What Is Active Fuel Management?


A vehicle that drives long distances is prone to excessive oil consumption, which is caused by the AFM. In these types of trips, the engine does not suffer much stress, so the AFM system deactivates the pistons. Over time, excess wear on the rings and cylinders can result in engine damage.

How Does The Active Fuel Management Work?

When an engine is being used for some driving situations – such as highway cruising – Active Fuel Management uses only half of its cylinders, and then seamlessly reactivates the other cylinders when the driver demands more power for acceleration, grade climbing, or hauling.

What Vehicles Have Active Fuel Management?

Active Fuel Management is available on the Chevrolet Avalanche, Chevrolet Impala, Chevrolet Silverado, Chevrolet Suburban, Chevrolet Tahoe, and Chevrolet TrailBlazer vehicles. The variable displacement technology offered by other automotive manufacturers is similar.

Should I Turn Off Active Fuel Management?

When an AFM lifter fails, or when performing upgrades, an AFM Delete Kit is recommended. If you want to turn off the AFM system, you must use a computer programmer – or custom tuning. Additionally, you should plug in the pressure relief valve in the oil pan and check the oil pan for leaks.

What Is Active Fuel Management System?

A GM engineer developed Active Fuel Management (AFM) in 2005 to help improve fuel mileage from some of their V6 and V8 engine applications. When your engine is running at a low load or cruise speed, AFM shuts off half of its cylinders to reduce fuel consumption.

Does Active Fuel Management Really Work?

In the real world, AFM and DFM have shown some benefits when it comes to improved fuel mileage, and GM has been able to claim that its fuel mileage has increased by 5-7% directly correlated to AFM. The AFM/DFM vehicles switch between running on half cylinders and all cylinders, causing some customers to experience “shuddering”.

Is Disabling Afm Bad?

It is not the disabling devices that solve oil consumption issues, but rather the high pressure oil pump that bypassing the lifters and squirting the lower cylinder walls that actually makes them worse. I would leave it if it is a post 12′ vehicle. There is no evidence that the lifters cause any problems.

Should I Delete My Afm?

If an AFM lifter fails or if you are doing performance upgrades, you should get an AFM Delete Kit. In place of the AFM components, it uses standard parts. A non-AFM camshaft is required when installing an AFM delete kit since the cam lobes in the four cylinders are ground differently.

How Does Gm Dfm Work?

Dynamic Skip Fire, or DFM, is a technology developed by General Motors that uses only the cylinders of an engine that are needed during a particular driving scenario to save fuel. DFM is activated when a V6 or V8 engine is cruising down the highway.

What Causes Afm Lifters To Fail?

Oil pressure issues or control issues are the most common reasons for lifter faults. The Valve Lifter Oil Manifold or VLOM controls the AFM’s activation and deactivation. The job of this valve is to direct pressurized engine oil to the active fuel management intake and exhaust valve lifters.

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