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  #145  
Old 02-02-2011, 12:21 AM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

Had the torque converter replaced. So far, so good but I'll need to give it a week or so.
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  #146  
Old 02-02-2011, 05:56 AM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

My wife's '07 Honda odyssey had the same issue a year ago. Honda had a "software update" that was suppose to resolve it. It didn't. Honda ended up replacing the torque converter and the problem went away. Her issues were during slight acceleration around 45mph.

Different vehicle, different engine, different tranny.... Same symptoms and same fix.
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  #147  
Old 02-02-2011, 05:37 PM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

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Originally Posted by dicephalous View Post
Had the torque converter replaced. So far, so good but I'll need to give it a week or so.
Awesome!
Looks like Chrysler might need to stock up on those....
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  #148  
Old 02-02-2011, 07:26 PM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

so I thought I would give it a week....nope. Shudder is back with a new very annoying sound during acceleration. Jeep goes back Friday.
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  #149  
Old 02-11-2011, 06:05 AM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

Does anyone know if there is a specific build date set that is affected by the shudder or is it just a random number of all wk2s out there experiencing the problem ? Sory if this was already stated.
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  #150  
Old 02-11-2011, 10:09 AM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

I have a suspicion that all Jeeps can be made to shudder. For me, it is very specific sequence of events to make it happen.

Go 40 mph, flat road (slight hill will make it worse), allows the Torque Converter to lock up (you should feel it or see the rpms drop to around or below 1500rpm), ECO mode should be lit at this point. Give a little gas and you should feel the vehicle load up, if the ECO mode goes out, let off, try it again, get it to where right before the ECO mode is going to turn off. Once you find this point, gouge the throttle, this is where I feel mine. If you go slower than 40 you will drop an extra gear and it won't do it. The faster you go, the less shudder I have experienced.

The worst was going up hill (slightly more load) and all of the above parameters were met.

If you are going down hill I have not been able to replicate it.
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  #151  
Old 02-11-2011, 10:58 AM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

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Originally Posted by mrpositraction View Post
Go 40 mph, flat road (slight hill will make it worse), allows the Torque Converter to lock up (you should feel it or see the rpms drop to around or below 1500rpm), ECO mode should be lit at this point. Give a little gas and you should feel the vehicle load up, if the ECO mode goes out, let off, try it again, get it to where right before the ECO mode is going to turn off. Once you find this point, gouge the throttle, this is where I feel mine. If you go slower than 40 you will drop an extra gear and it won't do it. The faster you go, the less shudder I have experienced.
This is the exact sequence of events that I need to do to have it happen on my GC. It started at about 1500 miles.

I still need to take it in.
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  #152  
Old 02-11-2011, 03:54 PM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

Quote:
Originally Posted by mrpositraction View Post
I have a suspicion that all Jeeps can be made to shudder. For me, it is very specific sequence of events to make it happen.

Go 40 mph, flat road (slight hill will make it worse), allows the Torque Converter to lock up (you should feel it or see the rpms drop to around or below 1500rpm), ECO mode should be lit at this point. Give a little gas and you should feel the vehicle load up, if the ECO mode goes out, let off, try it again, get it to where right before the ECO mode is going to turn off. Once you find this point, gouge the throttle, this is where I feel mine. If you go slower than 40 you will drop an extra gear and it won't do it. The faster you go, the less shudder I have experienced.

The worst was going up hill (slightly more load) and all of the above parameters were met.

If you are going down hill I have not been able to replicate it.
Only have about 40 miles on ours so far (just picked it up last night), but I think I just did this without trying. As I got on the gas, there was a pronounced shudder for a fraction of a second. I looked at the speedo and it was just over 40mph. Couldn't readily reproduce before I got home, but I guess I'll try again. Not really looking for trouble, but it was a bit concerning feeling when it happened.
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  #153  
Old 02-11-2011, 04:10 PM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

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Originally Posted by VermontHobbit View Post
Only have about 40 miles on ours so far (just picked it up last night), but I think I just did this without trying. As I got on the gas, there was a pronounced shudder for a fraction of a second. I looked at the speedo and it was just over 40mph. Couldn't readily reproduce before I got home, but I guess I'll try again. Not really looking for trouble, but it was a bit concerning feeling when it happened.
I'm not trying to dismiss the concern or give Jeep a bye on this but when you consider that @ 40mph under light load you have the engine in MDS mode and the torque converter in locking mode it's not surprising things get a but rough as all the pieces sort things out. The engine has to go into 8 cylinder mode while at the same time the transmission is unlocking the converter and starting a downshift which causes the engine to go into torque reduction to protect the trans. This all happens in a few fractions of a second then sorts itself out and off you go.

I really think there are multiple things going on here that the Internet is lopping into one symptom. What vermont described above is almost what I would consider expected behaviour while what dicephalous has is more of a mechanical failure of the TC.

One thing to check, does the problem go away completely if you run in tow/haul mode? If it does then I thing that precludes it being a hardware failure and makes it something I would think they could correct via software. Since this has been reported for years with this engine / trans combo I think they have probably optimized the software as much as they can while still retaining the MDS and ECO settings they need to CAFE MPG numbers while reducing the impact on driveability. Since there also seems to be an updated TC out there perhaps the complete fix is a combination of this new TC and some updated software?

Just thinking out loud, don't shoot the messenger.
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  #154  
Old 02-11-2011, 09:55 PM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

Sorry if I missed it, but does this shudder only occur with the V-8?
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  #155  
Old 02-12-2011, 10:35 AM
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Post Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

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Originally Posted by mjw930 View Post
I'm not trying to dismiss the concern or give Jeep a bye on this but when you consider that @ 40mph under light load you have the engine in MDS mode and the torque converter in locking mode it's not surprising things get a but rough as all the pieces sort things out. The engine has to go into 8 cylinder mode while at the same time the transmission is unlocking the converter and starting a downshift which causes the engine to go into torque reduction to protect the trans. This all happens in a few fractions of a second then sorts itself out and off you go.

I really think there are multiple things going on here that the Internet is lopping into one symptom. What vermont described above is almost what I would consider expected behaviour while what dicephalous has is more of a mechanical failure of the TC.

One thing to check, does the problem go away completely if you run in tow/haul mode? If it does then I thing that precludes it being a hardware failure and makes it something I would think they could correct via software. Since this has been reported for years with this engine / trans combo I think they have probably optimized the software as much as they can while still retaining the MDS and ECO settings they need to CAFE MPG numbers while reducing the impact on driveability. Since there also seems to be an updated TC out there perhaps the complete fix is a combination of this new TC and some updated software?

Just thinking out loud, don't shoot the messenger.
My car behaves exactly like dicephalous and mrpositraction. I also have noticed more shudder and vibration just before overdrive in what I think is 4th gear at 32mph to maybe 40mph. I have tried driving the car in Tow / Haul mode to see downshift problem goes away. It does not. You have to wait a while for it to get into top gear then get your speed down to about 45 mph. It still shakes and skips after the downshift for about 1-2 seconds.

I am still hopeful they resolve this. Seems more mechanical than programming related.

Also I just want to point out that Honda and GM both have engine cylinder deactivation. I have never heard of a problem between the Eco mode and full throttle. They are all designed to re-activate to full throttle on all cylinders in less than half a second. It would be unsafe in an emergency maneuver for it to do otherwise (as it is now). I would think that would be one of the first things they perfect. Because if I were a program manager and it was found that the re-activation could not engineered to be quick and seamless that would be a showstopper.
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  #156  
Old 02-12-2011, 10:38 AM
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Re: Did Shudder TSB fix a problem? 2011 Shudder problems thread

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Originally Posted by litespeedz View Post
My car behaves exactly like dicephalous and mrpositraction. I also have noticed more shudder and vibration just before overdrive in what I think is 4th gear at 32mph to maybe 40mph. I have tried driving the car in Tow / Haul mode to see downshift problem goes away. It does not. You have to wait a while for it to get into top gear then get your speed down to about 45 mph. It still shakes and skips after the downshift for about 1-2 seconds.

I am still hopeful they resolve this. Seems more mechanical than programming related.

Also I just want to point out that Honda and GM both have engine cylinder deactivation. I have never heard of a problem between the Eco mode and full throttle. They are all designed to re-activate to full throttle on all cylinders in less than half a second. It would be unsafe in an emergency maneuver for it to do otherwise (as it is now). I would think that would be one of the first things they perfect because if I were a program manager that would be a showstopper.
I don't think it's a problem reactivating the cylinders, that seems to be very smooth as long as you aren't also asking the torque converter to unlock and the trans to downshift. On my Cayenne turbo they programmed in a lag that allowed the TC to unlock and the trans to downshift before the engine would apply full power (500HP BTW). It was noticeable and caused a lot of uproar on the internet but Porsche's position was, "that's by design". I'm just saying that I don't think everyone reporting a problem is reporting the same problem.
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