Gren71
Well-Known Member
My JT has done this a handful of time so far...I cant catch the code and im all of 500 miles from the warranty expiring. So I doubt it will be a covered problem with a TSB anyway.
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Which obd device are you using? I tried look it up from your first post and couldn’t find one.Almost have to keep the software running on the phone or tablet while running it to catch it. Luckily, this one did it enough in the driveway AlfaOBD captured several frames. The guys at the dealership asked "what the heck did you use to capture those frames? Those reports you left us have things that normally only FCA tools can capture"
They were impressed with the multiple frame snapshots, each showing a misfire incident and what was going on with the engine at that time.
I ended up getting a different obd2 reader. And downloaded (and paid for) the jscan app before seeing this.This is the hardware:
https://www.amazon.com/gp/product/B07JFRFJG6/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
This is the software:
https://www.amazon.com/gp/product/B00S715LCQ/ref=ppx_yo_dt_b_d_asin_title_o00?ie=UTF8&psc=1
I also used software called "Torque" - it gave me this shorter report -
Fault log report generated by Torque for Android
=================================================
Vehicle VIN: 1C4RJFBG...................
Vehicle Manufacturer: Chrysler
Vehicle Calibration ID: 68504960AD
D
Current Fault Log
------------------
ECU reports no current faults
Pending Fault Log
------------------
P0303: Cylinder 3 Misfire Detected
Historic Fault Log
------------------
ECU reports no historic faults
Other discovered fault codes
(possibly pending, current or manufacturer specific)
----------------------------------------------------
End of report.
i always drive conservatively so im not sure thats the issue. But is it really normal to have misfires like this? I notice them while driving and have them show on the app. Seems like its not normal to me but im far from an expert with enginesDepending on the time frame that is not an alarming number of misfires. I have had my jeep on the dyno to adjust the timing map. Not sure if the timing maps are all the same or close, but there where some very ruff spots, in the lean cruise, light load areas. If you drive lightly the throttle will adapt to a light agression factor and the acceleration enrichment is not enough in cold weather to account for tip in. If you do an adaptive learn reset on the engine and transmission. It will go away for a while. If you do the reset and drive like a teenager it will go away for a long while. My guess is you where judicious with the throttle taking it to the dealer so it clipped up the agression factor and you had the needed fuel on tip in. I am not sure how FCA did the mapping on this latest go of the 3.6, but all the info I have seen so far would indicate they messsd up a bit
The counts are normal, if you are feeling them that is not acceptable. Is it broke not nessicarily. I have seen some information that unfortunately it is tuned to potentially run like this. The good news is at low powerit will not do any damage for a long while, and you can stop it if only temporary. The TSB software I have seen just dumbs down the diagnostics, which is not an acceptable fix.i always drive conservatively so im not sure thats the issue. But is it really normal to have misfires like this? I notice them while driving and have them show on the app. Seems like its not normal to me but im far from an expert with engines
well that atleast makes me feel a little better. Im still going to have my dealer do a quick scan just to see if there are codes I am not seeing. Just seems odd that in addition to feeling the jutter ive lost 2mpg recently for no real reasonThe counts are normal, if you are feeling them that is not acceptable. Is it broke not nessicarily. I have seen some information that unfortunately it is tuned to potentially run like this. The good news is at low powerit will not do any damage for a long while, and you can stop it if only temporary. The TSB software I have seen just dumbs down the diagnostics, which is not an acceptable fix.
To add to this most engines have some misfrire that happens as transients happen with throttle and shifting. As long as the counts don't accumulate under power, it usually is insignificant. They should also be mostly imperceivable. As it is a quick second on tip in or abrupt downshift. You actually hear this on modern muscle cars and people compliment the raspy exhaust
I feel like i can feel a hiccup or momentary loss of power, especially now that im paying more attention...but i just dont know if im making a mountain out of a mole hill. Or even just imagining it happening..I find that odd because mine logs no misfires - neither does my wife's 2021 now after the TSB.
Both smooth and the software doesn't show any misfires while it's running, and it stores no misfire codes.
The misfires with my wife's '21 GC were rough. It bucked, it was so obvious anyone would have asked "what's wrong with this thing.
Now when I plug in - it's clean. You note a hiccup during a moderate throttle upshift like 4 to 5 but otherwise, no misfires show.
Mine never had shown any. Not while I've been connected to it.
I grew up doing a lot of "tuning by ear" and can normally detect a misfire on almost anything.
Pre-OBD it's not uncommon and you can see it happen live on the scope (fuel OR ignition related, either way) and my 94 4.0 in my Eagle will now and then misfire at idle (it's got a cam that's a bit steep in the ramp), but the exhaust is normally smooth as silk.
The TSB resets the adaptive learn and then slows down the adaptive learn. This keeps it from messing with the engine rating. Then they make the misfire monitor more tolerant. This will quell misfiring, not sure if it does it long term. The engine is set up to run LEAN.I find that odd because mine logs no misfires - neither does my wife's 2021 now after the TSB.
Both smooth and the software doesn't show any misfires while it's running, and it stores no misfire codes.
The misfires with my wife's '21 GC were rough. It bucked, it was so obvious anyone would have asked "what's wrong with this thing.
Now when I plug in - it's clean. You note a hiccup during a moderate throttle upshift like 4 to 5 but otherwise, no misfires show.
Mine never had shown any. Not while I've been connected to it.
I grew up doing a lot of "tuning by ear" and can normally detect a misfire on almost anything.
Pre-OBD it's not uncommon and you can see it happen live on the scope (fuel OR ignition related, either way) and my 94 4.0 in my Eagle will now and then misfire at idle (it's got a cam that's a bit steep in the ramp), but the exhaust is normally smooth as silk.
I would let the dealer see what you found, and check it out.I feel like i can feel a hiccup or momentary loss of power, especially now that im paying more attention...but i just dont know if im making a mountain out of a mole hill. Or even just imagining it happening..
I will be swinging by my dealer in a couple hours. Hopefully its nothing or they find something since my warranty expires in 100 miles