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.
AOL

Can An Active Fuel Management (AFM) Disabler Cause Engine Damage?

So, you're worried your Silverado or Sierra might run into Active Fuel Management (AFM) issues someday. But are they as bad as the internet would lead you to believe? Well, the short answer is yes.
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

GM To Offer $50 Credit On Chevy Silverado And GMC Sierra Without AFM/DFM

General Motors is starting to build light-duty Chevy Silverado 1500 and GMC Sierra 1500 pickup trucks without Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) technologies as a result of ...
GM Authority

Reply To: Does the L96 have AFM?

AFM is Active Fuel Management which used a solenoid to deactivate the lifters on select cylinders of the engine. Yours has standard lifters so no AFM. Get our GM news straight to your inbox. We'll ...