What is an AFM lifter?
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.
When did GMCs envoy start using Active Fuel Management?
I’ve read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007.
Why is my GM V8 lifter not working?
This may be the result of an AFM (Active Fuel Management for displacement-on-demand) lifter that unlocks as soon as the engine is started or one that is mechanically collapsed/stuck. This TSB applies to the following vehicles:
How to disable Active Fuel Management on GM engine?
Should you delete Active Fuel Management on GM engine? There are two ways to disable active fuel management on a GM vehicle, but first you have to determine whether your engine is a candidate for the delete or disable procedure.
Which is lifter oil manifold assembly is used for AFM?
The Lifter Oil Manifold Assembly (LOMA) is only used on AFM applications. DFM is the next generation in cylinder deactivation systems. It features AFM technology with the additional ability to deactivate any combination of cylinder valves to optimize fuel consumption.
I’ve read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007.
Do you need a new lifter for a GM 5.3?
And premature failure., New lifters require updated GM VLOM# 12571609 for proper function., Failure to replace VLOM will void Warranty, Fits GM 5.3 engines with AFM – vins ” 0,3,J and M” Would you like to tell us about a lower price? Video Player is loading. This is a modal window.
What is the filter screen on a GM valve lifter?
The screen (see illustration) is actually a filter for the valve lifters on those GM applications equipped with AFM. The purpose of the filter screen is to help control contamination that can affect the AFM hydraulic system by filtering the oil that flows through the valve lifter oil manifold and its related solenoids.
What kind of lifters do AFM engines use?
3. Lifters. AFM engines use special lifters for cylinders 1, 4, 6, and 7. They are taller and have special oil holes. Engines with AFM also use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan.