GM AFM VLOM
The GM Active Fuel Management, or AFM Engines in 2005-2014 5.3L and 6.0L Passenger Cars, Trucks and SUVs are prone to lifter failures. These lifters are expensive and labor intensive to replace. As is common with lifter failures, the lifter usually gets the bad rap for failing, but are usually the result of some other problem. It is commonly dirt, or in this case, the failure of the Valve Lifter Oil Manifold, or VLOM, to deliver consistent, adequate oil pressure to the lifters. The VLOM has electrically operated solenoids which switch oil pressure to the 4-AFM cylinders. When the VLOM fails due to wear, dirty screens, or other problems, it must be replaced or subsequent failures are likely. It is safe to say that a $200 VLOM is good insurance against a comeback on a $2,000+ lifter job.
Mark Sarine
Sterling Engine Parts, Inc.
Dania Beach, FL
May, 2018
