To establish if your ECU is standard or remapped, go into 'Advanced ID' in the engine module. 'Successful' and 'Attempted' flash counts will both be 0 if it's standard. 1 or more means it's been remapped.
I would log this lot first:-
Engine speed
Mass Air flow
Lambda control - that's your short term live adjustments, +/- 25%. Anything more than 10% either way isn't too healthy.
Lambda requested.
Lambda actual - Just to make sure it's running 1 at idle and part throttle, and ~ 0.85 in boost. Black smoke zone is 0.75 and richer.
Boost requested
Boost actual
Fuel rail pressure requested
Fuel rail pressure actual
Fuel rail pressure difference - easier than getting the calculator out! 5 bar difference over a 100rpm or so is normal. Analog devices take time to react.
Ignition angle - Don't be surprised to see this go negative in boost, it's normal. Such a massively delayed burn can also cause black smoke.
Throttle valve angle.
Annoying that you can only log 12 things at once, but must be a limitation of the databus rather than VCDS.
Then log these separately:-
Engine rpm
Boost requested
Boost actual
Ignition delay (knock control) cyl 1
Ignition delay cyl 2
Ignition delay cyl 3
Ignition delay cyl 4
Misfire recognition cyl 1
Misfire recognition cyl 2
Misfire recognition cyl 3
Misfire recognition cyl 4
Intake temp
RE: the fault codes, the only one I'd be concerned about is the MAF. The post cat lambda and charcoal can plumbing faults are common and wouldn't cause excessive over fuelling. A bad MAF certainly could though.
