sussexa said:

possibility of air leak after maf from split turbo inlet pipe or common broken vapour trap under airbox, letting unmetered air in that bypasses maf giving low reading

Click to expand...

Checked today, you are 100% right. oil catch box underneath air box is snapped off and sitting on the undertray.

is the vapour tank still fitted to the breather pipe though?
if the tank is still air tight no cracks or holes it will just need fixing up with cable ties or something so it doesn't drop down and smash at a later time.
if its holed or cracked you can utilise a container that fits the pipe for now, I put some measurements up of the hose somewhere ill have a look.
here it was
https://www.fiatforum.com/stilo/336871-phillipb82-intermittent-warning-light-flat-spots-2.html

Vapour tank is still attached to the breather pipe but there is big hole on the top. Just reading through the thread you posted, will check the pipe for splits or cracks and get it fixed with plastic bottle over the weekend.

Fixed oil trap with plastic bottle and smoke is gone even under hard acceleration. Thank you for help

do you mind doing another log again same as your last few and we can use this as a referance as this issue does crop uop alot on here with the vapour trap broke or holed.
we can see how much maf values drop as a direct result, or more how much they have now increased.
i will put all data into a graph or table to see approx max reduction in mg/i, or even % vnt difference or fuel increase.

I will when ill get my car from the garage, one of the injectors decided to die on me and getting it diagnosed/fixed/replaced

Local garage didn't do well at all. Been offered 4 2nd hand injectors because one of mines was seized and rest were leaking. After the job done has to go back to the garage 3 times already because of diesel leak. Now leak is finally fixed but they snapped one of injector studs and fit standard bolt in there and there is still blow by which can be heard when on load / accelerating. I'm getting really pissed off with their quality of service.

jeez it sounds in worse state than when it went in, feel for you as you would of thought you'd done the right thing leaving the important bits to the pros.
probably not fitted new copper washers each time they went back in, possibly tightened one end of fuel pipes before nipping other end and then tried to make it tight, and then over torquing hold down nuts as no new washers and still leaking.
are they specialist or just local garage?

Just a local garage. Well, they claiming they're specialists. Its worse than it was before I took it in and I regret I didn't try to do it myself. I'll be their worst nightmare till they get it sorted proper way