I changed out the electrical connector with the 2 "O" rings on my transmission because of a leak and the leak has stopped. The trans shifts smoothly under light acceleration but upshifts hard under heavier acceleration. I put a OBDII code reader on the car and no codes came up. I have read that replacing the valve spring in the trans corrects slippage between gears but I'm wondering if it also fixes the hard upshifts? Since there were no codes; I figured it probably isnt the electrical control plate under the valve body. Any suggestions?
Thanks
John

__________________
1985 300TDT
2013 E350 Bluetec

The 722.6 trans computer will adapt to your style of driving.

With a MB scanner you can erase the adaption & then readapt the trans.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thanks mbdoc.....can I just do the adaptive reset procedure with the key/gas pedal routine or do I actually have to have MB reset it?
John

__________________
1985 300TDT
2013 E350 Bluetec

AFTER erasing the adaptation with scanner....

You must drive car, always keeping the engine RPM below 1800 & allow the trans to shift from 1st to 2nd to 3rd to 4th & to 5th, and then coast back to stop.

Do that same procedure 4 times & then let idle for 10 minutes in P or N.

NEVER allow the engine RPM to exceed 1800, if it does you must shut off the engine & restart the process.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator