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  #25  
Old 12-27-2012, 10:21 AM
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Re: V6 Cylinder Head Failure

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Originally Posted by jasonl View Post
If you search ( I Own a 2012 JK so I have been reading a lot on the wrangler forums of failures ) there are reported problems on every vehicle Chrysler sells with this engine.
This is totally false...not even close. The last I read, the problem affects ~0.5% of Pentastars on the road. It's statements like this that give us a (false) bad name. There are over 1.5 million Pentastars on the road. The problem has affected around 7500 of them as of August (latest data). Believe what you may, and Chrysler may be "padding" the numbers, but not every Pentastar is affected...not even close to 10%.
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  #26  
Old 12-27-2012, 12:03 PM
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Re: V6 Cylinder Head Failure

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Originally Posted by kkreit01 View Post
This is totally false...not even close. The last I read, the problem affects ~0.5% of Pentastars on the road. It's statements like this that give us a (false) bad name. There are over 1.5 million Pentastars on the road. The problem has affected around 7500 of them as of August (latest data). Believe what you may, and Chrysler may be "padding" the numbers, but not every Pentastar is affected...not even close to 10%.
I may have misunderstood what Jason said.

My take was that the problem was not model specific. I didn't think he was saying it was every V6 engine.
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Old 12-27-2012, 12:12 PM
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Re: V6 Cylinder Head Failure

I agree even if the number has now reached 10,000 that is still only .7% of all Pentastar equipped vehicles. But what if heavier/larger vehicles or vehicles operated in high load conditions (off road, towing) are more likely to experience the failure. That would raise the failure expectancy of V-6 GCs made before June 2013 considerably. 10x ? 100x ? Who knows ? Chrysler does and they aren't talking.

One thing I do consider probable is that the failure rate of Wranglers seems to be even higher than GCs. Major difference: 3.70 rear gear.

Personally have always believed in running engines on th cool side of the specs since I live in a hot climate. Now even more so.
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  #28  
Old 12-27-2012, 03:46 PM
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Re: V6 Cylinder Head Failure

Maybe it seems to affect Wranglers more because the owners yell louder. Probably nearly every Wrangler owner is on a forum. WK2, maybe 5% or less of owners are active on a forum. You probably won't hardly find any failures among Journeys (if searching the interwebs)...
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Old 02-10-2013, 10:44 PM
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Re: V6 Cylinder Head Failure

Add my 2011 GC to the list, with an assembly (build) date in Feb of 2011, if I remember right.

CEL light went on just after xmas. I dropped by the dealer expecting to hear that all the snow trailblazing I did in Canada over the holidays loosened a sensor or something, and jaw dropped when he said the code was a misfire, and would probably mean a new head. To verify, he said they would clear the code, and if/when the CEL went on again, to come back for the 2-day operation. A week later it did, and has been fine since with a new head.

What surprised me the most was how nonchalant he has about it, and that he had one already in stock. Their shop had already done over 15 of them, apparently (northern NJ), and they understood the root cause to be a machining (not design issue) on certain 2011/2012 engines. Something to the effect that the poor tolerances in the head itself allow for valve seating issues, ergo misfires.

It's a warranty issue covered under the 5/100 powertrain warranty of the JGC. My truck had 28K (mostly highway) when it happened.

I love my JGC, but I'm skeptical that it's a long-term keeper. Pentastar issues, transmission performance (low-speed intermittent clunking), head unit gremlins (disappearing HDD content)... all point to a beta release. May trade before the 3/36 runs out, tho it will be a difficult break-up.
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  #30  
Old 02-11-2013, 10:20 AM
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Re: V6 Cylinder Head Failure

i think i may have this. Need to take it to the dealer still. Driving last night and i suddenly felt a vibration like a gear slipped or something and heard a slight thud. Next thing i know CEL comes on, and i feel a loss of power. Luckily power kicked back in before a steep uphill and i made it the rest of the 1.5 miles to home.

I'm at 35,800 miles... good to know if my problem is with a cylinder head i'm still good till 100K. whew....
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  #31  
Old 03-26-2013, 09:57 AM
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Re: V6 Cylinder Head Failure

In the club. 21K miles. Intermittent CEL.

Dealer need 10 hours, back on Thursday.

Claims they are using new, not refirbed replacement.
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Old 03-26-2013, 02:19 PM
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Re: V6 Cylinder Head Failure

Be interesting to see if a return to warm weather increases the incidence. If heat related you would think a reflash to turn the cooling fan on at 200F would be easy.
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  #33  
Old 04-10-2013, 12:18 PM
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Re: V6 Cylinder Head Failure

Quote:
Originally Posted by kkreit01 View Post
This is totally false...not even close. The last I read, the problem affects ~0.5% of Pentastars on the road. It's statements like this that give us a (false) bad name. There are over 1.5 million Pentastars on the road. The problem has affected around 7500 of them as of August (latest data). Believe what you may, and Chrysler may be "padding" the numbers, but not every Pentastar is affected...not even close to 10%.

Didn't mean to offend you, but I was clear in what I said and you took it the wrong way. I am not slamming Jeep, I own two of them. If you do any type of search you will find the Pentastar has head problems in different vehicles, not just the JK, Grand Cherokee etc. Is it .5% or 1.5% ? I dunno, but there are head failures reported in everything from and in between Wranglers and Caravans. They revised something in the head so that should tell you, me and everyone else no matter how loyal you are to Chrysler, that there was some sort of issue. If my JK needs the head replaced and it's under warranty, I am good. I worked as a Ford Tech and saw the same type issues. It is what it is.
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  #34  
Old 04-10-2013, 12:35 PM
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Re: V6 Cylinder Head Failure

^ NP. Sorry I misunderstood. I understand what you mean now -- a problem with ever application of the Pentastar.

We're still under 20k mi on ours. It's still been problem-free (keeping fingers crossed).
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Old 04-12-2013, 08:54 AM
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Re: V6 Cylinder Head Failure

"Statistics don't lie but..." That is .5% of all Pentastars. However the issue seems to mainly affect heavier vehicles - over 4,000 lbs. So lets say that Pentastar equipped only make up (10%- Hemis - SRTs) 6% of all Pentastars. Even 10% of GC's failing would not impact that .5% of all statistic.

So far two things are evident: when misfires are reported (and not something normal like a bad plug) CJF just replaces the head. No problemo.

It appears to be a valve guide issue but load/gas has also been mentioned both of which can lead to detonation if there is a hot spot in the chamber and the hammering can wear a valve guide. Lotsa of other things could contribute (like a lean condition is #2 and/or #4 - most common reports).

All that said CJF has not produces any specific figures by car line which I suspect is deliberate.

Personally, I suspect that simply using a 5% cooler fast-opening thermostat and bringing the cooling fans in sooner to keep coolant in the 190F-200F range fully warmed up could have a significant impact on the issue.

Until then, if in stop-and-go traffic and the temp starts to climb, just turn the a/c on - it will turn the radiator fan on immediately.

Will be interesting to see as warm weater returns if the failures do also. Meanwhile I just check for misfires about once a month.
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  #36  
Old 04-12-2013, 01:23 PM
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Re: V6 Cylinder Head Failure

Interesting thread. I have a GC with 8900+ miles on it. I have had two oil changes at the dealers, and both times they put the wrong oil in. In lieu of 5W-20 they have put in 5W-30, and it is some really cheap bulk crap from Chrysler. The first time I took it back and made them change it to the correct weight, with Mobil 1. This time, we have been snowed in, so I changed it, the day after, in my garage. I had 8 quarts of Mobil 1 in my cabinet. I am wondering if using the incorrect weight of oil in this engine would contribute to these failures, especially in extreme cold weather conditions. I do not put E-85 in it and only use premium gas, since is Ethanol free and 100% gasoline. Just curious if we are looking at this problem in the future, and glad all this information was here.
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