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'08 Silverado, smoke upon start up

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by BlackBowtie, Mar 4, 2013.

  1. geo1

    geo1 Member 1 Year 100 Posts

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

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    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.
  3. j cat

    j cat Rockstar 4 Years 1000 Posts

    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??????
  4. Enkeiavalanche

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    Who wants to be a TEST Rat for GM?
  5. RayVoy

    RayVoy Well-Known Member 2 Years 1000 Posts

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

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    I'm still in it..
  7. RayVoy

    RayVoy Well-Known Member 2 Years 1000 Posts

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

    BlackBowtie New Member

    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?
  9. Enkeiavalanche

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    Go to dealer and talk to the Service guy..
  10. Old Iron nut

    Old Iron nut New Member

    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.

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