Isuzu npr 5.2l diesel no start?

Answer 1

Well the 5.2L is a great engine and sense it's release in late 04 I've experienced little issues with starting problems. When i have they were related to internal supply pump damage, rear timing gear damage, out of fuel, in 08 I've had issues with the oil pressure sensor (ecu reference on passenger side engine block) wiring was not heat shielded correctly from exhaust manifold heat and would melt the wiring causing a short to power on the 5 volt reference which is also tied into the 5 volt reference of the Fuel pressure sensor causing the ecu to think common rail fuel pressure was 0psi and a no start situation, and if 3 or 4 (and sometimes 2) fuel injectors are not firing the engine will not start. As for cold starting aids like the glow plugs or glow plug controller not working is absolutely zero failures of those components my 10 years working on them. So that's basically what causes a no start on that model i'd start at these points. Hope this helps. Good luck.