[moldcad]

I promised to keep you updated on this, so here is the current status:

The jerkiness while backing off my garage immediately after cold starting the engine has disappeared as quickly and suddenly as it had appeared a couple of weeks ago. I went do my BMW dealer to diagnose the car for any hidden errors and they found nothing! Nevertheless, since my car was already on the bench, they updated the software to the latest version available - here is what I have now, according to the print-out they handed me over (someone please tell me what the three entries mean):

1. iLevel.iLevelBackuP: F020-15-03-502 (I guess it's the previous version?)
2. I-Level HO: F020-16-07-502 (I take it for the current version after programming)
3. I-Level Factory: F020-15-03-502 (as the numbers 15-03, which I take for March 2015, are the here and in item 1 above - I guess it's the software level/version my car had left the Factory with; indeed it's a March 2015 build)
4. New I-Level available: No

So I guess my current software is as per item 2 (F020-16-07-502), and there is no newer version available. I guess I need to download a newer version of Psdzdata for E-sys coding I have on my PC, as I can see the "15_03_502" suffix in the main series names (which corresponds to my Factory software version which has been over-written with "16-07-502" now...

Anyway - I must use the car for some more time to recognize the changes in engine behavior (if any) the new software introduce; my first impression is the slight and sporadic throttle response delays I've had before are now gone - but it's definitely too early to be positive about it.

As to my original problem this thread is about, I think - given there have been no error codes found, and it never happened again - the reasons could be one of the 2 following facts, or a combination of them:

- while normally using RON 98 fuel, there had been a single fill-up of RON 95 just before the jerkiness started (and my SA at BMW dealership said something about the controllers needing some time to adjust to RON changes)

- while normally I re-fill when the fuel gauge shows no less than 1/4th of the scale, for some reasons I re-filled with RON 98 only when my RON 95 fuel was almost gone (just a few liters remaining, and iDrive showing only some 50 km of range remaining.

All in all, the problem is gone - hopefully for good :-)

Piotr

PS. In spite of all the advise on allowing some 10 seconds or so for the rpm to stabilize right after the cold start, I keep engaging the gear and moving my car immediately (of course in an adequate way - i.e. not revving the engine before the rpm stabilizes). All is good again - no more jerkiness at all. BTW, all of you guys probably noticed that when still cold, the AT8 tranny will do its first upshift (1st to 2nd) at higher rpm than with the engine and gearbox at operating temperatures; therefore - in order to avoid high rpm with totally cold engine - my very first upshift I always do myself using the paddle...