Hello, I'm hoping to get a little help from some Deere folks. I've got a 2008 850j dozer with a 9.0L. I have a reoccurring ecu code, 656.7, Cylinder 6 injector low fuel flow. It's always the same code so I don't think the computer is lying to me. The DTC is very specific and indicates that either the injector or the fuel restrictor is malfunctioning. I pulled #6 injector and had it tested. It failed in spectacular fashion. I then installed a new injector (reman) as well as a new feed tube and new fuel restrictor valve. Installed and torqued everything to spec. I still get the same DTC. I ohmed out all the injectors and all the injector leads--they all have the same values. Anyways, I think the ecu would recognize a circuit/signal issue and would supply a different DTC if I had circuit issues. I can run the machine at full throttle, no load without triggering the code ( I travelled for 30 minutes with no working load without issue), but as soon as I put it under heavy loading the code pops up. I've gone back an put a little more torque on the injector clamp and feed tube nut. Still have the code show up. I never did have the reman'd injector calibrated, but I find it hard to believe that programming injector fuel trim is causing my issue, but I could be wrong as I'm certainly not a trained pro at this.
I don't believe fuel pumps, or supply is the issue otherwise I think I would expect to seem more random and varied codes, i.e. cylinder 2, cylinder X, low rail pressure, etc... It's alway cylinder 6 low fuel flow!
My thinking is either the new (reman) injector is faulty or could I have an ecu issue?
Thanks for reading.
I don't believe fuel pumps, or supply is the issue otherwise I think I would expect to seem more random and varied codes, i.e. cylinder 2, cylinder X, low rail pressure, etc... It's alway cylinder 6 low fuel flow!
My thinking is either the new (reman) injector is faulty or could I have an ecu issue?
Thanks for reading.