GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 2 of 3 FirstFirst 123 Last Post byLast Post by
Results 11 to 20 of 21
  1. #11
    Jr. Mechanic
    Join Date
    Mar 2013
    Location
    adirondacks,n.y.
    Posts
    113

    Default

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

  2. #12
    Legend


    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Location
    Piermont,NY, back in Northern NJ now, But may be in IL soon....
    Posts
    5,357

    Default

    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.
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  3. #13
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
    Posts
    1,468

    Default

    Quote Originally Posted by geo1 View Post
    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??????

  4. #14
    Legend


    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Location
    Piermont,NY, back in Northern NJ now, But may be in IL soon....
    Posts
    5,357

    Default

    Who wants to be a TEST Rat for GM?

  5. #15

    Default

    Quote Originally Posted by Enkeiavalanche View Post
    Who wants to be a TEST Rat for GM?
    WE DO, WE DO; and everyone with a 5.3 AFM waves their hands
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  6. #16
    Legend


    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Location
    Piermont,NY, back in Northern NJ now, But may be in IL soon....
    Posts
    5,357

    Default

    I'm still in it..

  7. #17

    Default

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

  8. #18

    Default

    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?
    KCCO!

  9. #19
    Legend


    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Location
    Piermont,NY, back in Northern NJ now, But may be in IL soon....
    Posts
    5,357

    Default

    Go to dealer and talk to the Service guy..

  10. #20

    Default

    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.

Similar Threads

  1. Replies: 0
    Last: 01-24-2013, 07:50 PM
  2. Blue Smoke at start now while driving.... Not Happy......
    By Enkeiavalanche in forum GM Powertrain
    Replies: 6
    Last: 12-10-2012, 12:27 PM
  3. Replies: 0
    Last: 11-05-2012, 08:40 PM
  4. Replies: 0
    Last: 10-16-2012, 06:10 PM
  5. Warm start black smoke
    By RussCrypto in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 14
    Last: 12-12-2008, 05:14 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •