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 ...
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Which GM Engines Don't Have The AFM System?

In an effort to help meet more restrictive emissions standards, GM launched a technology in 2005 that deactivates engine cylinders during undemanding driving scenarios. Known by both Displacement on ...
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GM 6.2L V8 L87 Engine Never Had This Fuel-Saving Feature Constraint

As a result of production constraints and logistics issues stemming from the COVID-19 pandemic, GM decided to remove certain features from a number of its production vehicles. One of the most notable ...
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Which GM Trucks And SUVs Had DFM (And Auto Stop-Start) Removed During COVID

During the COVID-19 pandemic, supply chain disruptions and semiconductor shortages forced automakers to make some tough decisions. For GM, one of the compromises was the removal of Dynamic Fuel ...