An increase in exhaust temperature in your truck could be due to several reasons. One common cause is a malfunctioning fuel injector which can make the engine run lean, leading to higher exhaust temperatures.
It could also be due to a faulty exhaust gas recirculation (EGR) valve that’s not working properly, causing the engine to run hotter than it should. Or, there could be an issue with the turbocharger, if your truck has one.
As you’ve been driving for over 10 years, you know it’s important to address these issues swiftly to prevent further damage.
I’d recommend having your truck checked by a professional mechanic to diagnose the exact problem.
Stay safe on the roads, Sarah!