Hi Martin,

Thank-you for the information. I should have that tool but it isn't in our tool room and no one knows the last time it was around. I am working on a 2012 Silverado but I'm testing the Exhaust diesel fuel injector as per Doc# 2890789. Which only says to use J39021 tester and only gives flow results but no time frame. I assume that tester has a set pulse time for its inj. test but I can't find anywhere what that time is.

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