Diesel Repair Blog for Trucks and RVs

A diesel engine can seem to run perfectly fine at idle or during light driving, then suddenly feel weak when climbing a hill, towing, accelerating, or pulling a heavy load. That can be frustrating, but it also gives us an important diagnostic clue. When a diesel loses power under load, the problem often involves a system that can keep up under light demand but starts falling behind when the engine needs more air, fuel, boost, exhaust flow, or cooling capacity. The important t