I'm not trying to be funny here but if the scanner even if not locked out couldn't find a fault code what does the EML element record? My past history with modern cars has shown me that the MAF faults are the first to register even slightly out of normal function parameters even if still within range. Your car was clearly way outside of this and was this way from new yet Morgan were unable to find it. Even BHM clearly couldn't find a fault when scanning your EMS this time and I'd guess they had viewed live scanning as well..... if they can? I think that your history of your journey trying to solve this problem allowed BHM to finally follow an accelerated fault path of known issues with the Gdi and led them reasonably quickly to the MAF sensor, so well done Dave you had a very relevant part in this diagnosis too!

Now my engine is the original Duratec and I'm not locked out of the OBD2 port but what you can interrogate quite frankly is next to worthless so I guess I wouldn't have been able to have done any better than you on the Gdi. I'm sure I would have covered the same checks on the MAF system, mechanically and electrically as you did and struck it off the list of potential faults....... looks like we may need to hold a known master set of components in order to carry out our future checks. Lastly, I can't see why Morgan would lock access to the OBD2 port. Firstly its illegal, and I cannot believe that after all this time a bypass solution wouldn't have leaked out, BMW can't keep people from accessing their systems for very long yet the Gdi has been around for 12 years! If my plus 4 is anything to go by I think the OBD2 port has little to offer in the way of diagnosis. Still it has done one thing Dave......... I'm sure we will all look far more closely at the MAF in future and I'd probably group the throttle position sensor in that as well!