I have heard from a Euro 4 M3W owner that his was particularly difficult to start in the cold, with the added bonus of the headlights being on as soon as the ignition was turned on, a extra battery load. The standard Banner battery wasn't up to it and was replaced with a higher CCA (Exide AGM?) and the ECU re-programmed to give a richer mixture from cold. Starting much improved. As others have mentioned, pumping the accelerator isn't a good idea as it confuses the ECU.
Have you been able to compare the performance and running of his Euro 4 (when it can start) with the Euro 3?
