Re: Poll: Aug 10 TSB for Shudder Working?
My deducing may be a bit "out there", but could the shudder problem be a simple mechanical issue with the MDS like the lifters are not shutting down the cylinders properly so they are not pressurized? If that happened would a code be thrown? If the MDS cylinders did not retain the combustion pressure when they were shut down, I would bet that going into 4cyl mode would cause a VERY noticeable shudder in that instance. If I'm not mistaken, this issue mostly arises when at light-throttle and lower speeds (under 50mph) so the engine would not be turning fast enough to somewhat mask this kind of MDS deficiency. By the same token, if the MDS was not fully off when full power was needed that too would cause some shuddering.
Now, noting that I'm tired at the moment, but could the MDS cylinder pressure issue I'm guessing at be affected by having the wrong oil installed??? Are people still having the issue after getting an oil change with the proper weight oil? Just thinking out loud. Mine does NOT shudder at all with or without MDS active, but I'd like to see the issue resolved for others.
An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.
2011 Jeep Grand Cherokee 4x4 Ltd
Silver, Hemi, 20" wheels, minimal doodads.