Multi cylinder misfire

[HONCHO]

Interesting - a sensor that detects - nothing! More wires - these things don't have nearly enough.
Weight - just have your steering gear replaced. That will take care of a couple of pounds if you feel your Jeep is too light.
[/Q

Bad O2 sensor? PCM out of whack.....? Lean will surge like you said.

Maybe by design ? trying to push CAFE numbers?

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[CCDANIELS]

Took my jeep in a few days ago. The dealership performed some procedure from jeep that basically reset all PCM parameters and then run the truck to 5k RPM in first gear a few times. After that drive around town for 25 miles and verify no CEL. Picked the truck up yesterday and the next day CEL and Auto stop/start are back. This is the 4th time at the dealership, no parts have been replaced yet...

 

[ShadowsPapa]

Took my jeep in a few days ago. The dealership performed some procedure from jeep that basically reset all PCM parameters and then run the truck to 5k RPM in first gear a few times. After that drive around town for 25 miles and verify no CEL. Picked the truck up yesterday and the next day CEL and Auto stop/start are back. This is the 4th time at the dealership, no parts have been replaced yet...

Just a hunch based on your post - but I think not only the dealer, but FCA, are grasping at straws. It appears as if FCA has even advised this dealer to do the "seat the rings" bit .
That many RPM in 1st - to what end? Bet they were running it up and then letting up completely on the gas pedal to force maximum vacuum.
wow, I'm surprised after all these years and the modern technology - and if it worked? It means their RINGS SUCK!! That's an old shade-tree sort of thing you might find some doing if they didn't know how to properly finish a cylinder wall or if their rings were not right for the cylinder, or the wrong rings for the cylinder wall finish or some other problem. Basically, trying to cheat their way out of it.
If they have engines fixed by that - they need to really have a chat with who-ever is in charge of engine design and production or something.

Seriously, if rings haven't broken in and sealed correctly and properly in the first few miles, few hundred TOPS, then they have a big problem.

 

[CCDANIELS]

Just a hunch based on your post - but I think not only the dealer, but FCA, are grasping at straws. It appears as if FCA has even advised this dealer to do the "seat the rings" bit .
That many RPM in 1st - to what end? Bet they were running it up and then letting up completely on the gas pedal to force maximum vacuum.
wow, I'm surprised after all these years and the modern technology - and if it worked? It means their RINGS SUCK!! That's an old shade-tree sort of thing you might find some doing if they didn't know how to properly finish a cylinder wall or if their rings were not right for the cylinder, or the wrong rings for the cylinder wall finish or some other problem. Basically, trying to cheat their way out of it.
If they have engines fixed by that - they need to really have a chat with who-ever is in charge of engine design and production or something.

Seriously, if rings haven't broken in and sealed correctly and properly in the first few miles, few hundred TOPS, then they have a big problem.

Agreed sounds like they are really not wanting to replace anything... but I understand that, I wouldnt want to throw parts at it either.... Im going to give them a couple more attempts and I'll have more than enough evidence to get it lemoned. Sad thing is I like the truck enough I'll buy another... just hope I don't get another dud....

 

[ShadowsPapa]

Agreed sounds like they are really not wanting to replace anything... but I understand that, I wouldnt want to throw parts at it either.... Im going to give them a couple more attempts and I'll have more than enough evidence to get it lemoned. Sad thing is I like the truck enough I'll buy another... just hope I don't get another dud....

You are a reasonable person.
I agree - you don't want to just throw parts into this, have the parts not make a difference and have to eat the costs. Even an hour of time is often $100 or more these days.
Now for the good news - your odds of getting another bad engine situation are not big. Of all of the JTs sold, luckily for the masses it's a small percentage with engine troubles.
That doesn't make all of those who have been dealing with this feel better, in fact likely they feel worse because of all of the people who get one of these, it has to be them (you in this case)
But even among forum members, the numbers are small in the grand scheme of things.
No comfort for those who ended up with this, I know.
Honestly, I'd be - well, I don't know how I'd be - one part of me thinks I'd be downright furious! And that's scary.

 

[CCDANIELS]

I submitted a written notice to jeep about being on my 4th (really 5th) service attempt then a jeepcares associate contacted me and the service manager I was working with. Took the jeep in on the 21st of OCT and they basically performed a different PCM flash... its been just over a week and at least 500 miles. I've had 2 auto S/S service warnings but no CEL. I still feel the truck shaking slightly at idle. Just curious do yall notice engine vibration at idle? Seems like everyone has stopped posting so they've either gotten it fixed or moved on...

 

[ShadowsPapa]

I submitted a written notice to jeep about being on my 4th (really 5th) service attempt then a jeepcares associate contacted me and the service manager I was working with. Took the jeep in on the 21st of OCT and they basically performed a different PCM flash... its been just over a week and at least 500 miles. I've had 2 auto S/S service warnings but no CEL. I still feel the truck shaking slightly at idle. Just curious do yall notice engine vibration at idle? Seems like everyone has stopped posting so they've either gotten it fixed or moved on...

Never had any errors, no check engine, no malfunction otherwise.
NEVER any vibration at idle. The only time there's anything at all that feels like a vibration is when the AC is on at idle and you can tell the compressor is running, but that's it. You have to pay attention to notice.
So I'd suggest that if it feels rough or uneven, it's not quite right.

 

[CCDANIELS]

Never had any errors, no check engine, no malfunction otherwise.
NEVER any vibration at idle. The only time there's anything at all that feels like a vibration is when the AC is on at idle and you can tell the compressor is running, but that's it. You have to pay attention to notice.
So I'd suggest that if it feels rough or uneven, it's not quite right.

Well great... I've felt this truck ONCE run so smooth i thought it wasn't running. Thats why I feel like there is still an issue. But I think their flash just made it very difficult for the CEL to come on... I just want a truck that is right. I feel like this is holding up all of my mods.

 

[JeepCares]

I submitted a written notice to jeep about being on my 4th (really 5th) service attempt then a jeepcares associate contacted me and the service manager I was working with. Took the jeep in on the 21st of OCT and they basically performed a different PCM flash... its been just over a week and at least 500 miles. I've had 2 auto S/S service warnings but no CEL. I still feel the truck shaking slightly at idle. Just curious do yall notice engine vibration at idle? Seems like everyone has stopped posting so they've either gotten it fixed or moved on...

Hello @CCDANIELS
Our team would be happy to offer you our assistance during this process. Please follow up with our private message in order to be connected to a specialist.

Kathryn
JeepCares

 

[CCDANIELS]

Hello @CCDANIELS
Our team would be happy to offer you our assistance during this process. Please follow up with our private message in order to be connected to a specialist.

Kathryn
JeepCares

Appreciate the reply, I believe my JeepCares rep is still on my case for now

 

[JeepCares]

Appreciate the reply, I believe my JeepCares rep is still on my case for now

We are happy to hear that you are receiving assistance. Let us know if you would like us to update you on your case at anytime.

Kathryn
JeepCares

 

[ShadowsPapa]

Well great... I've felt this truck ONCE run so smooth i thought it wasn't running. Thats why I feel like there is still an issue. But I think their flash just made it very difficult for the CEL to come on... I just want a truck that is right. I feel like this is holding up all of my mods.

I have to take my statement back a notch.........
While having the bypass cable connected, using jscan to see about some sort of option for trailer brake controller, I changed that setting telling it there was an integrated controller, waited a few seconds, pushed the controller button, saw the dash light up, and after a few seconds the engine was running very rough and idled way down lower than it's ever idled. After a few seconds of that it came out of it. I shut the truck off to get the dash errors cleared and it seemed fine.
I'll have to hook up with jscan again to see if there are any stored codes OTHER than what the brake controller sets in the ABS and DASM errors.

 

[Brokenteck50]

I submitted a written notice to jeep about being on my 4th (really 5th) service attempt then a jeepcares associate contacted me and the service manager I was working with. Took the jeep in on the 21st of OCT and they basically performed a different PCM flash... its been just over a week and at least 500 miles. I've had 2 auto S/S service warnings but no CEL. I still feel the truck shaking slightly at idle. Just curious do yall notice engine vibration at idle? Seems like everyone has stopped posting so they've either gotten it fixed or moved on...

Hello @CCDANIELS
Our team would be happy to offer you our assistance during this process. Please follow up with our private message in order to be connected to a specialist.

Kathryn
JeepCares

I am a retired master diagnostic teck . Been a tech for 30 years, I trained other tecks on how to diagnose p0300, never spent more than a week on a vehicle to to figure out. My gladiator has been in shop for 4 months. The factory tecks and engineers think they can diagnose a vehicle by looking at the data, in most cases that is true but not for p0300, i know what is wrong with my gladiator and as a master teck its very frustrating to me as I watch them destroy my gladiator, I'm restricted by my lawyer to say whats wrong with it, but the damage to my motor i believe was caused by a safety flaw in the cruise control system, too bad I can't talk directly to factory and tell them how to fix, hopefully in a week or two they will release me and I will post my workorders they did and show you the mistakes they keep making, I have thought about applying for a job with the soul purpose to fix my gladiator,

 

[BajaDrifter]

You are a reasonable person.
I agree - you don't want to just throw parts into this, have the parts not make a difference and have to eat the costs. Even an hour of time is often $100 or more these days.
Now for the good news - your odds of getting another bad engine situation are not big. Of all of the JTs sold, luckily for the masses it's a small percentage with engine troubles.
That doesn't make all of those who have been dealing with this feel better, in fact likely they feel worse because of all of the people who get one of these, it has to be them (you in this case)
But even among forum members, the numbers are small in the grand scheme of things.
No comfort for those who ended up with this, I know.
Honestly, I'd be - well, I don't know how I'd be - one part of me thinks I'd be downright furious! And that's scary.

Bill, reading your comment that it is only few having this problem is somewhat soothing considering everything I am reading here and in other threads. I just passed 2k miles on my JTR and no problems YET (knock on wood). How many owners do you think are having this problem, percentage wise? Any info from Jeep on this? I can't imagine them releasing that data.

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