wjburken
Supporting Member
Yes, 2007 5.3’s had AFM without VVT. My 2007 6.2 had VVT without AFM.so there's an engine combo that had afm but not vvt? wow gm made some weird combos thru the years.
and the non vvt timing gear set bolted up to your vvt cam? I'm surprised that's not all different. I've seen drawings of the oil passages to engage it, it runs thru the hollow front of the cam but never had one apart in my hands. I'd be worried about oil pressure from the front cam bearing running out the front of the cam without the vvt hardware?
kinda wild, I'd have thought it wouldn't have made much difference tuning wise, the vvt in these ls only move a few deg. it's not like an over head twin cam engine that moves things all over the map.
have you read back the tune after you saved it to make sure the upload took with the afm disabled? I have a odd ball truck, so don't think this is the same for you. but mine stock has disabled in the afm drop down box when it's turned on, but move it to enabled and it turns it off. it very well could be a hybrid only type-o but it's caught a lot of people out on the hp boards saying it's not supported. it is, it's just backwards. again, this very well could be a hybrid only thing, totally different ecm tune and all. just throwing it out there incase.
I am also curious about the upper timing sprocket/cam combination because as far as I know, the VVT cam uses a VVT phaser sprocket and a VVT actuator which also serves as the bolt. At least in my 2007 6.2, that was the case.