GM's AFM and DFM often get blamed for lifter failure, so let's explore how they work

The idea behind GM's active and dynamic fuel management systems is brilliant, but they may be asking too much of the poor hydraulic lifters.
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

Pit Stop: Deleting LS AFM; Is VVT Good for Performance?

QUESTIONI'm in the process of transplanting an L77 from a 2012 Caprice 9C1 PPV [police pursuit vehicle] along with its 6L80E [six-speed, longitudinally mounted electronic automatic overdrive ...
GM Authority

Reply To: 2010 Chevy Suburban 5.3L Vortec (Engine Tick) Lifter Issue? AFM?

I had a lifter stuck collapsed on my 2013 5.3 Gmc sierra. Went on Youtube and watched Crazed performance repair. I did exactly like him, removed the flom, blocked the oil supply to the solenoids and ...