'08 Silverado, smoke upon start up

[geo1]

lost me ,what is amf,learing as i go on here ,thanks

[Enkeiavalanche]

When it goes from 8 to 4 Cyl and back.. There is a TSB on this I just had the work done to my 08 5.3.

[j cat]

lost me ,what is amf,learing as i go on here ,thanks

AFM this is active fuel management. the engine PCM determines when you need more power then it has all 8 cylinders working when at idle coasting you drop out cylinders to conserve fuel. this type engine has issues with oil .

I have read GM plans to dump these engines. new engines 2014. direct injection with variable valve timing . this is a good design to get max power and MPG. The question is can GM do it successfully??????

[Enkeiavalanche]

Who wants to be a TEST Rat for GM?

[RayVoy]

Who wants to be a TEST Rat for GM?

WE DO, WE DO; and everyone with a 5.3 AFM waves their hands

[Enkeiavalanche]

I'm still in it..

[RayVoy]

This conversation is reminding me, that I should check my oil level in the morning.

[BlackBowtie]

Ah yes, I do have the AMF motor.. so im guessing that explains alot.
I warm the vehicle up on cold mornings.. is this hurting it?
So I guess I have to live with this?

[Enkeiavalanche]

Go to dealer and talk to the Service guy..

[Old Iron nut]

I'm not familiar with this engine but due to mileage, age, or other gremlins you could have a problem with valve seals. I have an older GMC truck that currently has this problem. Cheers, Old Iron nut.