No chance to do any work on this yet, but I did notice something on the way home.
Only in certain circumstances do I see a PWM of 980, and it then instantly drops down to something around say 660-710. It'll then bounce around a bit and move upwards as the engine speed gets to 4000 rpm.
Idle the value is 20, and light throttle to maintain speed at 55mph is about 120.
I also spotted the Mair tracks Mreq at demands up to about 750, after than Mair lags.
It seems as though the demand to increase airflow by allowing boost is being given, but then something is pulling it back.
I have already done another map to make ECMStat available so I can see what limit is in operation, but I have not had the opportunity to upload it yet.
If there was a leak from the intercooler, then would the MAF record the increased airflow, but then the leak would cause lower airmass in the intake and the MAP sensor would correct the fuel quantity delivered, or would it just run rich.