Description. ACDelco GM Original Equipment Engine Valve Lifter Oil Manifolds are GM-recommended replacements for your vehicle’s original components. This manifold contains solenoids that control the opening and closing of the valve system, helping prevent fuel and air from reaching deactivated cylinders.Click to see full answer. People also ask, what causes AFM lifters to fail?We have found that most lifter faults are caused by oil pressure issues, or control issues. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters.One may also ask, what is an AFM lifter? 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. It is also known as Displacement on Demand (DoD) or cylinder deactivation. In respect to this, is AFM good or bad? AFM is good for gas mileage. AFM engines are 5-7% more fuel efficient. However, AFM lifters have a history of failing. Oil consumption has also been a problem.Will disabling AFM save lifters?In addition to working on the top of the engine, you should also remove the oil pan and plug the pressure relief valve in the oil pan. In other words, performing an AFM delete will NOT save you money over simply replacing the AFM valve lifters with new units.

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