870 demandate question

[Redland1]

I ran across an old Waterloo post where he was saying that on the 870 you have to remove the center plug pin for the Delta P sensor even though the truck is demandated because it can put it into a silent derate.Just did the pin removal yesterday.Is there anything else that needs to be done on a CM870 once demandated? Besides removing the cooler if one wants to which I did and putting in a block plate where the EGR went.

Asking because my truck hasn’t been running the best and has poor fuel mileage as well.

[marek4792]

is the intake manifold also blocked off too?

[Redland1]

(08-17-2023 )marek4792 Wrote:  is the intake manifold also blocked off too?

Where the EGR gases entered the intake

[marek4792]

Yup! It's surprisingly common for them to be improperly blocked off or not at all..

[Rawze]

(08-17-2023 )Redland1 Wrote:  I ran across an old Waterloo post where he was saying that on the 870 you have to remove the center plug pin for the Delta P sensor even though the truck is demandated because it can put it into a silent derate.Just did the pin removal yesterday.Is there anything else that needs to be done on a CM870 once demandated? Besides removing the cooler if one wants to which I did and putting in a block plate where the EGR went.

Asking because my truck hasn’t been running the best and has poor fuel mileage as well.

A long time ago, it was common to modify the Delta-P or the EGR Temp sensor to help get/KEEP the engine operating in mode-4 (its factory non-EGR mode), however...

- On a well made CM870 program with proper engine mode control re-mapping, you should not have to un-pin the Delta-P or any other sensor these days. I pointed out some of those mode control issues, and their solutions to the guys doing 870's on the forum here back a few years ago, whenever Merick on the forum here came over with his truck that time, and we reviewed his engine file.