[oldgms]

Can someone tell me how i can limit my fuel consumption at an idle through calterm? The 870 uses almost twice as much fuel idling or just off idle using my crane and or air compressor than it uses driving say 80 miles down the interstate at 70 MPH. It's getting to be a pain stopping around every job site to fuel up to make it home but if i don't let it idle i can what seems drive forever on a load of fuel. Last week i had to use both crane and compressor for a little over two hrs and boom half tank of fuel gone. Also it's been like this forever but even at light throttle shifting through the gears it bellows pretty good black smoke other than that the thing runs great.

[IceXN]

may have a bad injector or 2,

[oldgms]

Injectors passed every test including bubble test

[MaraJin]

Monitoring some live data to put light on the situation would help...

   

[zyNoT]

Could be injectors, timing and fueling actuators, turbo sticking, EGR sticking (if emissions still on), engine running in the wrong mode at the wrong time, etc etc.

CM870's are notorious for injectors going bad and timing and fueling actuators wearing out. Since they have an air-driven turbo actuator, if you have a simple air leak in valve box or lines it can cause turbo to stick in the wrong positions.