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  #25  
Old 01-18-2011, 09:50 AM
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Re: HEMI hestitated and "shook" during W.O.T.

Good news everybody! I think... Just got a message from Chrysler. There is a new software update that should fix our problem

Update: RRT11-002

I don't have time to go to the dealer today, but I'll be going soon.
Hope this solves our problem. Good luck!
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  #26  
Old 01-23-2011, 08:12 PM
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Re: HEMI hestitated and "shook" during W.O.T.

Jeff, did you have this fix implemented on your vehicle? Any feedback or improvement?
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  #27  
Old 01-24-2011, 11:47 AM
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Re: HEMI hestitated and "shook" during W.O.T.

Quote:
Originally Posted by litespeedz View Post
Jeff, did you have this fix implemented on your vehicle? Any feedback or improvement?
Going in on the 27th. However I've read that others tried the update with no luck. One person even stated it made the shudder worse and now they will get a new torque converter.

I'm not optimistic.

I'm not giving up though. I think they know there is an issue and I'm confident they will get it fixed.

Dispite my issues I'm not sure there is another vehicle I'd rather be driving. I drove a 2011 BMW X5 Turbo Diesel all weekend. It is sweet and I loved it...BUT there is no way I'd take it off road. I'm much happier in a WK2.
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  #28  
Old 01-24-2011, 05:53 PM
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Re: HEMI hestitated and "shook" during W.O.T.

Ok, keep us posted! I had this documented. Jeep called to follow-up on my survey and asked about this. I told them no change as of 2,500 miles. The low rpm, shudder seems to have gone away. But the 45mph WOT for pass maneuver seems to be the same or worse. They said it was unusual but would document and look into it. The dealership has also documented it.

Have you tried to replicate it with the ESC off? Or in Tow/Haul mode? It's been too cold and I haven't been able to test it.
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  #29  
Old 01-24-2011, 06:00 PM
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Re: HEMI hestitated and "shook" during W.O.T.

Quote:
Originally Posted by JEEF View Post
Going in on the 27th. However I've read that others tried the update with no luck. One person even stated it made the shudder worse and now they will get a new torque converter.

I'm not optimistic.

I'm not giving up though. I think they know there is an issue and I'm confident they will get it fixed.

Dispite my issues I'm not sure there is another vehicle I'd rather be driving. I drove a 2011 BMW X5 Turbo Diesel all weekend. It is sweet and I loved it...BUT there is no way I'd take it off road. I'm much happier in a WK2.
Don't hold your breath my good man.
They had the same "shudder" issue right through WK, they knew there was an issue, had various TSB's, yet they never came up with a fix.
Now, with basically the same driveline, they still have the problem....... kinda tells you a lot about the company.
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Old 01-24-2011, 07:35 PM
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Re: HEMI hestitated and "shook" during W.O.T.

Quote:
Originally Posted by Marlin View Post
Don't hold your breath my good man.
They had the same "shudder" issue right through WK, they knew there was an issue, had various TSB's, yet they never came up with a fix.
Now, with basically the same driveline, they still have the problem....... kinda tells you a lot about the company.
is right! I didn't know there was an issue with the WK. I was lucky with my '05 5.7 WK. I drove the snot out of it and never had a shudder.

I never followed TSB's before. I wonder what did and did not get updated with my WK. Other than the no black interior option I loved it.

There seems to be plenty of WK2's out there without the shudder. If that is true a software change doesn't sound like the answer to me. To me it sounds like bad parts. Like the front axle isolator or torque converter. Expensive stuff that would be a nightmare to replace.

But what the hell do I know.., maybe there was a full moon when the shudder Jeeps were built.
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  #31  
Old 01-24-2011, 07:39 PM
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Re: HEMI hestitated and "shook" during W.O.T.

lol

Really, I think it's something you just learn to live with, something you learn to kinda just "drive around". Not really a satisfactory answer, but pretty bloody obvious to any WK1 owner! lol
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Old 01-24-2011, 10:46 PM
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Re: HEMI hestitated and "shook" during W.O.T.

Quote:
Originally Posted by JEEF View Post
There seems to be plenty of WK2's out there without the shudder. If that is true a software change doesn't sound like the answer to me. To me it sounds like bad parts.
I posted in another thread (can't find it now) that I believe those experiencing a serious shudder with the Hemi have a mechanical problem with the MDS. If the MDS-cylinders do not properly hold the combustion gases in compression, that theoretically would make the engine shudder badly; that's why the MDS,when activated, shuts down the cylinders with the combustion gases remaining compressed and intact in those cylinders. That is the first thing that came to my mind when I experienced MDS in action. I can feel the Hemi in 4cyl mode have just a hint of roughness at 40-45mph, ever so slightly, and I can also hear the exhaust tone change when in that mode. The test would be to see if the Hemi shudders when you run with MDS off by using the Tow/Haul mode. Does that affect the shudder???
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  #33  
Old 01-24-2011, 10:54 PM
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Re: HEMI hestitated and "shook" during W.O.T.

In my experience the shudder is more a combination of lock-up torque converter timing into top gear crossing over with MDS activation.

Engaging Tow/Haul mode locks out top gear, so does of course in turn nagate any shudder.
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Old 02-09-2011, 06:07 PM
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Re: HEMI hestitated and "shook" during W.O.T.

Quote:
Originally Posted by THEPRFCT10 View Post
I will agree that whereas I may not neccessarily drive like this 100% of the time (i.e. 45mph, then mash W.O.T.), I was doing this on a regular basis per the manual and many suggestions on this forum to break in the motor (I have less than 300 miles still). The shuddering caught my attention and since it does not do it all the time, tells me something may be wrong (or maybe I'm just a little impatient if this really is the torque converter needing 6000 miles to break in properly!).
THEPRFCT10, did you have any luck with your dealer on this? My car is still doing this and I am just trying to figure out how to guide them to solving this problem when I have time to bring it in.
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Old 03-09-2011, 08:37 PM
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Re: HEMI hestitated and "shook" during W.O.T.

I was reading another thread about the shudder and on my way home from work I punched it at 40 and got the shudder, I never noticed it before and have gotten on it pretty hard. I punched it (pedal to the floor) at least 5 more times between 40 and 60 and got it to shudder each time. It almost feels like something to do with the power deleivery to the front wheels and the traction control more so than the torque converter or MDS. It feels like the traction control is pulsing power to the front wheels and cutting it off for the first couple seconds before it gives full power. I have the Hemi, my build date is 7/30. I do not notice any shutter when I am just cruising around and if I gradually get on it I do not notice it. Does anyone else feel it might be something with the transfer of power to the front wheels? It did this in Auto and Sport mode, I did not try the tow mode. I wish they would have made an option for 2wd only.
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Old 03-09-2011, 08:48 PM
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Re: HEMI hestitated and "shook" during W.O.T.

Mine does the exact same thing. How many miles are on your car?

I would take it in. Mine is scheduled to go in next week.

I am of the same mindset that it is something with the front axle. I am also thinking that it might be trying to get into 1st gear. I originally thought it was having trouble finding 2nd gear, but today at 40mph I tried it and it went into 1st gear VERY briefly. Maybe the programming is conflicted about what gear select? Some things I have learned...

1 - It seems to do it less the warmer the exterior temperature. 45F and up it gets better.
2 - It does it in Auto, Sport, and/or Tow Haul Mode
3 - Resetting the ETC does not help.
4 - It only does this between 40 and 50 mph.

I am hoping the dealer diagnoses tomorrow. I had colleagues with me on a business trip. We were on a two lane back road and I needed to pass a slow moving truck. The response of the Jeep was VERY embarassing. Both of my co-workers were shocked that a new car behaved that way.
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