2008 Western Star 4900 - Detroit Series 60 - Stalling when Warm

Question

Pulling my hair out with this Series 60. Truck starts beautifully when cold and runs like a champ for about half an hour. Once the coolant temp hits about 180 degrees, the engine just dies like someone pulled the plug. It won't restart—it'll just crank and crank—until it sits for about two hours.

There are no codes being thrown in the DDDL software which is the weirdest part. I've checked fuel pressure during the no-start condition and it's holding steady at 60 psi while cranking. I'm suspecting an electrical component that is failing when it gets heat-soaked, but without a code, I'm shooting in the dark.

GrandmaGeartooth · Accepted Answer

✅ Confirmed fix: The Camshaft Position Sensor (TRS/SRS) was failing internally when hot. Even though it didn't throw a code, it was losing the sync signal to the DDEC VI. Replaced the sensor and the harness pigtail (which had brittle wires), and the truck hasn't stalled since. Always replace the pigtail on these older Detroits when doing sensors.

MountainMechMo · Answer

Check your ECM cooling plate. Some of these units had fuel-cooled ECMs. If the lines are restricted and the ECM gets too hot, the internal drivers for the injectors will shut down to protect the board. Feel the ECM case when the truck dies; if it's too hot to touch, that's your culprit.

2008 Western Star 4900 - Detroit Series 60 - Stalling when Warm

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