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Old 08-24-2012, 07:37 AM   #2221
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I've been getting around 18-19 mpg with mixed driving at around 500 miles. I thought that was low until I read some of these posts.

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Old 08-24-2012, 07:53 AM   #2222
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Originally Posted by JPi1 View Post
So the rumor I heard a few months ago was correct, valve seats. And if they elongate, they will eventually remove themselves from their press fit in the head and not let the valve close completely, resulting in the piston jamming the valve into the seat, damaging the piston, valve and head. I would suggest if your engine light comes on, and it starts running rough, take it in to the dealer ASAP. Replacing a complete head is one thing, tearing down the lower end to replace a piston, and possibly having cylinder wall damage, is another.
This can't be true because silversport said this would not happen and that anyone who says otherwise would be given his eye roll or facepalm smiley for suggesting it. Just like claiming that every vehicle manufactured with this flawed head design would eventually succumb to this problem was given his face palm smiley as well. I would say case closed and time to stop listening to silversport's Baghdad bob style shilling for Chrysler corporate.

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Old 08-24-2012, 08:44 AM   #2223
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Originally Posted by Braveheart12JK View Post
Picked her up an hour ago. No more ticking at idle!!! I'm going to keep an eye on the MPG's and see if they go up, stay the same or go down. lol
I was impressed. I popped the good open before I even walked in to the service dept. It looked good under the hood. I then checked the Jeep out for casualties: destroyed driver's side flare, paint damage near grille/hood and a few other areas. She came back just the way she left
I'm now going to attach two photos of the write up of what was going on and what they did
That looks like mine, with the difference that mine had 170 psi overall and only cylinder #2 was affected (110 psi)! I also got one head with "AB" in the end of the spare part no.
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Old 08-24-2012, 09:13 AM   #2224
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Originally Posted by TK-213 View Post
JKdozer- I'm in the same boat. some tick, but not crazy - but crapppppppy mileage - band before people tell me I'm workin the skinny pedal too hard, I assure you I drive like a granny - I assumed it was just b/c the AC was running a bunch - because I went from about 18 down to 15.7.... boo.
I am down to 15.2 mpg but mostly short trips with AC on and only aroud 1,200 miles on it. No tick. I have read it gets better MPG above 5,000 miles on the engine. It has 3.73 gearing with automatic.
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Old 08-24-2012, 09:18 AM   #2225
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Originally Posted by Jeeperz Creeperz View Post
I am down to 15.2 mpg but mostly short trips with AC on and only aroud 1,200 miles on it. No tick. I have read it gets better MPG above 5,000 miles on the engine. It has 3.73 gearing with automatic.
I have a tick right after startup for a few seconds after it sits a few days. After that its REAL quiet. I'm at 4600 miles and seem to be seeing an increase in mpg.
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Old 08-24-2012, 09:21 AM   #2226
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I would have never guessed the intake valve. I thought the exhaust valve would be more vulnerable since it gets so hot. Thanks for posting the technicians work description. I think the seat damage could be caused by a valve guide that got loose or couldn't keep the valve centered in the seat. Just my observation and I'm hoping to get some more info on "what's different" someday.
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Old 08-24-2012, 09:24 AM   #2227
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Blackrub - Mine's the same way, loud tick at startup then I don't hear anything - unless I'm passing a median wall with windows down - I can kind of hear something, but it's not worse than that. No CEL - but milage on the computer went from 18-ish down to 15-ish... I'm hoping it's just AC running all the time. Are other people seeing milage go back up with new head- or are the two unrelated? I know they're not hybrids, but I was surprised by the change considering I don't drive any differently at all.
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Old 08-24-2012, 09:39 AM   #2228
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In getting first oil change. Asked about head problems. They say they have never heard of it lol. Dewildt Jeep Hamilton Ontario. Hope this is not the start of a good relation.
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Old 08-24-2012, 09:49 AM   #2229
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Originally Posted by Tomster
I'm happy for you, Braveheart. Like you said, I hope it turns out well for all concerned. That doggone 2012 JK is one sweet Jeep and once that head problem is taken care of and there is no longer a dark cloud hanging over the owner's head, he or she is going to enjoy driving the best Jeep ever built.

Keep us posting as you accumulate some miles.

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I will def keep periodically posting in this thread with some updates as to how it goes from here

Bluehen, I hope yours also went smoothly and I hope it stays trouble free from here on out for u!
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Old 08-24-2012, 10:17 AM   #2230
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Quote:
Originally Posted by Dale_K
I would have never guessed the intake valve. I thought the exhaust valve would be more vulnerable since it gets so hot. Thanks for posting the technicians work description. I think the seat damage could be caused by a valve guide that got loose or couldn't keep the valve centered in the seat. Just my observation and I'm hoping to get some more info on "what's different" someday.
I think it is very clear that the guide is a bit oversized and keeps the valve from seating squarely, repeat over and over causing the out of shape seat.

I agree with you.
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Old 08-24-2012, 12:14 PM   #2231
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I think it is very clear that the guide is a bit oversized and keeps the valve from seating squarely, repeat over and over causing the out of shape seat.

I agree with you.
Can anyone who is getting their head replaced take a picture of the old head at the #2 or #6 valve position? I just want to see what kind of damage is occurring to the head and valve. Or can someone request to keep the damaged head? A proper tear down of the old head can yield all the answers.
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Old 08-24-2012, 12:19 PM   #2232
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Originally Posted by aypanthony

Can anyone who is getting their head replaced take a picture of the old head at the #2 or #6 valve position? I just want to see what kind of damage is occurring to the head and valve. Or can someone request to keep the damaged head? A proper tear down of the old head can yield all the answers.
To my knowledge the dealers have been advised to send the defective heads back to Chrysler in order to complete the warranty repair. Just what I've been told but I'd imagine someone can get a pic
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-Faulty driver side head replaced at 23,000 miles
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Old 08-24-2012, 12:50 PM   #2233
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Just went for first oil change and talked again to service manger. Was there about a month ago and he said they have only had on head replacement on a Grand Cherokee. They are high volume seller so IMO this is good news. They did oil change as per 2012 guide 5w 30.
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Old 08-24-2012, 12:50 PM   #2234
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I'm going to demand pictures of the head and cylinders as part of the repair. It's my engine and I want to be sure there's no potential issue. I'm still waiting for a CEL and for the "AB" head to prove itself some more.

I'm really shocked at some MPG numbers in this thread. My combined avg. is around 20. I have logged each fillup since day 1 in my JKU. The computer and actual are pretty close. I'll continue logging through the entire head failure and replacement process to see if there's any indication of failure. So far, there's no change in my MPG as a result of the ticking.
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Old 08-24-2012, 12:52 PM   #2235
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Originally Posted by Blastek
I'm going to demand pictures of the head and cylinders as part of the repair. It's my engine and I want to be sure there's no potential issue. I'm still waiting for a CEL and for the "AB" head to prove itself some more.

I'm really shocked at some MPG numbers in this thread. My combined avg. is around 20. I have logged each fillup since day 1 in my JKU. The computer and actual are pretty close. I'll continue logging through the entire head failure and replacement process to see if there's any indication of failure. So far, there's no change in my MPG as a result of the ticking.
Mileage depends on your gearing too. I'm running 4.10 at the moment and get 18 on average at the high and it's always been like that
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Old 08-24-2012, 01:03 PM   #2236
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Mileage depends on your gearing too. I'm running 4.10 at the moment and get 18 on average at the high and it's always been like that
Sure, and a lot of other factors. but some people are saying ~15 driving conservatively. In my last few tanks i had 4 passengers, A/C on max, about 500 pounds of gear, was climbing above 6000 feet, driving at 90mph in the desert, getting stuck in rolling traffic for hours, but still i didn't drop below 18. I was shocked. maybe the automatic is less efficient than it states.
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Old 08-24-2012, 02:35 PM   #2237
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Sure, and a lot of other factors. but some people are saying ~15 driving conservatively. In my last few tanks i had 4 passengers, A/C on max, about 500 pounds of gear, was climbing above 6000 feet, driving at 90mph in the desert, getting stuck in rolling traffic for hours, but still i didn't drop below 18. I was shocked. maybe the automatic is less efficient than it states.
I have your model but with soft top & automatic, even the same color. Could the drag on the softop as well as the auto make the difference? I started out geting 17 on the average but it has been steadily falling.
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Old 08-24-2012, 02:43 PM   #2238
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I have your model but with soft top & automatic, even the same color. Could the drag on the softop as well as the auto make the difference? I started out geting 17 on the average but it has been steadily falling.
I have dual tops. I started out with hard top and switched to the softop in june. No noticeable difference in mileage. Are you 3.73s? I think the auto is a big factor. I'm also running stock wheels and tires.
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Old 08-24-2012, 04:47 PM   #2239
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I just brought her in for an oil change at a different dealership. they initially denied any knowledge of head issues and said it was injectors. they later backpedaled and said they've already replaced several heads. someone needs to tell the dealers it's not a secret anymore
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Old 08-24-2012, 05:27 PM   #2240
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Just picked up my 12 Rubicon. I will have to keep an ear out for this.
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Old 08-24-2012, 07:38 PM   #2241
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I have the auto with hard top, and I have been getting around 20 mpg. This is through the computer, so I finally re-set the trip, and filled it up. Havent filled it yet, but I will see how far it is off from the computer. And I am still under 3,000 miles.
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Old 08-24-2012, 07:42 PM   #2242
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2012 JKUR. No ticking. 2.5" AEV lift, ARB bumpers and tire carrier, Winch, and 285/75 KM2s. 15.7 MPG average. Only have 600 miles on her though.
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Old 08-24-2012, 07:56 PM   #2243
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By the way, can anyone decipher this:


Its a July 2012 built JKUR.
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Old 08-24-2012, 08:35 PM   #2244
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Originally Posted by simadownow6988
By the way, can anyone decipher this:

Its a July 2012 built JKUR.
Upside down in pic. I see 2012 07 18
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Old 08-24-2012, 08:37 PM   #2245
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2012 01 18
Turn it upside down.......
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Old 08-24-2012, 08:38 PM   #2246
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Originally Posted by bengen1

Upside down in pic. I see 2012 07 18
Couldn't tell if it was a 2 or 7...
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Old 08-24-2012, 08:39 PM   #2247
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I know its upside down, but I cant figure out what the month is. It cant be a 7. The Jeep was built the last day of June, but is labeled as a July 12 build.
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Old 08-24-2012, 08:40 PM   #2248
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I would go with a 2, makes sense, the engines usually have a 4 month lead time over the jeeps themselves.
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Old 08-24-2012, 08:41 PM   #2249
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Originally Posted by DJ_B1R

Couldn't tell if it was a 2 or 7...
Well could be 1 2 or 7 but if it is 1 or 2 that means they have 5 - 6 months surplus of engines being his build date is July ...wow
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Old 08-24-2012, 08:54 PM   #2250
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I would go with a 2, makes sense, the engines usually have a 4 month lead time over the jeeps themselves.
That's what I was thinking as well. 3-4 month lead.

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