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Hi my name is ***** ***** am here to assist you Today does the engine warning light stay on see image.
More of a mechanical issue then have the injectors been tested.
How did they get tested.
Did the injectors get sent away for testing or just a leak off test.
They need to be sent away and bench tested properly.
With Delphi common rail you just need to look at it and it fails.
I use http://www.merlindiesel.com for testing if that helps.
Done it since i was 15 and i am 42 now if that's the question.
Yes a sticking injector that starts working when the engine gets worm normally due to carbon.
The injector is 50% electronic and 50% mechanical so if the mechanical part fails the ECU / module can not detect it if that makes sense.
Their are other companies that test injectors i just used the merlin link as an example as they are just round the corner from me.