#DFM
Guides, installation tutorials and product updates.
AFM Disabler vs DOD Delete vs Tune: Which Is Right for Your 5.3 or 6.2 GM?
Three ways to keep a GM V8 on all eight cylinders, what each one physically changes, which vehicles a plug-in disabler fits, and the six questions that decide it.
Sep 24, 2026 · 314 views
AFM Lifter Failure Symptoms: 11 Signs, P0300–P0308 Codes and How to Confirm the Cause
What the misfire codes do and do not tell you, eleven symptoms each with the check that gives it meaning, the four lifter failure modes, and the test order.
Sep 23, 2026 · 193 views
AFM Disabler Problems: 7 Causes and What Actually Fixes Each
The unplug drive that separates a device fault from an engine fault, the seven reasons a module does nothing, five problems that get mistaken for it, and what a scan tool can tell you.
Sep 22, 2026 · 191 views
What Is Active Fuel Management? GM's AFM Explained
What GM cylinder deactivation actually does: the request chain that drops a V8 to four cylinders, which engine families and model years carry the system, how AFM differs from DFM, and where the lifter duty sits.
Sep 20, 2026 · 245 views