think you got the wrong end of the stick on this, when i bought my p38, 2 and a half years ago, number 4 injector sprung a big leak so i put in an ordinary injector after reading up a bit and the price of the injector with the sensor in it, and what i read said that the ecu would just default on the amount of fuel being injected, and thats exactly what it did, did not go into limp mode, did not have sluggish response, made no noticeable difference at all and drove perfect for 2 years, apart from an overheating problem, which used to come and go, but after two year came and did not go, so i took the head of and found a massive crack in it, so rather than **** about welding it and not knowing if it would be a success i had been offered a p38 with really nice alloys that cost £1500 for £500 so i went for it knowing that it had been in and out of numerous garages due to a none start problem, hence £500 quid, in tank pump was knackered, but fitted a temp inline pump to it while still in the doner car and got it running and then done the transplant and all was fine as i had fitted a new in tank pump in mine six months ago, all was fine the thing flew along as it was also chipped as well then started to get harder and harder to start, so changed the injector pump of my original engine on to doner engine and while i was at it done a manual test on the glow plugs of which all are ok, then bought the hot start bypass and fitted it and would go after two rounds of heater plugs, changed fuel filter lots coming through when you turn key on, and also fitted a non return valve between ijpump and filter, and put in new crank shaft sensor as well, then came back for a sarnie about a month ago and its been sat outside since, so as you can see im not totaly thick, i can change a front air bar in ten minutes back one about twenty, rebuild a compressor pump in about twenty mins, how about you???