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Hello all so I have a 2000 excursion limited with the good Ole 7.3 250k miles yesterday truck just died on ne and will not start has codes p0380 p1262 p1278 replaced uvch and swapped in a known good idm fired right up passed buzz test etc drove down road and died again same thing now have codes p0380 p1262 p1278 p1298 p1293 p1294 p1296 not sure where else to start idms are not cheap lol uvch has been replaced with pigtails now crank no start
Seeing that many codes I would check your engine harness very carefully, especially at the drivers side valve cover where it seems to chafe on the valve cover. It may be more beneficial in the long run just to order a new engine harness since it comes with new UVCH connections, I never splice in new connectors there. Pull your valve covers and make sure none of the wiring that is supposed to be zip tied out of the way is pinched under the valve cover or cracking. If I had to guess the problem is somewhere right there on top of the engine.