SL/R230: SL600 722.6 Transmission Lurch / Jerk
06-04-2010, 08:27 AM
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SL600, CLS55, ML430
SL600 722.6 Transmission Lurch / Jerk
Hello,
I wanted to get some insight on this issue that I am having. There is a jerk / lurch just after leaving a stop, but before shifting into second gear. It occurs just around 10 - 15 mph. If you accelerate very slowly, then this is very prominent, as the vehicle oscillates after the jerk, which almost seems as if a manual clutch was slipped off start and then once moving dumped while on the gas.
I am guessing that this has to do with the torque converter clutch locking up too early. This is definitely not related to the 1st-2nd shift. There is also a feeling of slight lag off the line.
I do know that the stator in the torque converter should not freewheel both directions, which could cause the off the line lag. Could this also cause the lurch or is this definitely lockup.
Also, when coming to a stop, I notice that the car feels like a manual with the clutch engaged. At a stop, the car does not stall, so it is unlocking.
Thanks,
Greg
I wanted to get some insight on this issue that I am having. There is a jerk / lurch just after leaving a stop, but before shifting into second gear. It occurs just around 10 - 15 mph. If you accelerate very slowly, then this is very prominent, as the vehicle oscillates after the jerk, which almost seems as if a manual clutch was slipped off start and then once moving dumped while on the gas.
I am guessing that this has to do with the torque converter clutch locking up too early. This is definitely not related to the 1st-2nd shift. There is also a feeling of slight lag off the line.
I do know that the stator in the torque converter should not freewheel both directions, which could cause the off the line lag. Could this also cause the lurch or is this definitely lockup.
Also, when coming to a stop, I notice that the car feels like a manual with the clutch engaged. At a stop, the car does not stall, so it is unlocking.
Thanks,
Greg
06-04-2010, 09:34 AM
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98 Brilliant Silver E320 Wagon
Have the dealer pull the TCU DTC codes and check adaptation values. If you have the dipstick tool check the fluid level but that's almost never the issue. 722.6xx = expensive repairs so don't ignore.
06-04-2010, 09:21 PM
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98 Brilliant Silver E320 Wagon
Not sure what you mean by DAS? If you mean you have an OBD II Scanner then that only reads generic DTC for the emission control systems.
What is needed is the SDS or Starmark Diagnostic System which all dealers have. A few independent MB mechanics also have it but they are few and far in between. Only the SDS can read the codes on the Transmission Control Unit. But what is more important they have the expertise to interpret the codes.
What is needed is the SDS or Starmark Diagnostic System which all dealers have. A few independent MB mechanics also have it but they are few and far in between. Only the SDS can read the codes on the Transmission Control Unit. But what is more important they have the expertise to interpret the codes.
