Afm help
Thread Starter
Joined: Dec 2006
Posts: 1,160
Likes: 31
From: New Port Richey, FL
Afm help So had a 2007 6.0 avalanche with afm with no power and lifter tapping. Replaced vlom , 8 new afm lifters and 8 new ls7 style lifters. 50 miles later, back to running the same again... Any thoughts before saying do a afm delete...
Thanks in advance
Thanks in advance
TECH Senior Member
Joined: Jun 2016
Posts: 22,301
Likes: 3,625
From: Central Cal.
How's the oil pressure? If low, that would de-pressure the DOD lifters and put you in 4 cyl mode.
Seriously, DOD/AFM is a can of worms best deleted. We have a suburban with DOD and I notice the only time it's in 4 cyl mode is on decel, or coasting, when fuel is hardly used anyway. And since Avalanches are basically a cut-down Suburban, the same would apply to them. Deleting AFM/DOD would hardly affect fuel economy.
Seriously, DOD/AFM is a can of worms best deleted. We have a suburban with DOD and I notice the only time it's in 4 cyl mode is on decel, or coasting, when fuel is hardly used anyway. And since Avalanches are basically a cut-down Suburban, the same would apply to them. Deleting AFM/DOD would hardly affect fuel economy.
Did you replace the cam? When my '08 5.3 Avalanche started making noise, it ended up being a non-AFM lifter wheel that took a crap and wiped out a cam lobe with it. I replaced everything and deleted the AFM from the stock tune.
Thread Starter
Joined: Dec 2006
Posts: 1,160
Likes: 31
From: New Port Richey, FL
Ended up blowing my mind what it was... Thanks to mellings site and info from afm lifters... Gave me an explanation that was a long shot in dark but found the cause... Bc 1 week later... Same afm lifter again! I really do not think many ppl encountered what I did on that ly6 6L
