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NOTE: If you were in a situation where you’ve installed the AFM delete kit, but don’t have access to a programmer -a disabler can still be a viable option. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. Which Option is Best-a Disabler or Delete Kit?Īs long as a lifter hasn’t started to fail, you can get by with a less-expensive disabler as preventative maintenance. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines.

Excess oil will be pushed out of the pressure relief valve into the oil pan.

When you eliminate the AFM system, the extra oil is no longer needed. NOTE: A disabler device should ONLY be used if the valvetrain is in good working order.Įngines with AFM use a high-volume oil pump. It’s a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. It prevents the computer from switching over to four-cylinder mode.

It is also recommended that you switch to a standard-volume oil pump.Īn AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard.

It’s a little more work, but it’s recommended that you plug the pressure relief valve in the oil pan.

You will need to turn off the AFM system using a computer programmer or custom tuning.

The engine will have 25 less pounds of compression in those four cylinders which can result in a misfire code.

You MUST upgrade to a non-AFM camshaft because the cam lobes in the four AFM cylinders are ground differently.

It replaces the AFM components with standard parts. Install an AFM Delete KitĪn AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. There are two ways to disable or delete Active Fuel Management on your GM or Chevy Gen IV LS or LS-based Vortec engine-one is to install an AFM Disabler, and the second is to install an AFM Delete Kit. How to Delete or Disable AFM on GM/Chevy Engines

AFM lifters have a history of failing and oil consumption can be a problem.

Some drivers want V8 power under their foot at all times.

Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust.

How Does AFM Affect Performance?ĪFM is good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. It is also known as Displacement on Demand (DoD) or cylinder deactivation. Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption.