cm2250 -cm871

[Waterloo]

Please post the make, model and year of the trucks, along with mileage, axle gearing and transmission, along with application.

I sent you an email that should help you in regards to Insite and the Inline reader, along with some other stuff.

If you do not have a Cummins Quickserve account, you need to go to Cummins Quickserve and sign both of your motors up with the Engine Identification Number. Your 871, call the dealer and get the EIN from the original motor. The Quickserve account is free, and gives you access to everything you need to work on these motors, from parts to procedures and diagnostics. Here is the link: https://quickserve.cummins.com/info/index.html

Here is the Inline reader kit we pretty much all use here... You will need this, just buy it. https://www.ebay.com/itm/Cummins-INLINE-...SwIJlZ9U~7

Rawze is correct regarding power, the gear ratio in these newer trucks is rarely suited to the application the truck is intended to perform. And of course the first place everyone goes is the motor. That should be the last place other than say overheads and EGR tuneups.

And you do know about the fuel pumps on the 2250 and newer motors? That would be my first priority on that particular motor.

I do not know where you are located, but Mr Hag is in GA, just south of Atlanta in Griffin, Haggai Automotive and Diesel, look him up. He is the one trusted shop that most of us use if the need arrises.

My advice, purchase the reader I linked to above, and get copies of the ECM files to Rawze so that he can inspect.

If that 2250 has had someone in the ECM playing with the mandate, odds are it is a bad file and doing damage to the motor. This is nothing to play with, unless you are flush with cash.

First thing I would do while waiting for the reader is to complete an EGR tuneup on both motors, replacing the needed sensors, mainly the Intake Manifold Pressure Sensor and the Exhaust Back Pressure Sensor, both motors have these two sensors, buy two of each. On the 871 there is a video linked to above in the video section regarding your 871, watch that series in regards to the EGR Tuneup, as the 871 has one sensor the 2250 does not, the Differential Pressure sensor, I would inspect and replace if it is original. There are other sensors too, and of course the dosers, but wait on those until you get Insite up and running, no use throwing money away at this point.

I would also do an overhead on both motors, you really should be under the valve cover inspecting the cams and lobes, along with the valve adjustment. It is not difficult to do, there is a video on that too in the Rawze video library at the top of the page. I would not trust a shop to do this overhead properly, unless you can stand there and help or at least observe. If you do not have the tools to do an overhead, you really should invest a few bucks and do just that.

The ISX, once you get to know it, is a very simple motor with a few quirks. But until it is understood what is going on, it can be a bit overwhelming, as all of these new EPA motors are.

If you have not figured it out yet, running off to a shop will drain your bank account quickly, so take the time to learn everything you can about these motors and purchase the needed tools to care for and maintain them. The days of GTO are long gone, and relying on shops to keep your trucks healthy is foolishness. Many of us here were on the verge of bankruptcy before finding Rawze and this site. I was. Time to get your hands dirty. Oh, and welcome aboard!