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Old 01-08-2013, 10:45 AM   #11
OEM ///Member
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,857
My Ride: 330CiC, M5, X5, E93
Originally Posted by trizzuth View Post
Transmission is acting strange, jerking while in gear randomly, once recently, it lunged a little forward while I was stopped with my foot on the brake. Scare. Not sure if it is torque converter or not.
Remember on the automatic cars, there is again another thermostat just for the automatic transmission in addition to the engine thermostat. The transmission thermostat fits in the bottom of the expansion tank somehow as I recall? This may be???? due to the fact the DME can change the engine coolant temp and BMW wanted to stabilize the automatic trans temps a bit more??? Again, some of these cold engagement and cold slipping issues with the automatic transmission may be helped a properly working engine and transmission thermostat. At least the transmission fluid would come up to temperature much quicker if the engine warmed up at the proper rate.

I know the newest Torque Pro app supports automatic trans temp display in some cars, it works in my daughters VW with the 6 speed Tiptronic, however, i am not sure the PID for the trans temp in the BMW has been flagged in Torque yet??

Just some more things to ponder??
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Last edited by jfoj; 01-08-2013 at 10:48 AM.
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