5.3 Engine Issues and Recommendations Archives - Utvoffroaddealership

5.3 Cylinder Deactivation Problems: What You Need to Know

5.3 cylinder deactivation problems

GM’s fuel-saving Active Fuel Management (AFM), later renamed Dynamic Fuel Management (DFM), in their 5.3L V8 engines has been a source of both praise and headaches for truck owners. This technology aims to improve fuel efficiency by seamlessly switching off half of the engine’s cylinders during light-load driving. While great in theory, 5.3 cylinder deactivation … Read more