unplugging the egr and regan

[DSoutherland]

So i've been reading about you guys unplugging the egr and getting better fuel milage. I unplugged mine this morning. put 200 miles on the truck ,and it went into regan. I have a pryo located about 2 inches after the dpf. During regan temps are around 1100 to 1200 degree's, today with the egr unplugged i got 600 to 850 and a 80% full see owners manual chime. is anyone else checking regan temps with the egr unplugged?

 

[Bob4x4]

Using the factory pyro it must be above 900 degrees to regen IRRC.



Bob

 

[HWork]

Were is the factory pyro located and can one tie into it?

 

[Bob4x4]

The t/couple is downstream in the exhaust and would not be much good at monitoring engine egts

 

[HBarlow]

Using the factory pyro it must be above 900 degrees to regen IRRC.

Bob

That's new information! I didn't know there is a factory pyro in the system. I assume the ECM reads it. Would you explain how it is used?

 

[Bob4x4]

The Diesel Exhaust Temperature Sensors are thermistors and change resistance based on the temperature being measured. The Engine Control Module (ECM) provides a 5 volt reference voltage to the sensor. The ECM monitors the change in signal voltage and converts this to a temperature value.



When the exhaust gas temperature is cold, the sensor resistance is high, the Engine Control Module (ECM) will sense the resistance and sense the exhaust temperature as cold.

When the exhaust gas temperature is high, the sensor resistance is low, the ECM will sense the resistance and sense the exhaust temperature as high.