WTF is going on with my new Jeep??

[BAULSAUL]

Took it in for service a few weeks ago. There is a misfire on cylinder one. The tech swapped it out with number three and things were good. Skip to this week and it has same exact issues. This thing is shaking like a son of a bitch. I will attach photos of my scan. Look at cylinder #1. I don’t know what else on here looks bad because I don’t understand most of it. But if you happen to know, something that I don’t, please share it with me. It happens at all speeds. Comes and goes but it sounds horrible.

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[Lunentucker]

At a glance, what they tried didn't work, and there's an issue with cylinder 1 still.
Did they swap the plug and the coilpack?

 

[Minty JL]

Could also be a bad injector

 

[ShadowsPapa]

Could also be a bad injector

I'll fix that for ya -

Could also be a bad injector or any of a dozen or more other things...........

I wish people would stop assuming that all misfires are caused by the same thing. Even a majority aren't necessarily related.
The thing about coil packs and other pieces - sure, a simple fix if that's it, and it's fine for a novice to "try" but for a pro to just swap out parts without actually applying real diagnostics and troubleshooting? Might as well do what the classic car people do - car won't start is the question. The answer is "bad starter". So they put on a starter. Car still won't start. Next answer is "bad battery" so they buy and put in a battery, next is the alternator, and finally someone asks the right question - gee, it's out of gas. Yeah, I see that stuff out there. They didn't ever ask "does it crank but not fire or start?".
And the unwitting person asking just starts throwing money and parts at it.

The tech swapped it out with number three and things were good. Skip to this week and it has same exact issues.

The tech swapped what out? Coil pack? Spark plug? Injector?


-----------------------------
Ya know - a scope could go a long long ways to diagnostics, also - these will report if it's an IGNITION misfire.............
In the case below - it was a weird thing that stopped misfiring by the time it got to the dealership but I had enough recorded that they actually figured it out - spark plugs. One visit, fixed.

2021/01/04 11:56:35.970: Faults found: P0303
Error code: P0303
Cylinder 3 ignition failures
Test not complete
Error intermittent
Error warning lamp not requested
CARB Freeze Frame:
___________________
Fault code: P0303
PCM Mileage since MIL On: 0.00 miles
PCM Odometer: 950.27 miles
Open Loop - Bank 1: No
Closed Loop - Bank 1: Yes
Open Loop due to Driving Conditions - Bank 1: No
Open Loop with DTC - Bank 1: No
Closed Loop with DTC - Bank 1: No
Open Loop - Bank 2: No
Closed Loop - Bank 2: No
Open Loop due to Driving Conditions - Bank 2: No
Open Loop with DTC - Bank 2: No
Closed Loop with DTC - Bank 2: No
Engine load: 30.20 %
Freeze Frame Engine Coolant Temp: 66.00 Deg.C
Intake Air Temperature: 215.00 Deg.C
Ambient Air Temperature: 12.00 Deg.C
Short Term Fuel Trim - Bank 1: 12.49 %
Long Term Fuel Trim - Bank 1: -3.13 %
Short Term Fuel Trim - Bank 2: 9.37 %
Long Term Fuel Trim - Bank 2: -7.04 %
MAP Voltage: 1.96 V
MAP: 46 kPa
Atmospheric pressure: 97 kPa
Engine RPM: 875.00 rpm
Vehicle speed: 0 MPH
Throttle Position Sensor 1 Percent: 12.94 %
Battery voltage: 14.58 V
Fuel level: 95.69 %
Purge Solenoid Current: 0.00 mA
Purge Duty Cycle: 0.00 %
Idle Air Control (IAC) Current: 0.00 mA
Idle Air Control (IAC) Duty Cycle: 0.00 %
EGR Flow: 0.00 g/s
Current Adaptive Cell ID: 24
Spark advance: -2.00 Deg
AC Clutch: Disengaged
EGR Gassed Flowing: No
Power Steering High Pressure: No
AC Switch: Off
PRNDL in Gear: No
Brake switch: Pressed

Here's from my 2022 JT - It was a CCDIFF issue, they forced a cam/crank difference relearn and fixed it for good.

 

[BAULSAUL]

That’s all he did. Was change the plug-in coil. I don’t know if they changed it out with new ones or not but that’s all that was done the first time around. This time mine did the same thing yours did. It stopped shaking right before I pulled into the dealership, but I was able to get all of these Screenshots. I sent those in this morning so they at least have them.

 

[ShadowsPapa]

That’s all he did. Was change the plug-in coil. I don’t know if they changed it out with new ones or not but that’s all that was done the first time around. This time mine did the same thing yours did. It stopped shaking right before I pulled into the dealership, but I was able to get all of these Screenshots. I sent those in this morning so they at least have them.

That one that indicated ignition misfire - that was my wife's then 2021 Grand Cherokee with only 800 miles on it. It bucked so badly I thought something was busted. I mean it BUCKED hard when in gear moving, and when just sitting in the driveway gathering information it jumped and misfired and I was almost afraid to drive it. I made sure I had my cell phone with me in case.
By the time I got up to the exit for I35 north to Ankeny, the thing had smoothed out and was purring like a kitten by the time the service writer came over. I had the printouts and handed them to him and explained how it started happening, when and where it smoothed out, that sort of thing. He started looking over my reports and walked over to a desk and soon a tech came out and was wondering what the huddle was about. Then another and another. Soon there were like 5 guys there looking at the reports. Finally the service writer started walking over to me and asked "how did you get all of this? this is stuff normally only our techs get with our equipment". I explained.............. at that time for that report it was AlfaOBD and I'd captured multiple CARB Freeze Frames using that software. It detailed everything about the engine at the time of the misfire. I left the GC with them and they later said they had only been able to get it to misfire one time but because of the reports I had given them they had enough info they could continue under warranty and dug until they found what they said at that time was an obscure TSB about spark plugs. Apparently it had just come out, no one there had ever experienced the issue before. Of course you have to take a few things apart to get to the spark plugs on the one side so it took them a couple hours once they decided to follow that course but they followed the TSB, replaced spark plugs and that was that.

Too bad your JT isn't a 2021 as that's the year that spark plug TSB covers.

 

[BAULSAUL]

I forwarded all the same info you did. Literally the same situation and I’m glad I had taken screenshots. I sure hope it helps a little bit. Engine light was still on but I don’t know what codes were on there. Mine smoothed out and I was like wtf. With that said, I sure hope they can figure it out this time. I’ll let you know. It’s been such a frustrating experience. I just want to enjoy the vehicle. My kid loves this truck too. She’s only 2 but she’s so happy when we go for rides.

side note, I was kind of pissed off about the driver seat. The weather is all messed up, and somebody had mentioned it was normal.

 

[BAULSAUL]

I forwarded all the same info you did. Literally the same situation and I’m glad I had taken screenshots. I sure hope it helps a little bit. Engine light was still on but I don’t know what codes were on there. Mine smoothed out and I was like wtf. With that said, I sure hope they can figure it out this time. I’ll let you know. It’s been such a frustrating experience. I just want to enjoy the vehicle. My kid loves this truck too. She’s only 2 but she’s so happy when we go for rides.

side note, I was kind of pissed off about the driver seat. The weather is all messed up, and somebody had mentioned it was normal.

That one that indicated ignition misfire - that was my wife's then 2021 Grand Cherokee with only 800 miles on it. It bucked so badly I thought something was busted. I mean it BUCKED hard when in gear moving, and when just sitting in the driveway gathering information it jumped and misfired and I was almost afraid to drive it. I made sure I had my cell phone with me in case.
By the time I got up to the exit for I35 north to Ankeny, the thing had smoothed out and was purring like a kitten by the time the service writer came over. I had the printouts and handed them to him and explained how it started happening, when and where it smoothed out, that sort of thing. He started looking over my reports and walked over to a desk and soon a tech came out and was wondering what the huddle was about. Then another and another. Soon there were like 5 guys there looking at the reports. Finally the service writer started walking over to me and asked "how did you get all of this? this is stuff normally only our techs get with our equipment". I explained.............. at that time for that report it was AlfaOBD and I'd captured multiple CARB Freeze Frames using that software. It detailed everything about the engine at the time of the misfire. I left the GC with them and they later said they had only been able to get it to misfire one time but because of the reports I had given them they had enough info they could continue under warranty and dug until they found what they said at that time was an obscure TSB about spark plugs. Apparently it had just come out, no one there had ever experienced the issue before. Of course you have to take a few things apart to get to the spark plugs on the one side so it took them a couple hours once they decided to follow that course but they followed the TSB, replaced spark plugs and that was that.

Too bad your JT isn't a 2021 as that's the year that spark plug TSB covers.

 

[BAULSAUL]

Driver seat leather I meant. Other pic is the passenger side.

 

[Outback_Joe]

Has the dealer taken a look at the inside of Cyl. 1 ? They should have a borescope around the shop since they are relatively cheap today. Just a way to verify if anything looks like a problem inside.

 

[BAULSAUL]

They will be doing that today for sure. 2nd visit for same exact issue. Should have the first time. This time is was much worse. And they know if it comes back one more time, they have to buy it back. I don’t want that. But I don’t want a lemon either.

 

[Lunentucker]

Swapping the coil pack and plug with the adjacent cylinder was a logical step.
They separated ignition from cylinder to see if the problem moved with the coil pack and plug.
It didn't. Since it stayed on the same cylinder I would very much doubt that it's a spark plug issue.

I got lucky on mine. Mine was doing the same thing, and somehow when they swapped the plug and pack, everything got right.
It did it with me running 80 in the far left lane of a very busy four lanes.
Damned thing felt like it was going to throw the engine into orbit.

Keep us posted. It's always helpful to learn the fix.
Maybe a wire got rubbed and is grounding.

 

[BAULSAUL]

I hope to find out soon. I’ll be sure to keep you posted.

 

[BAULSAUL]

First time it went in for this issue a couple weeks ago, they had already changed 1 over to 3. So when I find out they did the same exact thing, it makes me wonder why they did it a 2nd time.

it was a Saturday and today is their day off. So I’m really hoping that they get on it first thing tomorrow. I will not rush them. But the longer it takes, the more concerned I become. I don’t mean to come off as Mr.Negativity, but I’ve had bad luck with stellantis.

 

[David T Hopkins]

I'll fix that for ya -



I wish people would stop assuming that all misfires are caused by the same thing. Even a majority aren't necessarily related.
The thing about coil packs and other pieces - sure, a simple fix if that's it, and it's fine for a novice to "try" but for a pro to just swap out parts without actually applying real diagnostics and troubleshooting? Might as well do what the classic car people do - car won't start is the question. The answer is "bad starter". So they put on a starter. Car still won't start. Next answer is "bad battery" so they buy and put in a battery, next is the alternator, and finally someone asks the right question - gee, it's out of gas. Yeah, I see that stuff out there. They didn't ever ask "does it crank but not fire or start?".
And the unwitting person asking just starts throwing money and parts at it.



The tech swapped what out? Coil pack? Spark plug? Injector?


-----------------------------
Ya know - a scope could go a long long ways to diagnostics, also - these will report if it's an IGNITION misfire.............
In the case below - it was a weird thing that stopped misfiring by the time it got to the dealership but I had enough recorded that they actually figured it out - spark plugs. One visit, fixed.

2021/01/04 11:56:35.970: Faults found: P0303
Error code: P0303
Cylinder 3 ignition failures
Test not complete
Error intermittent
Error warning lamp not requested
CARB Freeze Frame:
___________________
Fault code: P0303
PCM Mileage since MIL On: 0.00 miles
PCM Odometer: 950.27 miles
Open Loop - Bank 1: No
Closed Loop - Bank 1: Yes
Open Loop due to Driving Conditions - Bank 1: No
Open Loop with DTC - Bank 1: No
Closed Loop with DTC - Bank 1: No
Open Loop - Bank 2: No
Closed Loop - Bank 2: No
Open Loop due to Driving Conditions - Bank 2: No
Open Loop with DTC - Bank 2: No
Closed Loop with DTC - Bank 2: No
Engine load: 30.20 %
Freeze Frame Engine Coolant Temp: 66.00 Deg.C
Intake Air Temperature: 215.00 Deg.C
Ambient Air Temperature: 12.00 Deg.C
Short Term Fuel Trim - Bank 1: 12.49 %
Long Term Fuel Trim - Bank 1: -3.13 %
Short Term Fuel Trim - Bank 2: 9.37 %
Long Term Fuel Trim - Bank 2: -7.04 %
MAP Voltage: 1.96 V
MAP: 46 kPa
Atmospheric pressure: 97 kPa
Engine RPM: 875.00 rpm
Vehicle speed: 0 MPH
Throttle Position Sensor 1 Percent: 12.94 %
Battery voltage: 14.58 V
Fuel level: 95.69 %
Purge Solenoid Current: 0.00 mA
Purge Duty Cycle: 0.00 %
Idle Air Control (IAC) Current: 0.00 mA
Idle Air Control (IAC) Duty Cycle: 0.00 %
EGR Flow: 0.00 g/s
Current Adaptive Cell ID: 24
Spark advance: -2.00 Deg
AC Clutch: Disengaged
EGR Gassed Flowing: No
Power Steering High Pressure: No
AC Switch: Off
PRNDL in Gear: No
Brake switch: Pressed

Here's from my 2022 JT - It was a CCDIFF issue, they forced a cam/crank difference relearn and fixed it for good.

Misfire on entire driver side bank. Dealer changed cam phasers, coils and PCM. 9 weeks later I realized they didn't change the plugs. Doing it myself tomorrow

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