Hmm, the things is that there's no significant oil loss (still at the same level for a few weeks now). The oil dip-stick is at it's place and there's no significant blow-by under the valve cover/oil pan.
We did the LPG tune-up and now it's running on LPG also. The engine pulls fine and idles good but sometimes it gets some kind of hiccups at idle after a high-speed drive/high revving. There could be also a
vacuum problem since it's getting too much air - we had the air intake partially covered with duct tape and the engine ran better that way?!
Maybe the loss of compression is due to some valve sticking when hot or other cylinder-head problems... will scan again for sensor values and get a log for comparison.
I have added two OBD logs:
- one with a cold engine
https://docs.google.com/open?id=0B_X...3pCZDRoblZrc0k
- one with engine at operating temperature
https://docs.google.com/open?id=0B_X...EprTFRmbTlmTkU