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Old 08-12-2013, 11:18 AM   #5341
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Originally Posted by ShoreWrangler View Post
Well, the bug finally hit me yesterday. Got the check engine light with a P304 code on an extended trip yesterday. 2012 JK 15,600 miles. I did notice some ticking last year which seemed to quiet down over time. Thought maybe I was out of the woods, now I may have new heads in my future
Best it happens sooner than later! Good luck!

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Old 08-13-2013, 02:24 AM   #5342
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Ive had my Jeep back from a head replacement for 3 days now....it seems to me that she is mighty thirsty...its been showing 13mpg and it went through half a tank in two days of use...is this normal or should I take it back?

Before it was getting about 18mpg...Im not really complaining about the gas mileage on my jeep but damn its kinda odd.

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Old 08-13-2013, 11:32 AM   #5343
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Originally Posted by LuisCazarez08 View Post
Ive had my Jeep back from a head replacement for 3 days now....it seems to me that she is mighty thirsty...its been showing 13mpg and it went through half a tank in two days of use...is this normal or should I take it back?

Before it was getting about 18mpg...Im not really complaining about the gas mileage on my jeep but damn its kinda odd.
are you going by the computer or calculating actual usage? did you reset the computer? You need more than half a tank of hand calculation to figure out actual mileage.
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Old 08-13-2013, 06:55 PM   #5344
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Originally Posted by LuisCazarez08 View Post
Ive had my Jeep back from a head replacement for 3 days now....it seems to me that she is mighty thirsty...its been showing 13mpg and it went through half a tank in two days of use...is this normal or should I take it back?

Before it was getting about 18mpg...Im not really complaining about the gas mileage on my jeep but damn its kinda odd.
After my 2012 Wrangler Sahara 2-door had the head replaced at about 14,500 miles, the MPG reading was dropping as I was driving it! I too thought something was wrong. It did, however, start to eventually go up (several days). I am getting a consistent 19 mpg in mixed driving now and have hit 23 mpg on the highway during a 4 hour trip. Its a mile or so a gallon better all around since the head was replaced. I have the auto and 3.21 gears.

If you don't smell or see a gas leak, then its probably the computer relearning. Give it another several days of driving before you take it in.
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Old 08-13-2013, 08:32 PM   #5345
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+1
Mine took a couple weeks and is better than the first 10K.
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Old 08-14-2013, 01:13 AM   #5346
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are you going by the computer or calculating actual usage? did you reset the computer? You need more than half a tank of hand calculation to figure out actual mileage.
Im just going by what the computer says and the same routine driving I've been doing for the last year with my Wrangler. It is definitely using up more.
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Old 08-14-2013, 01:14 AM   #5347
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After my 2012 Wrangler Sahara 2-door had the head replaced at about 14,500 miles, the MPG reading was dropping as I was driving it! I too thought something was wrong. It did, however, start to eventually go up (several days). I am getting a consistent 19 mpg in mixed driving now and have hit 23 mpg on the highway during a 4 hour trip. Its a mile or so a gallon better all around since the head was replaced. I have the auto and 3.21 gears.

If you don't smell or see a gas leak, then its probably the computer relearning. Give it another several days of driving before you take it in.
Ohh okay I was just wondering if any one had the same issue and it wasn't just the dealership forgetting a hose or missed something.
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Old 08-14-2013, 01:29 AM   #5348
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So let me ask this... If I go to my dealer and ask for a leak down test, will they do it? I'm new to dealing with dealers and not sure how they work, but my ticking is obnoxious and it's clearly there and I really need the head replaced, don't know how much longer I can listen to it. I know the leak down will come out positive to a bad head, so am I safe making a bet with the dealer that I'll pay for it if it doesn't come through?
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Old 08-14-2013, 08:14 PM   #5349
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Is your Wrangler a 2012 or early model year 2013? If it is, and you have a definite ticking issue going on, then they shouldn't give you a hard time about doing it, especially if you'll be paying them to do it. If it doesn't turn up a failed test on the cylinders on the driver's side head, you will definitely be paying them for it.

If it will help you deal with the situation, go for it. Otherwise, just wait for the CEL, because that's what I did. Remember, you have a 5yr/100,000 powertrain warranty, so enjoy your Jeep.
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Old 08-14-2013, 08:45 PM   #5350
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Question for my October 2012 built 2013 JKUR. I thought that I was getting a rough idle from a bad tank of gas. It seemed to go away but as of yesterday I noticed it idling rough after some aggressive driving. I'm at about 9,500 miles and its a little nerve racking. Around 5,000 I started getting comfortable and getting on the throttle and I love my pentastar. I do have a lead foot so its hard to just cruise her.
Do you guys think it could still be some bad gas running its course or maybe a future cylinder issue?
I've been running 85 octane and after the rough idle I gave her 88 octane from Chevron which is mid grade here. My old Toyotas would all have a similar issue if I didn't run mid grade. Even my old 87 Toy liked mid.
I'm I just paranoid?
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Old 08-14-2013, 09:08 PM   #5351
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I believe the Pentastar V6 used in the Wranglers is designed to be operated with minimum 87 octane gas. You don't want to chance getting engine knock with less than 87 octane gas, because that means engine damage.

Stay with 87 or go to 89 or 91 octane at the most. The engine should run most efficiently with the slightly higher octane level. Anything higher than those levels are generally a waste of your money.
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Old 08-14-2013, 09:30 PM   #5352
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He's in Albuquerque, so he's considerably above sea level. I believe fuel in those parts is typically a few points lower in octane than what is supplied to those of us that are closer to sea level - the thinner air up that high effectively lowers the compression ratio of the engine, and by so doing also lowers the required detonation resistance of the fuel thus reducing the octane requirements.

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Old 08-16-2013, 06:20 AM   #5353
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Originally Posted by ShoreWrangler View Post
Well, the bug finally hit me yesterday. Got the check engine light with a P304 code on an extended trip yesterday. 2012 JK 15,600 miles. I did notice some ticking last year which seemed to quiet down over time. Thought maybe I was out of the woods, now I may have new heads in my future
Heard back from them - as suspected left side head needs to be replaced. Two week backorder for parts - Joy!
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Old 08-16-2013, 08:50 AM   #5354
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Originally Posted by RockyRiverJeep View Post
Is your Wrangler a 2012 or early model year 2013? If it is, and you have a definite ticking issue going on, then they shouldn't give you a hard time about doing it, especially if you'll be paying them to do it. If it doesn't turn up a failed test on the cylinders on the driver's side head, you will definitely be paying them for it.

If it will help you deal with the situation, go for it. Otherwise, just wait for the CEL, because that's what I did. Remember, you have a 5yr/100,000 powertrain warranty, so enjoy your Jeep.
Yeah I may just wait for the CEL but if it gets any louder I will definitely take it in.
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Old 08-16-2013, 03:31 PM   #5355
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Mine started a strange loud clatter this morning. Actually heard it above my radio at a stoplight. Just rolled 15,600 on the odometer. Definitely not a fuel injector tick either. It almost sounds like a rod knocking, but it's nowhere near that loud.

Damnit.
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Old 08-16-2013, 06:20 PM   #5356
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I have been reading this post and getting more and more pissed off at Chrysler. Finally decided to trade in my 2012 for a 2014. Dealer sales people have no idea what's going on. Some poor SOB will buy the 2012's used and go through all the BS.
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Old 08-16-2013, 07:17 PM   #5357
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I was going to trade my 2012 Wrangler in for 2014. The ticking was bothering me too. I did eventually get the head replaced a few months ago due to CEL surfacing. Now it is much quieter and has been getting better mileage, and all is well.

I figured I'd just keep it because, well I liked it, and I wanted to see if this head issue is resolved, once and for all. I didn't want to trade one headache for another potential headache - no pun intended. If it's fixed, I'll probably trade in on 2015 or 2016 at the latest. Maybe by that time they'll have the 8 speed automatic in it.
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Old 08-16-2013, 07:51 PM   #5358
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I have been reading this post and getting more and more pissed off at Chrysler. Finally decided to trade in my 2012 for a 2014. Dealer sales people have no idea what's going on. Some poor SOB will buy the 2012's used and go through all the BS.
Just get replaced, my dealer replaced it in one day, the Jeep run great love it. The service manager at my dealership calls me at least once a month and ask is there anything that we can do for you today… that's what I call service…
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Old 08-16-2013, 08:25 PM   #5359
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All you people running to trade in your 2012 Jeeps are funny. It has a damn 5 year 100K mile engine warranty. It WILL get fixed. It WONT cost you anything. Its just a head replacement, nuts and bolts. Some of you act like its open heart surgery in the Congo. Mine ticks and clatters like crazy. I will just wait until the light comes on.
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Old 08-16-2013, 08:39 PM   #5360
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He's in Albuquerque, so he's considerably above sea level. I believe fuel in those parts is typically a few points lower in octane than what is supplied to those of us that are closer to sea level - the thinner air up that high effectively lowers the compression ratio of the engine, and by so doing also lowers the required detonation resistance of the fuel thus reducing the octane requirements.

-Pat
Good reply. I hadn't given that much thought. Looks like mid grade from now on. I'm at 5,200 ft of elevation. I can still duplicate my rough idle by romping on the accelerator. She has more get up now than at first. Of course the newness babying in done. I figure my 5 yr power train warranty will need to be tested. I've moved the temp gauge to 3/4 running steep grades near Needles, Ca in 118 deg temps and I constantly see what my Rubi can and can't do climbing in the high desert. So far though no codes and 16 - 17 combined mpg. That includes wheeling each weekend and daily driving at 5200'.
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Old 08-16-2013, 09:00 PM   #5361
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All you people running to trade in your 2012 Jeeps are funny. It has a damn 5 year 100K mile engine warranty. It WILL get fixed. It WONT cost you anything. Its just a head replacement, nuts and bolts. Some of you act like its open heart surgery in the Congo. Mine ticks and clatters like crazy. I will just wait until the light comes on.
^^^Agreed. No rush here, when it happens it will be covered and we're enjoying it now.
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Old 08-17-2013, 05:11 AM   #5362
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So let me ask this... If I go to my dealer and ask for a leak down test, will they do it? I'm new to dealing with dealers and not sure how they work, but my ticking is obnoxious and it's clearly there and I really need the head replaced, don't know how much longer I can listen to it. I know the leak down will come out positive to a bad head, so am I safe making a bet with the dealer that I'll pay for it if it doesn't come through?
If they suspect a problem such as a bad head and you have a CEL they'll probably do it before swapping the head. No CEL, no leak down test, unless you want to pay for it.
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Old 08-17-2013, 07:22 AM   #5363
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Just get replaced, my dealer replaced it in one day, the Jeep run great love it. The service manager at my dealership calls me at least once a month and ask is there anything that we can do for you today… that's what I call service…
You have a GOOD dealership! I brought in our first 2012 with a sticking hill-holder and they had it 45 days before they figured it out and gave it back with a fender scratch which of course said was there when I brought it in. I know another guy who had his JK serviced at the dealer and drove off with NO oil in the crankcase. The 2012's have issues, whether it be AA heads or bad water pumps. The good news is that the trade-in values are so high, one can drive for free for 15K miles and get a fresh one with hopefully less flaws!
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Old 08-17-2013, 08:47 AM   #5364
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[QUOTE="socal-jk;4087411"]All you people running to trade in your 2012 Jeeps are funny./QUOTE]

What do you mean YOU people? Lol just kidding around. Dec 11 build almost 47k and still driving the piss out of it. No tick other than normal
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Old 08-17-2013, 11:27 AM   #5365
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D-day 2012 build 16400mi no tick yet.
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Old 08-17-2013, 07:30 PM   #5366
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Mine has started ticking more and more often and i've only got 2900 miles. It used to tick after it sat for a few days, now it ticks after sitting for an hour. O-well, when it throws a code i'll get it worked on.
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Old 08-18-2013, 04:53 AM   #5367
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Mine has started ticking more and more often and i've only got 2900 miles. It used to tick after it sat for a few days, now it ticks after sitting for an hour. O-well, when it throws a code i'll get it worked on.
Do you have a build date?
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Old 08-18-2013, 02:50 PM   #5368
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all you people running to trade in your 2012 jeeps are funny. It has a damn 5 year 100k mile engine warranty. It will get fixed. It wont cost you anything. Its just a head replacement, nuts and bolts. Some of you act like its open heart surgery in the congo. Mine ticks and clatters like crazy. I will just wait until the light comes on.
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Old 08-19-2013, 04:36 PM   #5369
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Do you have a build date?
I posted it earlier in the thread here.

Jun 2012
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Old 08-19-2013, 05:44 PM   #5370
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Just a heads up to everyone. Yesterday I realized my engine coolant was almost non existent. I got my driver side head replaced around ~40 days ago. I went to the dealer today and everything tested fine and the filled it for free...no leaks anywhere and they took care of everything fast. The head replacement paperwork said they purged the coolant during testing and refilled and purged the air however apparently there was still air pockets that used up all remaining coolant...odd. I went back to work and let my coworker know the results. He went out to his jk which got a head replacement about 3 weeks ago and found his had almost no coolant either...now mind you we each went to a different dealer for warranty repair work on the heads...my mind is boggled, good thing we caught this. Not sure if its a common issue or we're just 2 unlucky fools haha. However I was pleased how fast the dealer was today with testing and fixing the issue, all for free.

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