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Old 09-26-2011, 12:12 AM
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2011 Jeep GC Surge/Shudder/ engine miss sensation

To All that have a 2011 Jeep GC... Are any of you still having the surge/shudder/engine missing sensation in the 35 to 60 ish mph speed range under light throttle acceleration? A harder push on the throttle and it goes away? Does not appear to be there with cruise on.

I purchased my GC Overland with the 5.7 Hemi, QT2 in Aug of 2011. It is a May build I think (I need to double check that). I have about 3000 miles on it now and it seems worse at times on the same roads and under similar weather conditions. Seems like it is a strange characteristic that may tie back to some "auto" feature. I have tried different transfer case modes and anti-slip on and off. Not sure if I need dealer to do the TSB Flash, or what... What say you?
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Old 10-07-2011, 02:14 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

I am in at the dealer now for the TSB Flash. We will see if this helps.
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Old 10-08-2011, 08:00 AM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

It will help but it won't clear it up completely.

I've come to the conclusion this is more of a characteristic than a problem and I've become accustom to it. If it's bugging me I drop it back to 4th which changes the parameters for MDS and converter lockup and it feels smoother.

Sure, it sucks to have to do this but it's not enough for me to spend the time at the dealer or really tarnish my overall like of the vehicle.
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Old 10-08-2011, 05:50 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

I'm havin it in the 40-60 mph cruising range. I defintely feel it after letting off the gas. It's getting very annoying. I am thinking about taking it in soon to be looked at. I've already supposedly had the TSB reflash done according to the dealer. I mentioned I was havin this surging, missing sensation last month when I was having the oil changed and they claimed the TSB had already been done and that it must be my MDS and that it was completely normal.
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Old 10-15-2011, 06:54 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

Mine seems to do it only between 35 and 55 after I let off the gas and then give it just enough gas to maintain speed. Push a little more on the gas and the missing sensation goes away. My Overland is a Feb 2011 build with the V8.
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Old 10-15-2011, 11:58 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

Quote:
Originally Posted by RTejral View Post
I am in at the dealer now for the TSB Flash. We will see if this helps.

did it work fine after the flash???
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Old 11-04-2011, 03:29 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

I have 2011 Overland 5.7 and this misfire gets WORSE as miles get on. I am at 36,000Km now and this is worse than ever and Chrysler wipes there hands of it saying now it is "controlled misfire" and nothing to be done. NO explanation as why it is getting worse. Pulled spark plugs myself and they look awful...appears huge variations between some cylinders as some plugs white and others dark.
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Old 11-04-2011, 08:03 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

I'm taking it back again for the third time next week. I'm really getting tired of this. I've only had the truck four months.
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Old 11-04-2011, 08:28 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

This is ridiculous. Did yours do it from new? What has dealership said is going on with it?
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Old 11-04-2011, 08:35 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

Chrysler customer service was no help and has no technical background at all...seemed to be reading off a standardized response....."there are no codes present so vehicle is fine".

MORE of us need to press hard with service managers to force a fix for this. I would live with this IF it had this issue since new or stayed at a minor amount as when truck was a month old but it has gotten worse and now at 50 - 60 mph cruising and let MDS engage, there is a vibration throughout the vehicle along with the "missfire".
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Old 11-14-2011, 05:02 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

I'm glad to know that I'm not the only one that is seeing this issue. I bought a 2011 GC Overland Summit in August and the issue with engine shuttering is getting worse. I took it to the dealership three times and two times they said they did a reflash. It seemed to get better at first but it's doing it again and more frequent. I even changed the type of gas I put in it just to see if the cheap QT gas wasn't working for it. I'm highly irritated and I'm starting to consider trading it in but really hate the thought of losing thousands of dollars as I've only had it a few months. It is a very nice SUV but it's tough to enjoy something with a major engine flaw! I hope somebody finds the answer very soon!
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Old 11-14-2011, 05:42 PM
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Re: 2011 Jeep GC Surge/Shudder/ engine miss sensation

Dear all,

Perhaps this helps in clarifying the situation:

I have been fighting with this issue since June (misfire sensation under light acceleration) and had the car inspected, tested by a number of engineers, and no solution has been found (applied all TSBs for driveability, which made the gearbox itself smoother in changing gear, but resolved none of these sypmtoms).

So, how does the misfire/surge/shudder sensation manifests itself?

1) In 4th and 5th gear once the torque converter has locked up
2) Whilst accelerating softly enough so that the car does not unlock the torque converter and changes down a gear
3) From 40mph+, between 2000-2500 rpm
4) In all modes, Auto/sport etc, as well as in D or Autostick (when allegedely the MDS is not operational)
5) When driving at 70-80mph, I also get a slight vibration "driving over washboard effect", particularly when driving up a slight incline with the cruise control on.

The technical explanation given to me 3 times now by the service manager who has spent hours in friendly conversations with me:

1) Connecting the laptop to the ODC whilst driving, he could see that under the conditions described above the torque converter keeps locking in/out in succession, within few hundreds of a second

2) This is driven by the MDS software, the MDS needs the torque converter to lock/unlock when engaging/disengaging

3) This command to the torque converter is given also when in Autostick mode, and it exhibits the same behaviour, although the MDS is allegedely not active

4) The issue does not occur in lower gears because the torque converter does not lock up

5) Subsituting the torque converter will not improve things as mechanically there is no slip or any loss in it at all

A Starcase is open at Chrysler to look into the issue.

Do I believe all of this? Well, who knows.
The only doubt that I have is whether the 4x4 system has any play in this at all.
The question back to you folks: do you all have 4x4 and accuse these symptoms?

The Jury has emitted its verdict though: that is the way the car is and will remain. I wanted to switch to the 2012 model, until I found out that the gearbox is exactly the same, just reprogrammed.

Appalling, as a drivetrian issue as serious as this on this type of vehicle is enough to steer customers away. I come from a history of bmw and audis, and no way they exhibilt any form of embedded mechanical imperfection. Some have issue, yes, but they do not come with a drivetrain issue as standard.

All the best,

Daniele
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