GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 5 of 5 FirstFirst ... 345
Results 41 to 44 of 44
  1. #41
    Sr. Apprentice
    Join Date
    Jun 2010
    Sunny San Diego.


    I think the problem with AFM as a whole is the highway speeds of today. When I had AFM activated and was cruising at highway speeds (let's say 65 for shiggles) I spent far more time in 8 cyl mode than I did in 4 cyl mode. I think there ought to be a software update for that, but I hate most things electronic anyway.

    Adam - Wherever the Navy puts me
    2007 Chevy Silverado Regular Cab
    22x10 KMC LO-FI w/ 305/40R22 Yokohama Avids
    Ground Force 2"/4" Lowering Kit
    Eagle Eye Projector "Halo" Headlights
    RECON smoked tail lights
    RECON smoked third brake light
    5.3L V8 Flex Fuel
    Banks Power Ram-Air Intake
    TEA Stage 1.5 Heads
    Comp Cams 54-450-11
    Dynatech Full Length headers
    Dynatech Intermediate pipe with hi-flow cats
    2.5" Single-in, Dual-out Magnaflow muffler
    296 rwhp
    306 ft-lb torque

  2. #42
    Sr. Mechanic
    ljmueller's Avatar
    Join Date
    Jan 2011
    Watertown, Wisconsin


    I agree with what hot rod was saying( i think). On my truck it seems that tha AFM kicks it into 8 cylinders a little too early sometimes. Like when driving on fairly flat roads and barely picking up the throttle, it almost instantly goes to 8.
    2008 Silverado LT 5.3, Rancho 4", 18x9 XD Addicts, 295/70/18 Nitto Trail Grappler m/t's, Westin brush guard, Go Rino steps, Truxedo lo pro cover, magnaflow, tow mirrors.

  3. #43


    kinda makes me glad i have a 05. dont have these issues.

    corse my mileage may suffer a bit for it, but thats ok, i bought a truck not a car.


    2011 GMC Sierra SLE 5.3 Z71 4X4 Stealth Gray Metallic / 2004 Chevy Impala LS 3.8 Cappuccino

    Tow mirrors - Diablew Tuned - Flowmaster Regular 40 - Ready Lift 2.5' lift - BFG LT A/T K/Os - Carr Light Wing - TruckLite LED lights - Optima Red Top - 50% Front Window Tint - Line-X bedliner - Airaid MIT - Tekonsha P2 - ARS Billet Grill - Fia custom fit seat covers

  4. #44
    Sr. Apprentice black03silverado's Avatar
    Join Date
    Dec 2006
    new brunswick Canada


    well here is my discovery i installed a diablo predator on the diablo tune setting,i use 91 octane fuel my truck has 31" tires, i shut off the afm,set the tire size, shut off the speed limiter and the truck gets 21 mpg...... it is a 2008 silverado 4x4 ec/sb with a 5.3l 4l60 trans and 3.73 gears.... i just plug and play so this is real world.the truck has a magnaflow catback and a drop in k and n filter no other mods..........yet. hehehehe. hope you guys find this info useful!!
    2008 chevrolet silverado ec/sb 5.3L Z71
    magnaflow dual cat-back exhaust
    K&N filter
    chrome grille
    chrome mirror and door handles
    bed caps
    gm boxliner
    stainless tube steps
    chrome bugger

Page 5 of 5 FirstFirst ... 345

Similar Threads

  1. Replies: 17
    Last: 01-08-2013, 10:52 PM
  2. Active Fuel Management ~ add to older Chevy truck?
    By iouhc19 in forum Chevy C/K Truck Forum
    Replies: 2
    Last: 09-21-2009, 11:30 AM
  3. 09 Colorado fuel managment module
    By Trex in forum Chevy Colorado Forum (GMC Canyon)
    Replies: 0
    Last: 07-27-2008, 02:19 AM
  4. MPG with Active Fuel Management
    By 08SilveradoWT in forum Performance & Fuel
    Replies: 13
    Last: 07-14-2008, 01:20 AM
  5. active fuel management
    By iouhc19 in forum Performance & Fuel
    Replies: 1
    Last: 12-01-2007, 01:33 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