’s fix” very curious to see what’s wrong with this 2022, but just want to get that out there so everyone understands why this isn’t just fixed already

 

[ShadowsPapa]

Just want to state here. I’ve had a 2020 JT with a bad cam for P0300, I’ve seen 2021 with P0300 fixed by the PCM update. Working on a 2022 and nether fixed it. So this isn’t that simple as “here’s problem, here’s fix” very curious to see what’s wrong with this 2022, but just want to get that out there so everyone understands why this isn’t just fixed already

Finally.
I've been saying that for months - every time someone has a misfire they come and ask "what's the fix for a misfire".
Gee, it wasn't THAT easy in 1975, it sure isn't going to be in 2022.
The fix is to take care of whatever caused either the fuel mixture imbalance, or the ignition issue that didn't get the charge lit when it should have been, could be mechanical as well.

The misfire on my wife's 2021 3.6 at 900 miles was ........ spark plugs. Go figure.
The misfire on my 2022 3.6 was likely resolved by: drive it a while and put fresh tank of gas in it.
It hasn't set the CEL since I put the first tank of gas in it 6 weeks ago. It's been smooth, no misfires you can feel since that evening.
When I cleared the misfire pending instances in the system, I've not seen them come back.
I will say that #2 still has what I personally consider an abnormally high number, followed by #4, but it's normally on starts when the engine is either cold or not up to operating temperature and if I wasn't monitoring things, I'd never know about those as I only see them in a live feed when I start and drive it.

But ya know what - to this day on fakebook in the car areas, worse with AMC people, especially Eagle owners, I swear - my engine is running rough - how can I fix this? Will this other carburetor work? And then you get 10 people saying yeah, those stock carbs are junk, put a 2100 on it, that will solve it.
Where's that slap forehead icon or the bang head against wall icon.

 

[Idlethunder]

After having the cylinder 4 misfire code cleared and the PCM updated on my 2022 3.6 Rubicon over a month and 1,100 miles ago, the CEL came back on today. It shows code P0300 for random multiple cylinder misfires. I am taking it in next Wednesday to let the dealer see if they can find anything and hopefully come up with a solution. This happened during the 2 mile drive this afternoon between the house and office. CEL was flashing at first while driving around 10 mph but after about 30 seconds just stayed on. What seems strange to me is that when I pulled up to a stop sign the engine shut off like I’d hit the start button. After shifting to park and hitting the button it fired right back up with the CEL on but I had no trouble getting the last mile to work. At the time the light came on I was monitoring for misfires with Jscan but it had only shown 11 total across 4 cylinders which is unusual because there are usually at least 30 during the first few minutes of driving. Attached is a screenshot of the misfires and freeze frames from both Jscan and OBDlink. I did not ever feel or hear anything at all unusual from the engine. Had the light not come on or the engine shut off at the stop sign, I would not have noticed anything unusual.

 

[ShadowsPapa]

After having the cylinder 4 misfire code cleared and the PCM updated on my 2022 3.6 Rubicon over a month and 1,100 miles ago, the CEL came back on today. It shows code P0300 for random multiple cylinder misfires. I am taking it in next Wednesday to let the dealer see if they can find anything and hopefully come up with a solution. This happened during the 2 mile drive this afternoon between the house and office. CEL was flashing at first while driving around 10 mph but after about 30 seconds just stayed on. What seems strange to me is that when I pulled up to a stop sign the engine shut off like I’d hit the start button. After shifting to park and hitting the button it fired right back up with the CEL on but I had no trouble getting the last mile to work. At the time the light came on I was monitoring for misfires with Jscan but it had only shown 11 total across 4 cylinders which is unusual because there are usually at least 30 during the first few minutes of driving. Attached is a screenshot of the misfires and freeze frames from both Jscan and OBDlink. I did not ever feel or hear anything at all unusual from the engine. Had the light not come on or the engine shut off at the stop sign, I would not have noticed anything unusual.

Wasn't even close to warmed up - basically still a cold engine.

Interesting to note that your higher misfires (although low) are the same cylinders mine were - 2, then 4 and 6 had a few more than the odd numbered cylinders. But 2 was always the most, followed by 4.

 

[Idlethunder]

Wasn't even close to warmed up - basically still a cold engine.

Interesting to note that your higher misfires (although low) are the same cylinders mine were - 2, then 4 and 6 had a few more than the odd numbered cylinders. But 2 was always the most, followed by 4.

When the light came on after lunch, it had sat in the driveway for almost half an hour after driving 2 miles home from work. Before that it had been parked at the office for around 4 hours. I have noticed considerably fewer to 0 misfires when I can let the engine warm up for several minutes before driving. The vast majority happen within the first couple of minutes after it is put into drive if it hasn’t idled very long. Problem is that I have half an hour for lunch and if I'm busy I don't always let it warm up long enough. After the service department looks it over next week, I will do my best to let it run longer before driving.

When I first started monitoring misfires in July, it was always cylinder 4 with the higher count followed by 2 then 6. The past couple of weeks though it has been a tossup each time I drive if 2 or 4 will have the most with cylinder 2 having slightly more overall. Attached is the screenshot of the 2 mile drive home after work. Before I left, I let it warm up for 5 minutes before pulling out the gate. All but 3 of these misfires happened within the first 30 seconds after putting it in gear.

 

[ShadowsPapa]

When I first started monitoring misfires in July, it was always cylinder 4 with the higher count followed by 2 then 6. The past couple of weeks though it has been a tossup each time I drive if 2 or 4 will have the most with cylinder 2 having slightly more overall. Attached is the screenshot of the 2 mile drive home after work. Before I left, I let it warm up for 5 minutes before pulling out the gate. All but 3 of these misfires happened within the first 30 seconds after putting it in gear.

That shot looks like mine did a month or so ago. #2 followed by #4 and 6 trailing behind but still more than 1, 3 or 5 which had 0 most of the time.

With the short drives - the batteries will never be fully charged. Unless you take it on some long long drives, you're going to need to put a battery tender on it. 2 miles is extremely hard on vehicles and won't keep batteries up. In fact, even just 10-15 minute drives is very hard on them and won't keep batteries up - even back in the 70s it was never enough to keep batteries up or let engines warm up.
The engine needs to reach operating temperature and then be driven for another 20 minutes to properly purge out moisture and acids. It often takes 8 - 10 miles for mine to get all things to operating temperature.

 

[Idlethunder]

That shot looks like mine did a month or so ago. #2 followed by #4 and 6 trailing behind but still more than 1, 3 or 5 which had 0 most of the time.

With the short drives - the batteries will never be fully charged. Unless you take it on some long long drives, you're going to need to put a battery tender on it. 2 miles is extremely hard on vehicles and won't keep batteries up. In fact, even just 10-15 minute drives is very hard on them and won't keep batteries up - even back in the 70s it was never enough to keep batteries up or let engines warm up.
The engine needs to reach operating temperature and then be driven for another 20 minutes to properly purge out moisture and acids. It often takes 8 - 10 miles for mine to get all things to operating temperature.

My driving distance may very well be part of the problem. I am averaging about 1000 miles a month but most of my daily driving is 5 miles or less at a time. Four to six times each week I go to town and depending on what I do those drives are 35 to 45 miles round trip. Every time I’ve monitored the drive home, there are 0 or very, very few misfires. Once it gets up to temperature it is fine but there are always several after a cold start. Would using an engine block heater help?

 

[Pedal Metal]

My driving distance may very well be part of the problem. I am averaging about 1000 miles a month but most of my daily driving is 5 miles or less at a time. Four to six times each week I go to town and depending on what I do those drives are 35 to 45 miles round trip. Every time I’ve monitored the drive home, there are 0 or very, very few misfires. Once it gets up to temperature it is fine but there are always several after a cold start. Would using an engine block heater help?

You shouldn’t have to resort to an engine block heater in the summer time, especially noting you're in Oklahoma. Engines can come up to heat quite quickly just at idle. Sure, there may be cold start conditions that trigger this event, but we’re not at a new place with the internal combustion engine here. So, Engineering should be tasked to design a better warm up procedure, or determine more precise specifications on the integration of spark plugs, wires, coil packs, computer Systems, integrated chips and / or algorithms! I understand that things break and problems occur. I make my living off of fixing problems. However, I don’t understand going to a certified FCA shop about this same problem twice and being told, we contacted STAR and we can’t recreate the issue, but they suggested that we change the oil and when I go to pick it up I’m told that I should monitor it and bring it back if it happens again. What I expect to hear them say is ”All I’m doing is contemplating the ifs.” “You ain’t got no problem (Mr. insert your name here), I’m on the m-f’r … and wait for the WOLF which should be coming directly!”

 

[Idlethunder]

You shouldn’t have to resort to an engine block heater in the summer time, especially noting you're in Oklahoma. Engines can come up to heat quite quickly just at idle. Sure, there may be cold start conditions that trigger this event, but we’re not at a new place with the internal combustion engine here. So, Engineering should be tasked to design a better warm up procedure, or determine more precise specifications on the integration of spark plugs, wires, coil packs, computer Systems, integrated chips and / or algorithms! I understand that things break and problems occur. I make my living off of fixing problems. However, I don’t understand going to a certified FCA shop about this same problem twice and being told, we contacted STAR and we can’t recreate the issue, but they suggested that we change the oil and when I go to pick it up I’m told that I should monitor it and bring it back if it happens again. What I expect to hear them say is ”All I’m doing is contemplating the ifs.” “You ain’t got no problem (Mr. insert your name here), I’m on the m-f’r … and wait for the WOLF which should be coming directly!”

I completely agree with you. If this was my last Ford, and I really liked that truck, I'd say the hell with it after a few months and trade it off. The problem is that I love this thing and am willing to do anything I can, within reason, to help the situation. Before coming back to work after lunch, I let it idle for almost 10 minutes while following the temps thru the off road app. The coolant, oil and transmission were all up close to operating temp when I left the driveway. The misfires on the attachment all still came up within the first half mile after putting it in drive and that is unusual. Normally after idling for that long, there will be very few if any misfires. After being parked for about an hour, I had to run to town for work and the CEL is now off. I haven’t had a chance to check yet but hopefully the p0300 code is stored.

 

[Gatorized]

It sounds like you are babying your truck When you should be riding it hard and putting it away wet - other wise you will be out of warranty and no resolution.

 

[Idlethunder]

It sounds like you are babying your truck When you should be riding it hard and putting it away wet - other wise you will be out of warranty and no resolution.

It isn’t that I baby it although adding a block heater would qualify, I am just trying to figure it out. Most of my drives are short, less than 5 miles but I am off road daily and I drive a route of about 40 miles four or more times a week. A couple of times a month, I drive almost 400 miles pulling a trailer. If we had gotten any rain the last couple months, both hi and low four wheel would also be used but as dry as it’s been, it hasn’t been out of two wheel drive lately. During the last month and a half I have tried running it hard and taking it easy but neither has had an effect on the misfires. The only thing that has consistently cut them down has been letting it warm up for several minutes before putting it into gear but the last couple of days that hasn’t mattered either as shown on the screenshot. After work tonight I let it warm up for 15 minutes. Not a single misfire until it was put into drive and this was after half a mile of driving.

The CEL is off now but the code was stored so hopefully they can find something when I take it in next week.

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