AFM Delete

Katherine Krisak · December 9, 2019

I'm new to the group and I hope I'm doing this correctly. I want to buy a used GMC Yukon, but I would definitely want to disable the AFM before any problems occurred. Does anybody know what this would entail and what the approximate cost would be? Any comments would be greatly appreciated , Thank you(or would this be a moot point because if I buy a used Yukon the damage could already be done?)

Edited December 9, 2019 by Katherine Krisak

CamGTP · December 9, 2019

Deleting the AFM/DoD with a programmer or plug in device like the Range AFM disabler would be a quick and easy way to shut it off.

If you want to actually remove the parts completely from the engine it would require at a minimum these parts. New camshaft, new camshaft lifters, new pushrod, head gaskets, head bolts, intake gaskets, new valley plate and gasket, new timing cover if you removed the VVT depending on what year of truck you bought. All that stuff and other little odds and ends like coolant, engine oil, gasket maker etc etc.

They sell complete kits to do this through many vendors. Then you need to have someone or a shop that does customer computer tuning to make the truck run correctly with all these new parts installed. Probably looking at maybe $700-1,000 for parts alone.

swathdiver · December 11, 2019

Don't forget the lifter trays! Lifter trays are SOP when doing lifters. They are plastic and get brittle and when they break, the lifter walks and wipes out the cam lobe.

Alternatively, you could replace the VLOM with the latest update, see if yours needs the updated valve cover and keep trucking. When the solenoids in the VLOM begin to fail, they cause a mis-timing event that damages the De-Ac lifters. Of course the lifters can fail on their own but they are usually taken out because of the VLOM. Dirty oil is AFMs worst enemy. Conversely, when car guys pick up a new truck that has had conventional oil and or infrequent oil changes and introduce full synthetic to the system; it begins to break up the sludge which clogs up the AFM oil passages causing problems too.