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COST FOR A MAC CONTROL MODULE FOR 2004 SUBURBAN HOW TO
COST FOR A MAC CONTROL MODULE FOR 2004 SUBURBAN INSTALL
COST FOR A MAC CONTROL MODULE FOR 2004 SUBURBAN DRIVERS
COST FOR A MAC CONTROL MODULE FOR 2004 SUBURBAN UPGRADE

The lifters return to normal operation.Īll eight cylinders are now powering the engine.

In four-cylinder mode, they act like air springs and allow for smooth operation. The AFM cylinders are opposite of one another in the firing order. The engine is running on only four cylinders. Since no air can get in or out, four cylinders provide no power.

The collapsed lifters will not engage the pushrods and both valves remain closed.

The oil collapses the plunger inside the lifter.

Oil flows to the special lifters through the AFM towers.The computer sends a signal to the LOMA.If you want to delete it entirely, it’s a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. The valve itself is part number W0133-2574213. This should be added to your earlier model if you experience oil consumption. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. The original version sprayed oil on the cylinder walls and increased oil consumption. This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. They are taller and have special oil holes.Įngines with AFM also use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. However, they are only functional on engines that used AFM.ĪFM engines use special lifters for cylinders 1, 4, 6, and 7. (Non-AFM engines have a smooth cover.)Īll Gen IV engine blocks have AFM towers and oil passages cast in.

It also has an electrical connector on the back. It’s ribbed with solenoids on the underside. The AFM cover is called the Lifter Oil Manifold Assembly (LOMA). The AFM system can be identified by its components. GM/Chevy Engines Factory-Equipped with AFM Engine Displacement You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. 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.

COST FOR A MAC CONTROL MODULE FOR 2004 SUBURBAN UPGRADE

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.

COST FOR A MAC CONTROL MODULE FOR 2004 SUBURBAN INSTALL

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.

COST FOR A MAC CONTROL MODULE FOR 2004 SUBURBAN HOW TO

How to Delete or Disable AFM on GM/Chevy Engines

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

COST FOR A MAC CONTROL MODULE FOR 2004 SUBURBAN DRIVERS

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.