The dealer just called and said the new ticking noises are just the fuel injection. How come it didn't do it the first 3000 miles?

 

They all know about the penta problem....I'm in Canada and bought my jeep in Quebec and even the finance guy and sales manager knew about it and said if I ever had any issue with the 2013 to bring it in it's all under warranty.

 

Because the engine really never gets broken-in before the head tic begins you don't get to the optimum mpg; at least I didn't. This meant before I knew my head was faulty, low mpg could have been a problem. My mpg before the head replacement was around 17. Because of the fact that I knew my engine wasn't broken-in yet I didn't get overly excited.

My head was replaced at around 3300 miles. Immediately afterward, 50 miles beyond the replacement, I was averaging around 19.5-20 mpg. I'm know getting a combined city/highway of close to 21 mpg never below 20 on my dash gauge. A lot of factors contribute to better mpg ratings. One of them is summer warm temperatures where the engine oil isn't as thick as pudding at sub-zero temps when you first start up. This makes a huge difference not just in my Jeep but with every car I've ever owned.

Where are you coming up with the motor starting to run hot as causing the problem and running bad? I never experienced my engine running any hotter when this tic develops. Beside other then seeing your temp gauge go up how would you know your engine is running hotter in any accurate manner?

 

They already changed the head. It was ticking worse after which is why I dropped it off. I just picked it up and all of a sudden there is no ticking. strange.

 

thats funny, down here in louisiana mpg's get better in the winter and get worse in the summer. it gets so hot and humid not to mention the a/c will always be on in the summer. but i got the heat thing from a couple articles i read on the internet. they said that chrysler blamed the problems that develop with the heads as a result of batches of heads not having all of the casting slag properly removed from the water passages in the heads when the final machining and polishing was done to them. resulting in smaller than normal areas in the water passages and not allowing proper flow of coolant. the damage can be the result of the motor running a little hot all the time. but not off the chart hot. nothing will screw a motor up worse than to much heat. for a every day driver it may take 3,000 mile or so to become a problem. for a guy who takes it offroad and pushes it a little the problems might surface a little sooner because of the extra strain that is placed on the motor. thats where the vague "certain driving habits" bs comes from. its kind of like putting two roast in two different ovens. one set at 200 degrees and one set at 400 degrees. the one at 200 degrees is going to take twice as long to cook as the one thats at 400 degrees but at some point they are both going to be cooked.

 

Chrysler has never said excess heat is causing the valve train tic. Then again a lot of stuff Chrysler is saying, concerning this problem, doesn't make much sense. That's their way of getting around this mess, keep everybody guessing and in the end they will say it was only a minor glitch. The question is; when is the end and at what financial damage to Chrysler and the consumer, long term and short.

 

You mean never buy a '12 Jeep!

 

Why not? If it's got a problem (and apparently...few do except on this forum) - it will be fixed under warranty.

 

I've got a 5 year/100,000 mile drivetrain warranty. I'm not worried in the least about this costing me anything but a few hours of time dealing with it. It's Chrysler's problem, not mine.

I've only got 1200 miles on the odometer so far, and if I do develop the problem, it's more than likely that it'll be far enough out that the new, re-designed heads will be in plentiful supply. Meaning that, at no cost to me, I'll get a 2013 model engine (or at least the top end, anyway) in my 2012 JKU. In the meantime, I'm enjoying using the passing lane again and being able to merge onto the interstates without feeling like I'm rolling the dice on each on-ramp.

 

Ok. How bout never buy a used '12 Jeep? At least not without proof that it has the redesigned heads installed....

Any of the "first gen" Pentastar motors are to be avoided.