#AFM
Guides, installation tutorials and product updates.
Does Changing Oil More Often Save Your Lifters? What It Stops, And What It Never Could
An oil change resets what is in the sump. It does not reset the duty the lifter is asked to endure. Three failure routes answer to the fluid and three answer to load and cycle count, and only the first three move when the interval changes.
Oct 07, 2026 · 32 views
P0420 Before You Replace The Converter: What This Code Proves, And What It Does Not
P0420 reports the gap between two sensor signals, not a failed part. Three unrelated faults produce that same gap, and the order you check them in decides whether the replacement holds.
Oct 05, 2026 · 33 views
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