Rough idle on warm start.

[ainarssems]

I have imported logs in excel and made graphs in the attached file. Click through the sheets to see graphs.

Looks that lambda 1 stops working after the while or gets very lean on that bank.

Bank 2 is running very rich at start, could be that because of blocked exhaust that side is not breathing properly and getting less air in cylinders and because of that bank 1 is getting more then half of the airflow which could result in lean and therefore lambda stops responding in that side.

You need to sort out exhaust first then do another log. Or drop exhaust and do the log without exhaust if you don't feel like spending money before definitely identifying faults.