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+--- Thread: 870 demandate question (/showthread.php?tid=9050)
870 demandate question - Redland1 - 08-17-2023
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.
RE: 870 demandate question - marek4792 - 08-17-2023
is the intake manifold also blocked off too?
RE: 870 demandate question - Redland1 - 08-17-2023
(08-17-2023 )marek4792 Wrote: is the intake manifold also blocked off too?
Where the EGR gases entered the intake
RE: 870 demandate question - marek4792 - 08-17-2023
Yup! It's surprisingly common for them to be improperly blocked off or not at all..
RE: 870 demandate question - Rawze - 08-18-2023
(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.