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m3 issue

infamxkris2010-08-29 21:22:17 +0000 #1
hey guys i had a 2010 335xi coupe automatic with msport and traded it in today for a 2009 m3 DCT coupe with 11k miles and my first impression was WOW! i didnt think it could get ALOT better than the 335... the difference was deffinitly there. It took some time getting used to the changes like popping it into neutral and using the e brake to park instead of just changing the gear to park. and one time i forgot to take off the e brake and i just drove off and it jerked hard a couple times and then i realized it was my ebrake so i released it and it was fine. another time i forgot my car was in manual mode and i just drove off and it revved real high and then i realized it was in manual and pushed the stick to the right again. But later on in the day i was driving and decided to put on m mode and it was impressive but after a little it started jerking hard like it had when i had the e brake on. So i checked to see if my brake was on but it wasnt. So then i put it back in normal mode (m mode off) and it was fine. I tried it one more time and same issue.... A little bit later on my way home i tried turning on m mode again to see if it would happen again but this time it was fine. Another problem i had was i tried using manual mode to see the shift lights and they never came on i put on m mode also.. do i need to do anything that would make them come on? my m mode settings has shift lights on. So what is my problem here? is there even a problem? is this a known issue? id like to thank everyone in advance and would like some peace of mind so i can start really enjoying my m3 with no worries.

Finnegan2010-08-29 21:34:18 +0000 #2
Jerking happened in which gear? Bet it was first and you were in "sport plus" in M mode. If it's first gear then you're modulating the throttle. Lots of threads on this. Basically you set up a feedback loop by slighty letting on/off the throttle under fairly heavy throttle. Easy to do and common.

I think there was a DCT software update (older version) that made the shift lights stop working. Search DCT shift lights see what you can dig up.
infamxkris2010-08-29 21:41:56 +0000 #3
so is the jerking normal? as in no problems with the car? what can i do differently so this wont happen? also i think it was in first gear i cant be 100 percent.

and also are you saying that the shift lights wont work anymore?
Finnegan2010-08-29 22:06:12 +0000 #4
Software update may be req'd for shift lights. Like I said, there was an older version that "broke" the shift lights.

Yes, jerking is "normal" in first if you modulate the throttle. Not good, but it's you not the car, it's "you". It's preventable with better technique. Here's a good explanation of what's probably causing the bucking/jerking.

holt2010-08-29 22:57:57 +0000 #5
I don't believe the shift lights start lighting up until you're past 6k rpm in manual shift mode? I don't recall the exact rpm range that the shift lights start coming on but I know it's up there in the higher range. Try running a few gears out to about 8k and see if you get some lights then
aajami2010-08-29 23:31:35 +0000 #6
Also, did you ever go to band camp?

I kid, I kid* Welcome!

*not really
mitch_e902010-08-29 22:19:40 +0000 #7
the jerking happens in first gear for the reason the others have explained.

as for the lights, they might simply be disabled. check in idrive to see if they have been disabled (I think it is in the M settings).
Dntlvet2010-08-30 00:21:28 +0000 #8
yep, lights most likely disabled. Mine were.



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