Chosen Solution
I have hyundai 160D-7 with cummins QSB5.9-C thats runs idle rough in the morning , sometimes stops. After about one hour the forklift works fine . The next day, the same thing happens. Rarely, it works fine for the first time. we changed all the injector nozzles and the lift pump ,we clean the tank . we changed all the filters. the engine still runs idle rough in the morning . I would like to resolve this issue
Société Zitouna , Not familiar with the hyundai 160D-7. If fork lift has a diagnostics port use it to retrieve error code to help diagnose the problem. This is something you could try to isolate the problem, if you can unplug one injector at a time to see if miss can be isolated to one cylinder causing issue. Then you can diagnose that cylinder for compression, firing. fuel.etc.. just a thought! Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
Société Zitouna since it does run better after it warms up it is possible that you have an issue with the grid heater. I’d check and possibly replace the air temp sensor on the intake manifold as well as see if the ECM functions properly..
