CM870 ghost derate

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(09-21-2022 )Rawze Wrote:  when is the last time it had the egr circuits replaced?.. the Delta-P sensor and feed tubes for it?... that can cause it too, if it in fact not deleted.

try driving it with the EGR temperature sensor unplugged and see if some of its issues clear up. The CEL will be on, but the entire EGR system will switch itself off.

[Rawze]

(09-22-2022 )ads1 Wrote:  ...Any thoughts on why my turbo inlet temp is stuck at 59 degrees and turbo outlet (calculated) stuck at 400 and something? Cold or hot that’s what they show, never move. Inlet sensor is new genuine Cummins.

59-deg turbo inlet temp. is the default reading if the sensor is not plugged in.

many of those bad delete programs will bypass those signals so that some complete moron can install a manual turbo onto it. If it has the wrong program in it, or maybe a delete program then that may be why.


If u unplug the EGR valve, does it get a check engine light?.

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I very much appreciate the fresh ideas. I will try and check it out tomorrow and update you.

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(09-22-2022 )Rawze Wrote:  

(09-22-2022 )ads1 Wrote:  ...Any thoughts on why my turbo inlet temp is stuck at 59 degrees and turbo outlet (calculated) stuck at 400 and something? Cold or hot that’s what they show, never move. Inlet sensor is new genuine Cummins.

59-deg turbo inlet temp. is the default reading if the sensor is not plugged in.

many of those bad delete programs will bypass those signals so that some complete moron can install a manual turbo onto it. If it has the wrong program in it, or maybe a delete program then that may be why.


If u unplug the EGR valve, does it get a check engine light?.

I think you nailed it. I had a couple of minutes and unplugged both connectors at the EGR valve and no check engine light. So I’m stuck with paying Cummins $500 to reprogram my ECM or seeing if someone could walk me through how to do it myself with Insite. I’m sure I could research it enough to figure it out eventually, but I don’t have the time right now. Your thoughts?

[Bengy88]

Send me a pm with esn, contact info, and version of insite you are using. It will be a day or two before I can help you due to a death in the family but we can get you straight.

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(09-22-2022 )Bengy88 Wrote:  Send me a pm with esn, contact info, and version of insite you are using. It will be a day or two before I can help you due to a death in the family but we can get you straight.

Private message sent. Thanks

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For anyone that reads this thread…. A BIG thank you to Rawze and Bengy88! In fact this truck had a bad delete in the ECM. An ECM reflash with a good program and she’s back to running good!