Hi Martin,
i had a major do with one of these end of last year, and learnt a lot from it, which is good because i didnt get paid for all the hours i put in, but my scope skills and diagnostic approach took another step forward from it.Cam sensor, mine would not run with a non genuine sensor, the signal was a1, just not in the correct place/time and mis-phased the ecm , they will run with cam sensor unplugged,as it will double fire the coil pack. The one i did came in very hard to start in cold weather, and would wet the plugs, but would start ok after a 2 hour warm in the workshop and start a1 for the rest of the day. To cut a long story there was no cam signal when cold,(cam sensor faulty) which meant the ecm stayed in its crank map, which meant its injection pulses stayed at 29 ms which meant wet plugs and no start, if we did manage to get it running cam sensor came good after 20 secs running. I'm wondering if this is the cause of your customers thermal incident. HTH Paul
BTW i would have openly laughed at him