I got to work this morning and one of the formans had his truck in the shop and was complaining about no power and running rough so i threw my scanner on it and got an active code for injectors group 2 openand a stored code for turbo underboost, which i believe is a side effect of running on three cylinders. I started it up and hit the exhaust manifolds with my ir gun and the last three cylinders where running cold. I cycles the key a couple times and cleared the codes and it went away, truck ran fineon a test drive. We have another 07 with the same 5.9 that has this issue as well and it pops up every couple of months, cycle the key a couple times and it goes away. I had to put injectors in that truck and put in a new uvc harness at the same time and still persists. Anyone have any ideas? I'm much more familiar with navistar engines than the newer cummins so any advise is helpful, thank you.

 

Check the harness grounds and connections to the valve cover.

 

Could be a bad valve cover gasket, or a single injector. Since u scanned it and it didn't show a specific injector, it is probably in the gasket.

 

Well i pulled the valve cover and ohmed out the injectors, all 4ead between 0.7 and 0.8 ohms except for #4 which was 0.9 and 5 was 1.0, was not currently having the issue when I shut it off in the shop. ILl ohm out the gasket and check. Anyone got a gasket diagram for a 2 connector gasket?