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mikkhh

First of all, this machine is nearly 30 years old? Does your income depend on it or is it jut a farm truck? What other troubles it has? Is it worth to fix it properly? How is the frame rust wise? How is the electrical wiring (if there have been oil leaks then there is dirt attracted and it will rub through wires eventually due to all of those vibrations) Also there is even no need for oil leaks, wiring harnesses can rub through with dirt only since this thing is nearly 30 years old.

If it is indeed ECM then only proper option is to buy brand new (or cummins reman) from official dealer and HAVE them reflash the ecm with proper data to your truck. If the ECM is really expensive then it may make more financial sense to buy newer truck that will cost you less money in the long run! If it is indeed a farm truck and having it INoperable for weeks or months is not a problem you can gamble with used ecm is if they are cheap...

If you can do all the work and can get parts for reasonable price (or have parts truck) AND it your income does not depend on it AND you do not count time spent fixing as an expense then yes those things can be fixed and keep running. But if you have to take it to somebody to have those things done than those old trucks are financially totalled. But for some reason that old equipment can fetch quite big dollar since there is like a cult following of people who are afraid of modern, more reliable and more efficient equipment.