AFM Delete procedure

[Eric34]

I have a 2007 Silverado 6.0 vortec max (135000 miles) with a collapses #7 lifter. I am trying to do an AFM delete without changing the cam. I changed the 2 #7 lifters with AFM lifters, reprogramed the ECM and blocked the oil passage with a new non AFM Valley cover. I am not sure why the new lifters are activating without oil pressure from the VLOM.  I don’t want to change the cam so I need to reinstall AFM lifters.  Could it be that oil pressure is building up from the AFM lifter since the passage to the VLOM is blocked?

 

Thanks

 

Eric

[CamGTP]

Good question. You'd have to reverse what you did with the VLOM to find out if that is the cause.