mine does it at all temps but not all the time it seems. Got me going crazy. Been running Power service, any other additives anyone would suggest.

 

Ok so its obvious that we both need help from people who work on these truck everday, looking for advice from a sponsor maybe

 

i dont work on them every day but from time to time i'll accept a cummins job. my best way to try to help is to ask when did it start?

 

When I got my custom tunes from diablo sport

 

Mine has developed a rattle also. I just changed the oil, adjusted the valves, and added a oil bypass filter. The rattle seemed to get lot louder and worse. I can't narrow it down. Afraid my injector/s are going south. I don't know what else to check. Can u get the injectors checked?

 

you can get them checked. but like i said in my previous post on here. i have got brand new injectors and mine is still doing it

 

mine started a while ago, maybe 4000mi ago. I don't drive my truck all the time just when I need to haul something or on the weekends. good power no fuel int he oil and no blow, just a knock rattle that makes me crazy

 

that is a problem. that is actually exactly what i was thinking. those of you with tunes can ya'll run a stock program?

 

yeah, I will try that, but I have my smarty on a low setting one stage above stock. Will try the stock setting

 

Check the injector hold down clamps and make sure thy are tight, especially #4. Injector rattle just seems to get worse with age. Likely it is the spray pattern chaning over time that is causing it.

FYI, just because one has new injectors does not mean they won't rattle. Depending on how the injectors are balanced and setup it may still rattle, custom tips or stock.