Ok , so air injection ruled out if we are sure there is no other exhaust leaks we can move on .
If fuel pressure correct to the spec , like airnassems says there drive it on the road with gauges taped to windscreen make sure fuel pressure stays constant no drop offs .
At idle the trim is pretty near 0 correction so engine side of butterfly must be pretty much sealed as air leaks show more at idle as the closed butterfly is keeping the vaccum up ....the Air is looking for a pathway out in this condition open the butterfly then you allow manifold vac to go more towards atmospheric pressure and air leaks don't show there face as readily .
Can you give me the kg/h or gramms per min that the air mass is reading at idle then at 2000 rpm .
Then drive car on the road and where you see the fueling trims going the biggest plus correction make a note of the rpm and what the air mass is reading at that time .
Pipe work from throttle butterfly to air mass good and sealed ?&
Pipe work to evap canister good no leaks ...if in dought blank off at manifold but leave fuel filler cap loose to allow tank to vent if your driving around .
Does vcds give injection milli second reading ?
You could try driving with air mass un plugged this should default it to a richer map at the lower throttle areas then see if your fuel trim values start to go more to 0 correction or minus readings .
Oil temp seems ok , I cannot see any radiator outlet temp on the engine diagrams .
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