How to test troubleshoot Isuzu NPR diesel no start, hard start, won't start without starting fluid

Watch this to help troubleshoot your hard start or no start condition on your diesel engine.

My 2005 GMC W3500 (same as Isuzu npr) with the 5.2 Liter 4 cylinder turbo diesel engine wouldn't start without starting fluid, so I immediatly suspected a fuel problem.

After replacing the fuel filter and bleeding the fuel system multiple times, it still didn't fix the problem.

I came up with a test to test the fuel return, or pressure buildup, of each injector individually.

To perform the test, what you have to do is make a cap for the fuel supply line to the injector from the common rail. Next, cap each fuel supply line from the common rail one by one and attempt to start the engine. If it starts with one of the fuel lines to the injector capped, you know that that injector is allowing fuel to pass and not allowing enough fuel pressure to build in the common rail to start the engine.

My test showed that the injector on cylinder #4 was allowing the fuel to pass and not allow the pressure to build high enough to start it. To be on the safe side, I'm replacing all 4 injectors, but in reality, I could have got away with replacing just the 1 bad injector.

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Видео How to test troubleshoot Isuzu NPR diesel no start, hard start, won't start without starting fluid канала YoDoonie