'12 Pentastar #2 misfires - Jeep Garage - Jeep Forum

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  #1  
Old 05-08-2015, 10:36 AM
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'12 Pentastar #2 misfires

Periodically I check for the dread misfire and for 3 years and 22k miles and always both long term and last have been zero to one. Recently this has changed.

16 Feb 15
MID:$a3 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 2 Test result value: 1Count
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2 Test result value: 0Count

19 April 15
MID:$a3 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 2 Test result value: 6Count
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2
Test result value: 3Count

26 April 15
MID:$a3 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 2
Test result value: 38Count
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2 Test result value: 4Count

5 May 15
MID:$a3 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 2 Test result value: 162Count
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2
Test result value: 20Count

Since I am planning some trips with my trailer this summer, I am concerned but the dealer says util the CEL comes on they cannot do anything. Know it is under warrenty but would hate to be stranded on an Interstate miles from home.

My question is "How long usually elapses between the onset of misfires and the lighting of the CEL" This seems to be coming on pretty fast.

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  #2  
Old 05-12-2015, 10:50 PM
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Re: '12 Pentastar #2 misfires

99 reads and no comment. No-one knows ?

Oh well need to run down to south Florida this week. Will see what is happening then.
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Old 05-13-2015, 01:16 AM
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Re: '12 Pentastar #2 misfires

Quote:
Originally Posted by padgett View Post
99 reads and no comment. No-one knows ?

Oh well need to run down to south Florida this week. Will see what is happening then.
Sorry, I can't answer your question, but in my wrangler it happened exactly at 23,000 miles. I read that it happens closer to 23k than 22k. So you have that going in your favor.

If I were in your shoes, I would try any of these things:

1) Try another local dealer (I'm guessing this isn't an option or you would've tried it already)
2) Talk to somebody more senior at the dealership. Warranty repairs are a profit center for the dealership, so they might go to bat with Jeep for you.
3) Call Jeep. Tell them about your codes and that you have a long trip soon. Tell them how you don't want to get stuck on the road (my repair took 3 days since they had to wait for parts.) Ask them that if it fails on the road, would they give you a loaner for the rest of your vacation and you can pick up your Jeep on the way back.
4) Go to a dealer at your destination. Hopefully you'll get a better dealer.

Always be polite. You catch more flies with honey.

Good luck!
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Old 05-13-2015, 09:28 AM
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Re: '12 Pentastar #2 misfires

Verdugan's responses are spot on, this will only be resolved by a dealer or by contacting Chrysler directly and then back to the dealer. The only thing I'll add is that you're problem is a known condition with a recall associated that has become commonplace so in reality, and in south Florida, they are a lot more forward about handling it before the major problems start, oddly they are proactive lately. I would personally do exactly what Verdugan recommended in going to another dealer, I'm usually fine with asking for a manager first but I've lost confidence in the hierarchy. At the new dealer I may be a little "clearer" on the symptoms I was experiencing and the worries about ending up in the same situation as so many other people or having to deal with it somewhere your not familiar with.
Not saying you weren't nice, just reminding in case the situation heats ya up, it gets the best of me, be honest and respectful as they are used to almost everything except good attitudes, so throwing the curveball of being nice does help.

Flys like bullcrap even more than honey..

Really sorry, I grew up with the get more flys with honey comment and it's always true but someone threw me that loop long ago.
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Old 05-13-2015, 01:44 PM
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Re: '12 Pentastar #2 misfires

Thank you, good ideas. Going to South Florida and back this weekend (about 400 miles RT) and will see what the counts are like when I get back. Apparently not enough to set a code yet. Who knows maybe the CEL will be on by then.

From what I saw back when it was common was that
1) it can't do more damage to drive than has already been done.
2) won't leave you on the side of the road
3) code to watch for is P0300 or P0302.
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Old 05-14-2015, 07:12 PM
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Re: '12 Pentastar #2 misfires

And got back with just over 23k mles and:
MID:$a3 TID:$0b
Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 2 Data
Test result value: 135 Count
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2 Data
Test result value: 565 Count

(other cyl are 0 or 1)

And the CEL appeared with a P0302 during the return trip. Called the dealer and they were somewhat clueless but was late in the day.

Suppose I need to take it in and just let them play but suspect a new head is in my future.

Wonder if they have an alternator...
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Old 05-15-2015, 04:52 AM
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If it's the cylinder head it'll sound like a sewing machine. If you pop the hood with the engine running there will be a difference between the sound from the left and right cylinders. Best thing is to ask the dealer to perform a leak-down pressure test.
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Old 05-18-2015, 10:00 PM
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Re: '12 Pentastar #2 misfires

Have been running errands locally and the CEL light has gone out but still showing 100+ misfires currently. P0302 is stored though.

May wait until time for regular oil change in June or July to take in, suspect it is just beginning.
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Old 06-02-2015, 10:37 PM
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Re: '12 Pentastar #2 misfires

CEL (P0302) is back and over 600 misfires on #2. Does anyone know if you can feel a 25% leakdown ? It seems to be running fine & cannot hear anything but mpg is down a bit.

Did find the TSB: http://www.wk2jeeps.com/tsb/tsb_wk2_0900214b.pdf

My concern is not to be on a trip this summer and have a massive failure.
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Old 06-03-2015, 12:03 AM
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Re: '12 Pentastar #2 misfires

At this point you seem to be just playing a game, you can read codes but not signs? The head replacement "recall" sites your issues as symptoms and you still haven't driven it to a dealer? Isn't this still under warranty for you? Convenient or not if you get stranded it will only be your own fault and who knows where, as you've been tracking a major malfunction related to a known problem.. What is stopping you from getting this fixed? I hope it's nothing bad, I mean no offense I just can't see your point anymore.
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Old 06-03-2015, 09:58 AM
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Re: '12 Pentastar #2 misfires

That is true, you do not understand my situation. If that was all you had to say, why did you bother to post ?

I just do not want to take to dealer and have him decine to perform the replacement because it does not fail the leakdown test.

That said I plan to take it in tomorrow since they now also have the parts forthe alternator recall, but just wanted to know if I should be feeling/hearing a cylinder that has gotten bad enough to qualify for the TSB yet or if it can still be smooth/silent as mine.
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Old 06-04-2015, 12:30 AM
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My experience was that you could hardly feel a difference in performance with only 5 cylinders. Like you said miles-per-gallon takes a slight hit. Every once in a blue moon you will feel a hesitation, most noticable if you should need to step on the gas. I took mine in after the code showed up twice. First time I waited to see if it would clear by itself, which it did after a few cycles, second time it came back on I took her in.
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