Originally Posted by randyc (Post 450133)

I own a 2000 Pete dump truck with a 3126B Cat in it. It has 490000 miles on it. I recently had all the injectors replaced due to bad o-rings (oil getting in fuel) I thought that this would also solve my problem of decreasing power. It still has terrible pulling power. That engine is rated at 300 horses. It feels like I'm only getting about 250 or so. The truck was fully serviced at a reliable cat shop. I also had them to be sure that it was turned up to the max to get the maximum performance out of it. The only other thing that's crossed my mind is my cooling system. I know that it needs to be serviced and cleaned out. It does have lots of trash and buildup due to the type of work I do with it but could this be causing it to be weak in power? It does have a tendency to run hotter than it should. Suggestions?