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dowdy85 11-30-2010 06:39 PM

ECO Mode Engagement
I have a significant vibration when the ECO mode on the 5.7L when it engages. The passenger in my car today asked what the vibration and noise was while I was driving. The dealership told me that is the nature of the beast, I'm struggling to believe that is normal. Some people on this forum believe it is a normal thing, while others think it should be less significant. Any thoughts?

robpp 11-30-2010 06:46 PM

Re: ECO Mode Engagement
it is the mds, and yes it should be less significant.

dioes it happen only when the vehicle is cold or n omatter everytime?

dowdy85 11-30-2010 06:52 PM

Re: ECO Mode Engagement
It happens at all temperature, up hill, down hill, and on level ground. :-\

JoeSchmoe007 11-30-2010 06:56 PM

Re: ECO Mode Engagement
Did you see this post about front axle isolator replacement: ?

Also this (related to the same TSB):

dowdy85 11-30-2010 06:57 PM

Re: ECO Mode Engagement
Thanks, I already had front isolator replaced.

JoeSchmoe007 11-30-2010 07:06 PM

Re: ECO Mode Engagement
Do you experience this intermittently when changing speed or all the time while engine is in ECO mode?

dowdy85 11-30-2010 07:08 PM

Re: ECO Mode Engagement
I experience it every time it engages, it stays rougher while it is engaged and then disappears when I push on gas pedal.

KMDColo 11-30-2010 07:29 PM

Re: ECO Mode Engagement
On the WK1 people used to complain about a lugging sensation when driving between 35-45 MPH. The issue has something to do with the torque convert locking and unlocking to minimize the vibration of the MDS. I never had it on my Hemi, but many complained.

Dunecrawler 11-30-2010 07:59 PM

Re: ECO Mode Engagement
I had the same feeling with my '06 Overland. Also feel it with the new WK2, but less.
I had a Diablo Trinity programmer for the '06 and disabled MDS. That solved my problems. So maybe take it to a tuning shop and disable the MDS? You could always have it turned back on. I saw no significant change in fuel consumption with MDS disabled.

wk2overland 11-30-2010 08:23 PM

Re: ECO Mode Engagement
mds sucks. i drive with tow/haul on 24/7 so it doesn't go into 4cyl. difference in mileage? 1mpg at best. its such a gimmick. on flat highway cruise control at like 65 is where is would be great but cmon.

PMD G8 11-30-2010 09:34 PM

Re: ECO Mode Engagement
/\ Yeah I thought there was a way you could switch it off. I noticed when I drove a police package charger a couple of months ago I could tell when the MDS was going in and out. Definitely something that would take some getting used to. However I figured out that you could turn it off by hitting the button on the end of the shifter(forgot what it was labeled as), kinda like the tow/haul mode on the Jeep.

ryorde 11-30-2010 10:34 PM

Re: ECO Mode Engagement
My MDS is perfect. I dont know if it is saving any gas, but I cant tell when is comes on and off.

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