Update on ticking Pentastar..new head... - Page 154 - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 04-12-2013, 01:10 PM   #4591
Jeeper
 
Join Date: Apr 2013
Posts: 30
ok, but honestly - on an engine with just 3730mls any of those issues means nothing but really lousy build/design-quality.

where is the time of big six engines of the 80" (like the one in my BMW E24 635CSi)? those engines made 3-400.000mls and after 25-30 years of abuse are still running with no major issues...

PET77 is offline   Quote Quick Reply
Old 04-12-2013, 01:17 PM   #4592
Jeeper
 
Rabuck's Avatar
 
Join Date: Jan 2012
Location: Baltimore, md
Posts: 356
Quote:
Originally Posted by ekdigdirt View Post

Hmm...smells like BS to me. They can run a scan whether the CEL is on or not. That's too bad - I'm not sure why they aren't just issuing a recall notice for this problem. People shouldn't have to beg to have a vehicle that runs properly and passes inspection when they KNOW the problem exists.
I would think with these reoccurring would at least test the head see what % they are running and if its weak then replace if not then try computer but guess not so like I heard before its just a waiting game untill light pops back on... What happens if it waits untill 5yr 1 day or 100,001 miles :/

Rabuck is offline   Quote Quick Reply
Old 04-12-2013, 01:20 PM   #4593
Jeeper
 
Join Date: Mar 2013
Posts: 33
Quote:
Originally Posted by PET77 View Post
ok, but honestly - on an engine with just 3730mls any of those issues means nothing but really lousy build/design-quality.

where is the time of big six engines of the 80" (like the one in my BMW E24 635CSi)? those engines made 3-400.000mls and after 25-30 years of abuse are still running with no major issues...
My dad has a 1920-something (1930?) Ford that still runs.
Attached Thumbnails
Click image for larger version

Name:	321342_2388326788037_7760310_n.jpg
Views:	36
Size:	44.8 KB
ID:	235206  
ekdigdirt is offline   Quote Quick Reply
Old 04-12-2013, 01:30 PM   #4594
Jeeper
 
Join Date: Mar 2013
Posts: 33
Quote:
Originally Posted by Rabuck View Post
I would think with these reoccurring would at least test the head see what % they are running and if its weak then replace if not then try computer but guess not so like I heard before its just a waiting game untill light pops back on... What happens if it waits untill 5yr 1 day or 100,001 miles :/
Oh, don't worry. It definitely won't be that long.
ekdigdirt is offline   Quote Quick Reply
Old 04-12-2013, 05:10 PM   #4595
Jeeper
 
Join Date: Apr 2013
Posts: 30
Quote:
Originally Posted by ekdigdirt View Post
My dad has a 1920-something (1930?) Ford that still runs.
Thumbs up:-)
PET77 is offline   Quote Quick Reply
Old 04-12-2013, 05:27 PM   #4596
Jeeper
 
Join Date: Feb 2013
Posts: 30
Quote:
Originally Posted by stans1stjeep View Post
You will need to transfer the warranty to your name first. Go to a Jeep dealer of your choice and have them do the transfer paperwork. There will be a charge for this.

Idk, I bought mine used through Carmax (a 2012) and our local Jeep dealership replaced my head with no questions asked about the warranty. Seems odd that you would need to xfer. ...esp at cost?
rigormortis is offline   Quote Quick Reply
Old 04-13-2013, 04:34 PM   #4597
Jeeper
 
Join Date: Apr 2013
Posts: 30
Hi, guys. Been trying to understand, where exactly the problem lies and how this "misfire" appears. To be honest however, I couldnt really find any plausible engineering description of the problem. Mostly just bunch of myths and misconceptions. Is there anybody out there, who would be able to shed some light into this one? Does anybody know, whether Chrysler already published (ofcourse internally) problem explanation and solution for their repairing staff? What I want to get to is to understand the core of the problem and thus be sure whether the issue will be cured by whatever my dealer will do or the problem is inherent and I have to adapt the way I drive my car to prevent the issue from happening again...
PET77 is offline   Quote Quick Reply
Old 04-13-2013, 04:49 PM   #4598
Jeeper
 
Rabuck's Avatar
 
Join Date: Jan 2012
Location: Baltimore, md
Posts: 356
Quote:
Originally Posted by ekdigdirt View Post

Oh, don't worry. It definitely won't be that long.
Haha so got my jeep back Thursday night and CEL comes on today Saturday maybe put 100 miles on it! So made an appointment to drop off Monday morning!
Rabuck is offline   Quote Quick Reply
Old 04-14-2013, 06:26 AM   #4599
Jeeper
 
Join Date: Apr 2013
Posts: 30
Hey guys,

Could you help me get to the bottom of the reasons for the pentastar head issue to occur?

From what I could see, there seem to be 2 rumored reasons for the misfires on the (mainly) driver’s side head:

a) a fault in design of the valve train,
- if that was the case, why would only one side be concerned and also why different cylinders would be concerned?

b) a fault in design of the exhaust ports.
- if only one side in concerned, does that mean that the head (cooling/exhaust port) design is different from each other?

c) a fault in choice of materials for exhaust valves and valve seats
- most unlikely, as this would be an easy fix and Chrysler would not authorize a head replacement if that was the case.

What I would like to do is to gather as much as possible intel as to what are that the reasons the supposed only 1% of the Pentastar engines develop this problem.

One of the theories I would like to put to the test right now is material
weakening (speaking about the exhaust valves&seats) caused due to prolonged heavy use of your engine (aka long term highway driving). In other words, the question is whether the material of the valves/seats could have been weakened due to high temperature (poor cooling) caused by the design of the exhaust ports. The weakening would obviously be more prominent if the car would see some prolonged heavy use of the engine, such as long high speed drives on the highway. From what I could tell, this in fact seems to be the case with at least some of us (and me for that matter – since my engine developed the CEL and other symptoms right after one 650mls run, which I took at quite a high speed – around 90mls/hour).

Therefore could you please post some info about the way you used your car prior to the P030x code?
PET77 is offline   Quote Quick Reply
Old 04-14-2013, 08:22 AM   #4600
Jeeper
 
Schocker65's Avatar
 
Join Date: Sep 2012
Posts: 73
My CEL came on while I was doing some wheeling in 4 Lo. It had developed a misfire perhaps 1 to 2 weeks prior to throwing the CEL. Coincidentally, my wife had filled my Jeep a week before the misfire at a no name gas station.

My belief is that there was a combination of casting/machining mistakes on these heads that left them vulnerable to the relatively higher temps inherent to the integrated exhaust manifold design. Bad gas, off-roading, high speed highway running, etc. just serve to exacerbate the heat issue.

Hopefully, the changes made for the AC series heads have imparted enough margin to enable them to last as long as the rest of the engine....

My $.02
Schocker65 is offline   Quote Quick Reply
Old 04-14-2013, 10:05 AM   #4601
Dance w/me tonight

WF Supporting Member
 
jkucod12's Avatar
 
Join Date: Jul 2012
Posts: 1,135
Images: 8
FYI: the newest heads are AD.
jkucod12 is online now   Quote Quick Reply
Old 04-14-2013, 10:23 AM   #4602
Jeeper
 
rox-n-mud's Avatar
 
Join Date: Apr 2013
Posts: 513
Quote:
Originally Posted by jkucod12 View Post
FYI: the newest heads are AD.
That is interesting. Got the tick. No cel yet. Maybe by that time we'll be up to the "r" version! Ha!
rox-n-mud is offline   Quote Quick Reply
Old 04-14-2013, 12:00 PM   #4603
Jeeper
 
Join Date: May 2011
Posts: 2,469
Quote:
Originally Posted by jkucod12 View Post
FYI: the newest heads are AD.
Are you sure? If so that means the AC head wasn't the fix either.
demarpaint is offline   Quote Quick Reply
Old 04-14-2013, 12:11 PM   #4604
Dance w/me tonight

WF Supporting Member
 
jkucod12's Avatar
 
Join Date: Jul 2012
Posts: 1,135
Images: 8
Subject AD heads:

I'll post picture or pictures on April 18, 2013
jkucod12 is online now   Quote Quick Reply
Old 04-14-2013, 12:33 PM   #4605
Jeeper
 
aypanthony's Avatar
 
Join Date: May 2012
Posts: 311
I thought the driver side was up to AD. AC was the latest revision for the passenger head.
aypanthony is offline   Quote Quick Reply
Old 04-14-2013, 12:35 PM   #4606
Jeeper
 
Join Date: May 2011
Posts: 2,469
Quote:
Originally Posted by aypanthony View Post
I thought the driver side was up to AD. AC was the latest revision for the passenger head.
That is what I thought but I'm really not sure.
demarpaint is offline   Quote Quick Reply
Old 04-14-2013, 12:52 PM   #4607
Jeeper
 
Blastek's Avatar
 
Join Date: Mar 2012
Location: Portland, OR
Posts: 2,343
AD is passenger side. AC is drivers side
__________________
2012 Deep Cherry Red JKU Sport S - Tickastar, 6 speed, 3.73, Dual Tops
Blastek is online now   Quote Quick Reply
Old 04-14-2013, 01:15 PM   #4608
Jeeper
 
Seeuoffroad's Avatar
 
Join Date: Oct 2012
Posts: 318
Wow. Found the stamp on the head but couldn't make out Sh*t. Used a Magnifier, mirror,regular flashlight, led flashlight
Door build date 2/2012...... 31,000 miles and zero issues. Great mileage, sounds and runs great no codes. Nothing. Talked to the service manager at my dealer. He looked up my warranty and said you have 1000,000 mile 5 year on the head.
Don't worry about it. It goes bad I'll warranty it.
Seeuoffroad is offline   Quote Quick Reply
Old 04-14-2013, 01:22 PM   #4609
Jeeper
 
Blastek's Avatar
 
Join Date: Mar 2012
Location: Portland, OR
Posts: 2,343
Quote:
Originally Posted by Seeuoffroad View Post
Wow. Found the stamp on the head but couldn't make out Sh*t. Used a Magnifier, mirror,regular flashlight, led flashlight
Door build date 2/2012...... 31,000 miles and zero issues. Great mileage, sounds and runs great no codes. Nothing. Talked to the service manager at my dealer. He looked up my warranty and said you have 1000,000 mile 5 year on the head.
Don't worry about it. It goes bad I'll warranty it.
You have an aa head.
__________________
2012 Deep Cherry Red JKU Sport S - Tickastar, 6 speed, 3.73, Dual Tops
Blastek is online now   Quote Quick Reply
Old 04-14-2013, 01:37 PM   #4610
Jeeper
 
Seeuoffroad's Avatar
 
Join Date: Oct 2012
Posts: 318
That's what I thought. Almost be impossible not to. Talking to the service manager he told me from what he understands is that not all AA heads were bored or planned incorrectly.
Seeuoffroad is offline   Quote Quick Reply
Old 04-14-2013, 02:54 PM   #4611
Jeeper
 
Join Date: Apr 2013
Location: Burbank, CA
Posts: 347
Hey Everyone...new member here. I'd like to download this entire thread for reading on the airplane....does anyone know how to do that?

Thanks!
socalwk is offline   Quote Quick Reply
Old 04-15-2013, 07:50 AM   #4612
Jeeper
 
hwy1rubi's Avatar
 
Join Date: Feb 2012
Posts: 643
What do you suppose this is doing to the resale value?
hwy1rubi is offline   Quote Quick Reply
Old 04-15-2013, 08:38 AM   #4613
Jeeper
 
rox-n-mud's Avatar
 
Join Date: Apr 2013
Posts: 513
Quote:
Originally Posted by hwy1rubi View Post
What do you suppose this is doing to the resale value?
There's really no mass public knowledge yet, a recall might be harmful. We get pretty into these forums but the people that are on these forums are a very small percentage of all wrangler owners. Not to mention its not even all the 2012's. If I had to lay down a bet I'd say no recall and Jeep will only fix the ones with problems for no other reason than to keep it under raps. The Wrangler is second in resale only to the corvette and Jeep likes it that way.
rox-n-mud is offline   Quote Quick Reply
Old 04-15-2013, 11:44 AM   #4614
Jeeper
 
Rabuck's Avatar
 
Join Date: Jan 2012
Location: Baltimore, md
Posts: 356
Dropped my jeep off last night due to CEL coming back on <100 mile after computer updated. Just talked to service they are going to replace my head, they have in stock, said should be done tomorrow
I have no problems with this but they did however say a rental would be on me is this right or do I call Chrysler?
Rabuck is offline   Quote Quick Reply
Old 04-15-2013, 12:09 PM   #4615
Jeeper
 
Blastek's Avatar
 
Join Date: Mar 2012
Location: Portland, OR
Posts: 2,343
Quote:
Originally Posted by Rabuck View Post
Dropped my jeep off last night due to CEL coming back on <100 mile after computer updated. Just talked to service they are going to replace my head, they have in stock, said should be done tomorrow
I have no problems with this but they did however say a rental would be on me is this right or do I call Chrysler?
Chrysler should cover your rental. Call 1-877-IAMJEEP
__________________
2012 Deep Cherry Red JKU Sport S - Tickastar, 6 speed, 3.73, Dual Tops
Blastek is online now   Quote Quick Reply
Old 04-15-2013, 01:14 PM   #4616
Jeeper
 
Join Date: Mar 2013
Posts: 33
Quote:
Originally Posted by Rabuck View Post
Dropped my jeep off last night due to CEL coming back on <100 mile after computer updated. Just talked to service they are going to replace my head, they have in stock, said should be done tomorrow
I have no problems with this but they did however say a rental would be on me is this right or do I call Chrysler?
You'd have to check your warranty but I can't imagine Chrysler not covering the loaner vehicle. Every time I brought mine in, I received a loaner at no charge.
ekdigdirt is offline   Quote Quick Reply
Old 04-15-2013, 07:19 PM   #4617
Jeeper
 
Join Date: Nov 2012
Posts: 21
Quote:
Originally Posted by subearu View Post
On my '12 JKU, my 8/11 door jamb date and 2331 etched on the left head would put mine at about mid August. Just over 5k miles since I bought it in July of this year ('12), I thought the tick sounded like a knock from inside the cabin the first time I heard it.

No noticeable impact on MPG or other drive-ability so far, guess I wait until the CEL goes.

-Brian
8100 on the odo now and nothing changed, no CEL or other driveability issues. I can understand the trouble trying to record the sound, the mic in the phones isn't our ears. I can easily hear the "tick" just standing on the driver side with the hood closed, but the phone video can't really. Opening the hood introduces the normal injector noise, making it harder to pickup in the audio. The best I was able to get was this video starting on the driver side (left) and heading to the front wheel well and then a quick walk to the passenger (right) front wheel well for comparison.

IMG_3029[1] - YouTube
__________________
2012 JKU Sahara Flame Red
Body colored hard top, Trailer Tow, Connectivity Package
Added: 13" Eurostyle flexible antenna, Bestop SuperTop NX, WeatherTech Floor Liners, Spiderwebshade Trailmesh, Midland 75-822, Cooltech GateMount, 3' Firestik, Rubicon X wheels, BFG Mud Terrains

subearu is offline   Quote Quick Reply
Old 04-15-2013, 10:13 PM   #4618
Supporting Member

WF Supporting Member
 
SilverSport's Avatar
 
Join Date: May 2011
Posts: 22,130
Send a message via Yahoo to SilverSport
Maybe its me but I'm not hearing a tick.
__________________
"Own a Jeep and own a piece of history."

"The Hunter is not concerned with the opinion of the Wolf."
SilverSport is offline   Quote Quick Reply
Old 04-15-2013, 10:24 PM   #4619
Jeeper
 
Join Date: Nov 2012
Posts: 21
Exactly my point, it's a hard noise to get accurately on video. My stance is the same as before, I'll see if it ever throws a CEL if indeed it does have the issue and go from there.
__________________
2012 JKU Sahara Flame Red
Body colored hard top, Trailer Tow, Connectivity Package
Added: 13" Eurostyle flexible antenna, Bestop SuperTop NX, WeatherTech Floor Liners, Spiderwebshade Trailmesh, Midland 75-822, Cooltech GateMount, 3' Firestik, Rubicon X wheels, BFG Mud Terrains

subearu is offline   Quote Quick Reply
Old 04-15-2013, 11:12 PM   #4620
Jeeper
 
Join Date: Mar 2013
Posts: 112
Quote:
Originally Posted by ekdigdirt View Post
You'd have to check your warranty but I can't imagine Chrysler not covering the loaner vehicle. Every time I brought mine in, I received a loaner at no charge.
Ok I'm a tech & replaced plenty of these mainly on mini vans though. You can get a rental if we keep the vehicle more then a day under warranty. But it doesn't take me a day once I have all parts on hand.

Now to answer you folks question about the problem with them. It's a valve seat/guide issue with them. And normally it's an exhuast valve not sealing with around 80% leakage when checked with a leak down tester. I have heard it was a machining issue on the left bank head. And you say why not the other side? Well the sides are different and that means one side is set-up on one machine & the other side is on another machine. Maybe that helps you understand a bit about it. And they all have a little lifter tick to them, even after the new head install.

__________________
ASE Certified Master Tech
Chrysler Certified Tech - bringing you info straight from the stealership on the cheap.
crawlin_archer is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How can you tell if your head or head gasket is cracked/blown? archt JK General Discussion Forum 5 10-19-2012 12:43 PM
Head Unit won't turn on anymore?? BlackMountain JK General Discussion Forum 17 05-15-2011 06:17 PM
Really bummed...cracked head? rospan TJ General Discussion Forum 5 04-03-2011 11:58 AM
I need a head... oops... a 4.0 head! kllrdana TJ General Discussion Forum 2 03-26-2011 05:36 PM
Head Unit Jacked!!! TJChris27 TJ General Discussion Forum 15 03-25-2011 04:20 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 10:43 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC