Pyro temperature

[citibori]

I have a 379 Peterbilt and my pyro temp has been running hot. I'm not losing any power but I have to climb grades at a lower gear than usual to keep my temp down. Any suggestions?

 

[Moot]

Check the air filters and filter holders for debris or blockage. Reduced intake air can lead to high exhaust temperatures. Do you have an air restriction gauge? Is it reliable? Are you lugging the engine before dropping a gear? Do you notice excessive smoke from the stacks as the temperature climbs? How much hotter than "normal" is the exhaust gas, several hundred degrees?

I don't know if pyrometers on newer trucks are electronic and part of the computer system where one could get a false reading. My experience with mechanical pyrometers was, either they worked or the thermocouple got fried and they didn't work.

 

[citibori]

I'm gonna change the air filters and I'll let you know and no I don't have an air restriction gauge. As far as lugging goes I usually shift between 1300 and1400 rpms