A common issue with the 5.3 engine is AFM lifter failure. In this video, we diagnose the problem and replace the failed AFM lifter and pushrod to get the engine running properly again. Follow along ...

Jasper Engines & Transmissions releases General Motors (GM) Gen IV 5.3L Class 1 engine, with an available DOD/AFM Deleted option. The remanufactured engine is available for model-year 2007-2009 ...

When General Motors launched Active Fuel Management (AFM) and then, Dynamic Fuel Management (DFM), the idea was that the fuel consumption of truck and SUV owners could be improved by turning off ...

CarComplaints reports that a federal judge just handed GM a significant procedural win in the long-running engine lifter class action, denying the plaintiffs’ motion to sever the case into two ...

The L99 is a 400-horsepower engine while its fraternal twin--LS3--is rated at 422 hp. The difference lies in the valvetrain; as the short-block, heads, and intake manifold are identical. One small ...

You can pick your nose, but you can't pick the engine for your fifth-gen Camaro SS--those who opt for the automatic transmission get an L99 under the hood while a manual transmission-equipped ride ...