Hello everyone I NEED SOME HELP.

[Smooth]

From Reading the previous , The next step would be checking each injector for leaking Cups.

There may be an easier way to do this if there is I do not know of it.

Cummins Quickserve - Go to Troubleshooting of 559

You would need Set of Injector Block-Offs
You are also going to need certain test fitting from Cummins.
Maybe you can borrow these items if not they do add up to a bit of $$$ but worth the money if you can perform these tests yourself in comparison to what a dealership that may of may not do things properly will charge you.



Quickserve will give you step by step of the process.

Leak Isolation Test.

But There are many tests involving Code 559 and it can be a bit overwhelming and time consuming.

But seems you have already made the most commons moves and yet to find your problem. I would suggest Quickserve and starting at the beginning of 559 Troubleshooting.

Unfortunately w 559 There is rarely a fast easy solution. 1 of many reasons why I prefer and CM871