Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Hi, My name is***** will be glad to help. If the harness checks good with no opens or bare/shorted wiring then it is most likely injectors. all the symptoms you are having points to injectors, especially the smoke and raw fuel indicating the nozzles are leaking by. That is the first place I would go. However, you could still have some injector driver problems in the ECM so it wouldnt hurt to have it bench tested and reflashed with the most current software updates . Be sure you have good fuel supply pressure and are not sucking air from leaks or have any restrictions between the tank and pump. Let me know.