a week ago I changed on my S80 V8 valve cover gaskets. A bit complicated but I was able to do it. When I was finished, connected VIDA (after very long time) and checked if everything is ok.
But live data wasn't good - especially STFT and LTFT. Vida shows from 85% to 115% on both banks.
I checked fuel pressure - it was OK. Also checked for any intake leaks, but nothing (btw. if I press accelerator and do higher revs (1500, 2000, 2500) there is almost no change. And absolutelly no change in way of lower fuel trims. Engine reacts when I open oil cap... So I think there won't be any intake leaks.
Idle rpm are normal - about 650-670.
Also tried some new MAF, but numbers are still the same.
Also checked exhaust manifolds, after front cats there are new gaskets, no leak there. But above I don't know (between cylinder and manifold). But I think, it would be possible to hear such leak so close to the cylinders... Engine is quiet.
What else to check? Any ideas?
Thanks for advice.