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Old 10-08-2012, 06:07 PM   #2731
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So what have you guys been telling the dealer when you go in? I'm having the ticking (I think) and no lights are showing up. I have to go anyways for a seatbelt that won't retract. Also I got my 2012 used what do I need to show the dealer to show I have warrenty

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Old 10-08-2012, 06:13 PM   #2732
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Quote:
Originally Posted by johnnyjellybean
Regardless of top tier or not.......... higher octane wil stop pinging

I've been putting in 91 since the past week and all is good again.
If owners manual had said to only use higher octane fuel I would not have purchased. Manual does say to use 87 octane and I purchased jeep. However, I've read where gm said the chevy cruze could be towed four down...many people bought them, had tow bars installed, had transmissions tear up, and gm said "recall, no longer towable four down and gm is not responsible for broke transmissions". Sure am glad I went with jeep for my tow car.

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Old 10-08-2012, 06:47 PM   #2733
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How do you know which head you have?
If your Jeep was built prior to June 2012 it had the AA head. If built in the June to about Aug 2012 it had the AB. Sep 2012 to current are the AC heads. I may not have the dates exact but it's pretty darn close. They are only installing AC heads now and you will see the AC suffix on your repair receipt.
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Old 10-08-2012, 06:50 PM   #2734
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Originally Posted by Mowgli25 View Post
So what have you guys been telling the dealer when you go in? I'm having the ticking (I think) and no lights are showing up. I have to go anyways for a seatbelt that won't retract. Also I got my 2012 used what do I need to show the dealer to show I have warrenty
The dealer should be able to pull your warranty by VIN number. You probably won't get a sympathetic ear without a code.
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Old 10-08-2012, 07:31 PM   #2735
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I have a build date of 07-10-12 and it still has a AA head.
Engine was a US build.
No issues so far but not many miles either.
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Old 10-08-2012, 07:45 PM   #2736
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I took mine in this morning for this issue and was very pleased to find out Chrysler is fixing the issue immidiately and threw in a rental on Chryslers penny until fixed!
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Old 10-08-2012, 08:02 PM   #2737
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Originally Posted by capndan
I have a build date of 07-10-12 and it still has a AA head.
Engine was a US build.
No issues so far but not many miles either.
How can you tell that you have the AA head? I don't think anyone has been able to find the AA/AB/AC part numbers anywhere on the head. The only number I've seen is the casting number on the back of it (05184445A1) which seems the same on all of them.
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Old 10-08-2012, 08:30 PM   #2738
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My manuf. date is 8/11 on mine and took it in for the ticking/knocking noise which were my words exactly this morning to tech. They ran VIN and apparently a bulliten popped up to replace immediately. They are overnighting the head. they wouldnt let me drive it after today. Mine did not have a check engine light at all. Im at 18,000 miles. Apparenlty this motor should be as quite as a mouse so if you are hearing any "lifter type" noise even after it idles down and it was built before October 2011 I would def. take it in!
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Old 10-08-2012, 08:50 PM   #2739
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My mistake. After reading through the post I thought A1 was the original design. Looks like I might be a test vehicle for the AB head if the above dates are accurate.
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Old 10-08-2012, 10:35 PM   #2740
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3.6l bad cylinder #2/intake valve

I own a 2012 jkur. Slight ticking noticed on drivers side. Then at 10400 miles check engine light came on. I had to drive for another +-125 miles then the check engine light went off. Cool right? Then check engine light came back on and a significant loss of power. Called my dealer, brought in on a Friday and by next Monday, Had a new head and valve on cylinder number two. Cylinder two at 90 psi and replaced intake valve.

300 miles on it and now better mpg & power than the first day I bought it.

Dealer didn't hesitate to repair. I am truly amazed (for once by a dealer)

I hope ALL dealers take care of your Jeep(s)

Sorry I do not know what head AA, AB my jeep has...
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Old 10-08-2012, 11:23 PM   #2741
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looks like people are getting good treatment now. Yetti2012 is the first person that's reported a VIN-related head replacement. interesting.

most parts on the jeep will end in AA because they're first iteration. what i'm interested in is what the passenger side head says on the '13 because i think you can see the part number on it.
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Old 10-09-2012, 06:23 AM   #2742
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For everyone's sake I hope the AC head is the answer. They have not been in use long enough yet to prove themselves.

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Old 10-09-2012, 07:00 AM   #2743
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Ours had had same problem,but from earlier posts the dealer had or rubi for total of 52 days and said there is nothing eles that can be done, its normal noise! You will have to file lemon law..... So 35 days ago i mailed lemon law to chryler,yet to hear from them... Its pretty bad a mfg cant stand behind their product. I should have stay with my toyota's
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Old 10-09-2012, 09:46 AM   #2744
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Does gas mileage tend to drop as the ticking gets louder? I'm down to under 16mpg and even when driving around town I'm normally at 17.
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Old 10-09-2012, 10:07 AM   #2745
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Originally Posted by Six View Post
Does gas mileage tend to drop as the ticking gets louder? I'm down to under 16mpg and even when driving around town I'm normally at 17.
Could be winter blend gas as well.....
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Old 10-09-2012, 11:51 AM   #2746
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Originally Posted by capndan View Post
I have a build date of 07-10-12 and it still has a AA head.
Engine was a US build.
No issues so far but not many miles either.
That is the latest build I've heard of with the older heads. Condolences and high hopes that you got one of the good ones...

BTW, how do you know you have the AA head? Was it on the build sheet because I didn't think anyone was able to see a part number to determine?

Never mind..saw your 2nd post afterwards.
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Old 10-09-2012, 03:17 PM   #2747
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Quote:
Originally Posted by Tomster View Post
Since I sold my Jeep I am not the one who should do this because some people resent the fact that I am still interested in this head problem; but if someone would simply start a poll with the restriction that a person must have accumulated at least 12,000 miles on his or her 2012 JK in order to vote and that only CONFIRMED head problems are counted, not just "ticking" or CELs, then we might get somewhat of an idea as to how prevalent the problem is.

I started a poll several weeks ago and many of the people who voted that they did not have the problem found out later that they do have it. I set the mileage limit too low. It can take up to 10K to 12K for the problem to show up and sometimes even longer.

Here's the way I would set it up if I were going to start the poll myself. I would also encourage people who had voted in earlier polls to please vote again in this one.

I have at least 12,000 miles on my 2012 JK and I

1. have NOT had a confrimed head problem so far
2. have had a confirmed head problem

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Old 10-09-2012, 10:07 PM   #2748
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Originally Posted by Six
Does gas mileage tend to drop as the ticking gets louder? I'm down to under 16mpg and even when driving around town I'm normally at 17.
I'm wondering the same. I'm getting 15/16 city and 18+ highway.
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Old 10-09-2012, 10:22 PM   #2749
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my mileage was completely unaffected by the ticking. My pre- and post-head average combined is about 20.5.

by the way, i have almost 2,000 miles on my new AC head and it's running beautifully.
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Old 10-10-2012, 06:16 AM   #2750
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This will most likely be handled as a Technical service Bulletin (TSB), which will:
1. Identify the nature and scope of the problem.
2. Defines the corrective action.
3. Issue a TSB to the Dealer network, defining the problem & corrective action, including extended warranty, if necessary.
4. Provide repair parts to the Dealer network, to effect the repair.

The retiree network, which is as good a rumor mill as any, says that a TSB is in the works. No dates for release to the Dealer network being discussed.

You'll have to take my word on this, but in my 31 years with Chrysler I saw many larger problems than this one. This will be solved, the company will continue to build the Jeeps and Cars we all know and love, my retirement will be safe!
Hi Stan - I'm giving your post from over a month ago a bump to see if you have heard anything new via the retiree network rumor mill !
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Old 10-10-2012, 06:21 AM   #2751
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Originally Posted by sonofboxster

Hi Stan - I'm giving your post from over a month ago a bump to see if you have heard anything new via the retiree network rumor mill !
No new rumors. I was going to stop at my dealer to see if the TSB was out, since there was s post about someone getting a new head based on his vin.
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Old 10-10-2012, 07:07 AM   #2752
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So I just got my 13 owner's manual and they address fuel saying that "the use of 87 octane is recommended" and that "the use of premium fuel is not recommended as it will not provide any benefit over regular gas in these engines" WELL .. I have news for them !! They then go on to say and I quote..."Light spark knock at low engine speeds is not harmful to your engine' .
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Old 10-10-2012, 08:54 AM   #2753
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The casting number on the back of the head is visible if you lie under the Jeep with your head near the exhaust loop and look up but apparently that number doesn't really correlate to a part number (it ends in A1 and is the same on 2012 and 2013 models). If you look through the drivers side wheel well with your head at about the 2:00 position on the tire, you can see a laser etched set of four rows of codes on the side of the block. The first row supposedly represents the Julian date and shift the engine was actually built. The first three digits are the day of the year. Based upon the numbers on mine, there's about a four week lag between engine assembly date and vehicle assembly date.
I have a 2012 JKR. I used the method you described here to find my engine build date. Julian date was 193 = July 10th, 2012. Build date on the door sticker for the Jeep itself is July 19th, 2012. This is a relatively close time period between the two dates compaired to others I've seen posted here. I'm hoping this is because they stopped building with the AA head, and decided to use the most recent builds that include the AB heads in July. I only have 380 miles on mine. The drivers side head is very quiet. In fact, the passenger side makes slightly more noise. Still, it's not a great feeling wondering if your brand new engine will need a head replacement. Much of the uneasiness could be relieved if Chrysler would just step up and announce by VIN # what heads we have. Great site BTW. Lots of useful information.
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Old 10-10-2012, 09:03 AM   #2754
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Hi Stan - I'm giving your post from over a month ago a bump to see if you have heard anything new via the retiree network rumor mill !
I called my dealer today regarding this issue.
The service adviser referred me to:

Tech Tip: TT 900-2479.

I will paraphrase the discussion:
If fault code T0302 is present, do a compression check.

If low compression is found call the Tech Hot Line for further instructions, provide the following information, from the customer, to the hot line:
driving cycle (city, highway, etc)
type of fuel used
mileage
and some more.

I didn't ask what happens if low compression is not found, likely the fault code will be cancelled and the Jeep returned to the owner.

The Tech Hot line can authorize a head replacement. The heads will be returned to Chrysler for further analysis.

A Tech Tip is a notice sent to dealers to help them diagnose & repair problems. These are often stand alone documents, with no further follow up. They are some times used, as it sounds in this case, to collect field data for possible future Service Bulletins. depending on the results of the data collection & analysis, a follow up bulletin may, or may not be issued.
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Old 10-10-2012, 09:14 AM   #2755
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Regarding the spark knock questions, I have spread my bread upon the water, we will have to wait and see what returns.
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Old 10-10-2012, 09:17 AM   #2756
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Quote:
Originally Posted by stans1stjeep View Post
I called my dealer today regarding this issue.
The service adviser referred me to:

Tech Tip: TT 900-2479.

I will paraphrase the discussion:
If fault code T0302 is present, do a compression check.

If low compression is found call the Tech Hot Line for further instructions, provide the following information, from the customer, to the hot line:
driving cycle (city, highway, etc)
type of fuel used
mileage
and some more.

I didn't ask what happens if low compression is not found, likely the fault code will be cancelled and the Jeep returned to the owner.

The Tech Hot line can authorize a head replacement. The heads will be returned to Chrysler for further analysis.

A Tech Tip is a notice sent to dealers to help them diagnose & repair problems. These are often stand alone documents, with no further follow up. They are some times used, as it sounds in this case, to collect field data for possible future Service Bulletins. depending on the results of the data collection & analysis, a follow up bulletin may, or may not be issued.
PS: my Tech Advisor found the TT by inputting my VIN into the system, and this TT came back as applying to my Jeep. I currently have 8800 miles on it with no issues.
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Old 10-10-2012, 12:41 PM   #2757
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You get a gold star for today! LOL
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Old 10-10-2012, 02:34 PM   #2758
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Ours had had same problem,but from earlier posts the dealer had or rubi for total of 52 days and said there is nothing eles that can be done, its normal noise! You will have to file lemon law..... So 35 days ago i mailed lemon law to chryler,yet to hear from them... Its pretty bad a mfg cant stand behind their product. I should have stay with my toyota's
Some Dealershipss are useless, it seems, whereas other Dealerships will get things done. Case in point was a engine rear seal leak on my 2003 TJ years back. The Chrysler Dealership, that sold me the vehicle, said they checked twice and couldn't find the leak. I told them it was there as there was lots of evidence on my driveway to prove it. After telling them I was getting better service from another Chrysler Dealership with respect to a 2002 Grand Caravan I owned, the Service Manager said "maybe you should take the Jeep there then". I did just that and leak was fixed under warranty without any questions asked. It was like comparing night and day.

As to Toyotas, there's lots of horror stories about them on the web. Do a Google search using "toyota cylinder head problem" and you won't draw a blank by any means.

At present, Toyota has a massive recall on for power window glitches (7 million plus vehicles for 2007 to 2009, both cars and trucks). Then there's Honda which had windows that suddenly disappeared as they fell in their tracks to the shock/distraction of the Drivers.

Toyotas and Hondas are good vehicles, most vehicles are these days. They are just overated.

Considering Chrysler engines over the years, I had two made in Japan Mitsubishi 2.6Ls that blew head gaskets, and a mixture of 8 - V8s, 6s and 4s, made by Chrysler, that required no engine work except for the seal leak mentioned above. The ninth one, a 2.5L required major work due to an engine knock (under warranty).

My experience with Chrysler made engines is quite positive, same for their transmissions. I tend to keep a vehicle for many years and run up the miles.

As for the Pentastar, that engine went through a lot of testing, including some by Roush Industries. Maybe that's where they went wrong. Roush = Ford.

Some info on the engine and the testing: Pentastar Engines: Overview and Technical Details
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Old 10-10-2012, 02:41 PM   #2759
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Originally Posted by Six
Does gas mileage tend to drop as the ticking gets louder? I'm down to under 16mpg and even when driving around town I'm normally at 17.


Quote:
Originally Posted by sobeperry View Post
I'm wondering the same. I'm getting 15/16 city and 18+ highway.
------

I am getting about the same mpg and am approaching 2,000 miles (purchased 5/1/2012)on my 2012 JKU Sahara Soft top with 3.73 gearing. Maybe the gearing or wind drag on the soft top affects the mpg?

I am fortunate enough to not have to use it as a daily driver. I sometimes wonder if the warranty time will be up before the head shows signs of being a problem.

I sincerely hope Fiat Chrysler will back it regardless of warranty expiration.

It is good to hear that the ones that have been replaced are working well.
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Old 10-10-2012, 05:24 PM   #2760
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actually i had mine replaced this week. took 1 day . i was nervous about potential leaks of coolant or oil but so far so good.

looking at the engine you would never know it was ripped apart.

my dealer said they have done so many that they can breeze right through the job now since they have a dedicated person .

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