not sure, its a nnbs 6.0, how will i know if its afm?

 

active fuel management, not sure how to tell. but loosing oil is a common problem with afm motors

 

Play with your DIC until it shows real time mpg - it will also show 4 or 8 cylinder mode. If it ever shows 4 then you have the AFM motor with the crappy lifters among other things.

 

but you did say there was a knocking. Even the 5.3 I have had lifter issues, but fortunately they were covered under the extended warranty.

I was reading about those AFM motors, and wasn't quite sure that it was the issue.

I bet that if Max07 were to call the dealership and ask if the VIN on his truck read AMF, that could put him in that group. From there he maybe able to pinpoint "lifters of AMF blocks", just a thought.

 

ok i had a blond moment, yes i have afm cause i had it turned off in my tune. But i am about to cam it and am doin a dod delete so i will be gettin rid of all that crap so could that fix my issue?

 

you should be fine when you do your cam and dod delete iirc. my brother in law has the same problem with his 08 i keep trying to convince him he needs a cam so we can do a dod delete lol

 

I've fixed a few AFM 5.3L's for the dealership and it's the oil rings are stuck and carboned up along with excessive ring wear. I have been changing the piston's rings, and honing the cyl's. It has fixed the problem for now but I'm sure it will be back. That AFM is a shitty deal I would get rid of it asap. I just did one this last week here is the piston out of a 90K MI 2007.5 AFM I just pulled apart. Heads are nasty too...

 

Dam that don't look good for only 90k. After seeing those pics I don't think the valve cover replacement will do the job on my 5.3 6.2l here we come lol I wish.