What Is Active Fuel Management (AFM) And Why Can It Cause Lifter Noise?

General Motors' active fuel management system is an ingenious piece of engineering. Here's what it does, how it works, and why some hate it.
GM Authority

Reply To: Active Fuel Management's impact on engine braking

Alex Luft, Thank you for taking the time to help me out. Since I posted my question, I found on the net a description of exactly how AFM works. The article explained how, in addition to cutting off ...
SlashGear

What Does An AFM Disabler Do And Does It Cause Engine Problems?

General Motors's Active Fuel Management (AFM) technology utilizes hydraulic valves, solenoids, and advanced software to shut down half of the cylinders in a V8 or V6 engine to save fuel. The system ...
Hot Rod

Simplifying the Gen IV Chevy by Removing Active Fuel Management

Way back in 1981, Cadillac, reacting to the same pressure to maximize fuel economy automakers face today, came up with America's first mass-produced, variable-displacement, gasoline, V8 engine. Known ...
GM Authority

Range Technology Offers DFM Disabler For Chevy Silverado, GMC Sierra, SUVs: Video

Not everyone likes the driving experience that comes with Dynamic Fuel Management (DFM) or Active Fuel Management (AFM). Some drivers claim turning off cylinders while driving with the goal of ...