It's a W211 E500 with 36000 miles on a 52-plate and so far it's been fine, fast, smooth and, excepting a duovalve problem previously discussed on this forum, reliable.
As of yesterday it judders, for want of a better description. This is sometimes accompanied by a low-frequency vibration. It feels like the transmission is stuttering, trying to interrupt the power from the engine, as if it's trying to change down but then decides not to. This occurs about 5 times a second, hence the juddering. Engine's turbine-smooth and the car still flies when kicked but gentle acceleration and just maintaining speed at light throttle openings produces this intermittent judder and vibration, whatever the speed.
I've disabled the ESP, raised&lowered the suspension and selected all the different damper settings to no avail. There is "no malfunction" in the dash display. My thoughts are that it's an electronic issue manifesting itself mechanically, but it's only a thought...and it's just out of warranty, too.
Any thoughts/help/advice would be most appreciated before I trouble the dealer...
As of yesterday it judders, for want of a better description. This is sometimes accompanied by a low-frequency vibration. It feels like the transmission is stuttering, trying to interrupt the power from the engine, as if it's trying to change down but then decides not to. This occurs about 5 times a second, hence the juddering. Engine's turbine-smooth and the car still flies when kicked but gentle acceleration and just maintaining speed at light throttle openings produces this intermittent judder and vibration, whatever the speed.
I've disabled the ESP, raised&lowered the suspension and selected all the different damper settings to no avail. There is "no malfunction" in the dash display. My thoughts are that it's an electronic issue manifesting itself mechanically, but it's only a thought...and it's just out of warranty, too.
Any thoughts/help/advice would be most appreciated before I trouble the dealer...