I have a strange problem for ~two years now, not seems to be related to firmware version or the ECU itself.
I have a well adjusted smooth idle when starting the car and getting to working temperature.
This is the case when I'm doing short trips (like a few minutes) also.
But when I'm doing a long trip, like an hour on the highway, my idle getting ~10% leaner and stays that way for a while.
If I let the car cool for a few hours, my idle lambda goes back to normal again (still with the same temperatures).
I'm really curious about your opinion as I couldn't spot any difference in logged values other than lambda.
Here is a fresh log with 1.1.80:
http://quasar.dynaweb.hu/~lezsi/vems/v3.3_n002211-2010.07.31-16.25.24.vemslogAt around 1:00 I was in the city, idle lambda around 0.94
At the end of the log at 65:20 I get lambda values of 1.0-1.04
(EGO correction is off at idle)
I had no problem with ignition either case, the engine accepts both mixture, but I need to adjust it rich, to stay in a reasonable band when it gets lean after.
Engine is BMW M30 turbo, 60-2 primary trigger + Hall cam sync now (no cam sync before), 6x870cc siemens HighZ injectors now (1200cc lowZ before), Bosch 3x2 wasted spark.
I had the same effect with firmwares 1.1.26, 1.1.56, 1.1.78.
Tried more than two ECU boxes also.