Have done complete major service and repair to cylinder head valves . Problem persists in once setting the diesel pump the motor runs 100 percent, then goes back to limp mode . Reset the pump again , runs for a while , then back to limp mode . Any suggestions. ??
You just mentioned you had some head work done. You may have to check your EGT (exhaust gas temp) it may be too high.
Sometimes an injector can drip instead of spray and it can cause the EGT to be above the threshold temp programmed into the computer. You would need to remove the injector from the engine to visually see the spray pattern. Too much fuel will raise the EGT so also check the fuel delivery system for proper operation.
Also check the injector pump timing, if the timing is too advance it can raise the EGT causing the computer to put the engine into limp mode.
There are other things that can cause the limp mode but I would check this out first.
I would need to know if you have chipped the computer?
There is information out there that the power chip can cause this.
Try this suggestion and let me know how you made out.
Thank You so much . I am sure this should resolve the issue . If not will refer back to you . Much Appreciated .