Simon I didn't think you were being funny.... I completely get that there is no point in you working your magic if there is something inherently wrong with the engine and I'd rather have that side of it right for when you see the car
I'm struggling with the electronics side of this.... The last petrol car I had was an 83 Renault 11 turbo and that had literally no engine management at all since then I've had diesel and if something was wrong the code reader told me what to change
The code reader I'm using is an autel mot pro that has a BMW specific program.... I'm wondering if I put it onto obd scan and read it if I'll get the open closed question answered
Fuel trims.... On petrol they're all pretty close on lpg cyl 6 is out
Manifold... I wish I'd taken pics last time it was off but if I need to I'll pull it off again at the weekend (easy job compared to the diagnostics)
If memory serves me correctly the internal pipes have little plastic caps on the end of them (they tend to drop out when putting the manifold back) if I'm remembering correctly then the lpg nozzles are close to the actual fuel injectors and not touching these secondary air pipes.... The nozzles are brass ones that have been drilled and tapped into the manifold... Looking at their location I can't see how they could have been put in without removing the manifold and injection rail
If needs be I'll pull the manifold off this weekend and photograph the nozzles and add them to the Dropbox folder I shared earlier
You should find some sort of section called i/m readiness - or something similar. This should show your open/closed loop status in a simple to understand way.