Hi. I ma working on a 2012 Duramax with DEF problems. I need to flow test the Exhaust fuel injector and SI says to use injector tester J39021. I dont have one at my dealership. I was wondering if anybody could tell me how long it pulses the injector for. I'm suppose to get a quantity of 17-34 ml during an unspecified amount of time. I'm sure its several seconds at least but I can't find any specifics. I can use the tech2 to fire the injector I just need to know for how long. I need to run the test and have a specific amount to call GM TAC. Any info would be greatly appreciated. Jason

Jason Kari
Technician
Hersrud's of Belle Fourche
Belle Fourche, South Dakota, USA