Medium and Heavy Trucks
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Hi my name is***** will be glad to help. What is your engine serial number and are you getting any fault codes? This could be a mechanical failure like a rod, piston, push rod, rocker arm etc or most commonly if all those check out ok is a faulty injector or Jake brake problem. Is the check engine light coming on and if so what codes do you have?
Check the oil and filter for signs of metal/debris indicating a mechanical internal failure and if clean do an injector cutout test if misfiring to isolate a possible faulty injector or injector harness. Let me know
Were any of the exhaust ports wet with oil/fuel for any cylinders? Using a digital temp reader take temps for each exhaust port looking for a cold cylinder indicating a potential injector problem. Then using noid lights from an auto store check for strong injector voltage for potential injector driver issues in the ECM or injector harness problems. If that checks ok then using Cummins Insite you can do an injector cut out test or unplug each cylinder one at a time and listen for a change
A cylinder with little to no change is a problem cylinder
Once you have isolated a problem Cylinder, remove that valve cover if the harness checked good and inspect the rocker arms and wiring for damage to the injectors
Hi, Did you get this resolved or still need help?