Hi, My name is XXXXX XXXXX I can help. We will start with your codes first.
ecu1076.01 this is an injection pump control valve closure to short
bif168.18 system voltage to low at 1500 rpm
bif167.18 this is low voltage on your alt.
bif167.17 this is a low voltage at alt also
The code we need to look at is the ecu code. There is a dtac soultion for tractors that use a stanadyne de10 injection pump. This solution will require your local dealer hooking into you tractor and checking the valve closure of your injection pump.
the solution number is XXXXX
They will be checking the injection pump with this code. I have replaced a few of these pumps with this code. The symptoms were like yours , sometimes it would miss sometimes it would not.
There is also a problem with the wiring on these tractors from the injection pump to the ecu. We have had to replace these wires, dtac says they are not heavy enough to carry the load. They may need to open a case on your tractor to view the solution.
I talked to dtac a few months back on a 6320 problem like yours. There are a few items they want changed and they also want a report back on these cases.
as far as the bif codes they will only set a code if your engine is above 1500 rpms and system voltage is 12 or below. This could be an alt. problem since you have 5 counts on the code.
Also I have had to drain the fuel tank on one or two machines to remove the water that was in the tank. The de10 pump doesn't like water so if you end up having your pump changed I would also mention having your tank cleaned. I replaced this pump on one customer twice. He had a problem with his supply tank.
I hope this helps