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Old 02-05-2013, 10:26 AM   #1
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Replaced Cylinder Head????????

I recently had a check engine light come on on my 2012 Jeep Wrangler Sport. The first dealership I brought the car to was able to get the light off in a matter of minutes. However, it came back on again during a roadtrip from Buffalo to Washington, D.C. I then brought the car to a dealership in D.C. They told me that there was an engine misfire and the only way to get the check engine light to go off was to replace the cylinder head. The mechanic mentioned that he believes the cylinder heads used on the 2012 Wranglers are frequently malfunctioning and often need to be replaced. I was skeptical, however, since the car was under warranty I allowed them to proceed with the work. I got my jeep back about a week later. It doesn't seem to be running as well as it was before. However, the check engine light has stayed off. The main problem I have is that my gas mileage has been greatly reduced. I was getting 21 highway and 16.5 city and I am now getting 17.5 highway and 14 city. It is driving me crazy plus the car isn't running a bit louder when I accelerate. I contacted the mechanic who replaced the cylinder head and he told me that the only way he can explain the decrease is because the gasoline is differently forumlated in the winter time and tends to burn slower and that there is nothing he can do due to the fact that the check engine light has not come back on. This seems very fishy to me. Has anyone had a similar experience?

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Old 03-15-2013, 03:53 AM   #2
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That dosent seem right

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Old 03-15-2013, 08:25 AM   #3
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I think your mechanic is being a little bit disingenuous. I'm in tech-school to become a mechanic and I've tinkered around with anything that moves since I was very little, and I've never heard anything about how gas burns differently because of how its mixed when its cold. If anything, once your motor gets hot and given that you're not at an extreme altitude, it should run better because cold air is denser therefore making the explosion in the combustion chamber hotter which is also how a CAI or snorkel gives you some HP.

Just my 2 cents. I hope I helped a bit.
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Old 03-17-2013, 11:25 PM   #4
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Originally Posted by SweetTeaDrinkerTJ98 View Post
I think your mechanic is being a little bit disingenuous. I'm in tech-school to become a mechanic and I've tinkered around with anything that moves since I was very little, and I've never heard anything about how gas burns differently because of how its mixed when its cold. If anything, once your motor gets hot and given that you're not at an extreme altitude, it should run better because cold air is denser therefore making the explosion in the combustion chamber hotter which is also how a CAI or snorkel gives you some HP.

Just my 2 cents. I hope I helped a bit.
I'm with you. I've been a mechanic for 5 years now, and while gas is formulated differently for winter, it wouldn't mess up the mileage that much. I'd go to your dealer where you bought it and talk to them and see if they can get you a better explanation on what really happened. They can use the national service history to look into it for you. If that doesn't work, contact jeep directly and file a complaint about all this. Threaten to go to the Better Business Bureau. They investigate stuff like this and fight companies who rip off customers, if you wanted to go heavy caliber. But start with your local dealer and go from there
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Old 04-30-2013, 05:05 PM   #5
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I had my head replaced within 5,000 miles. I have a two door 2012 Rubicon. I was four wheeling when the light came on and was running rough/misfiring. When the local dealer looked at it, he knew that the head was bad and said I did nothing to cause the problem. They replaced the head and I have had no problems since. The mechanic said this was the 5th or 6th he replaced. He had one that had 20K on it after the change and no problems. I recommend to go to a good dealer and have them look at it. Hope this helps.
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Old 05-02-2013, 10:53 AM   #6
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Originally Posted by meech60 View Post
I recently had a check engine light come on on my 2012 Jeep Wrangler Sport. The first dealership I brought the car to was able to get the light off in a matter of minutes. However, it came back on again during a roadtrip from Buffalo to Washington, D.C. I then brought the car to a dealership in D.C. They told me that there was an engine misfire and the only way to get the check engine light to go off was to replace the cylinder head. The mechanic mentioned that he believes the cylinder heads used on the 2012 Wranglers are frequently malfunctioning and often need to be replaced. I was skeptical, however, since the car was under warranty I allowed them to proceed with the work. I got my jeep back about a week later. It doesn't seem to be running as well as it was before. However, the check engine light has stayed off. The main problem I have is that my gas mileage has been greatly reduced. I was getting 21 highway and 16.5 city and I am now getting 17.5 highway and 14 city. It is driving me crazy plus the car isn't running a bit louder when I accelerate. I contacted the mechanic who replaced the cylinder head and he told me that the only way he can explain the decrease is because the gasoline is differently forumlated in the winter time and tends to burn slower and that there is nothing he can do due to the fact that the check engine light has not come back on. This seems very fishy to me. Has anyone had a similar experience?
It's a Jeep not a car.....
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Old 06-01-2013, 09:41 AM   #7
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I had a similar experience with my 2012 Rubicon. Had the head replaced around 18,000 and experienced a similar drop in mileage. I took it back months later, they updated software, but still the best I get is around 19mpg. My friend had her cyl head replaced on her 2012 in high 20k miles. But she has not had a drop in mpg.

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