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  1. #1

    Default Active fuel management

    I am new to the forum and thought i would try it, i brought a 2011 silverado last month brand new and have put about 1200 km on it so far
    I am happy with the truck but have yet to see it kick down to 4 cyl, the first gear shifts pritty quick making second gear lag a bit
    Have i inherited some known problems, i have the LC9 5.3 vortec with AFM

  2. #2


    I think I know what you are talking about. Try this thread. This was a resent conversation. If I’m wrong someone else will have the answer.!!!!#axzz1uIycfiEJ
    Tim Walters (Curky)

    Wrangler AT/S 265/70R17 - Trail-FX window vents - Husky fitted splash guards - Silver Star zXe - Leveling kit -

  3. #3


    Thanks, seams like most people want it off
    Now some what confused

  4. #4

    mfleetwood's Avatar
    Join Date
    Jul 2010
    Denver, CO
    Blog Entries


    Welcome to the Club!! It's a matter of preference regarding the AFM, as there are some people who really like and some that hate it. Just use the search function near the upper right corner and do a little may help you become less confused or confuse you even more

    Just to confirm though, you have the AFM indicator in your dash readouts and you never see it change from 8 to 4 even when letting off the gas for a period of time (i.e. going down a long hill)?

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  5. #5


    If your cruising on the interstate at a low rate of speed you should have seen, heard, and felt it kick down. I have an 2011 5.3 and I noticed it the first time out on the interstae the first day I bought it. Something might be different with the 2012 not sure, but something doesn't sound right.

    2011 GMC SIERRA CREW CAB 2WD W/5.3

    Convenience Package
    : Adjustable Pedals, Remote Start, Electric Rear Window Defogger, Rear Parking Assist

    Power Tech. Package| Volant CAI| GMC Upgraded Grill| Line-X Premium Bedliner| AVS Smoke Headlight Covers| Demolded| AMI Black Grill Emblem| AMI Black Rear Emblem| EGR In-Channel Window Visors| IPCW Third Brake Light| IPCW LED Fiber Optic Tail Lights| IJDM Dome & License Plate LED's| Flowmaster Exhaust W/ 3" Black Chrome Tips| OEM 20" Rims W/ Goodyear Eagle LS2

    You can't get away from the STORM!

  6. #6


    Yeah mine works pretty good when I have it in tow/haul mode. Especially from 30-45mph. I dont mind it at those speeds and according to the dic im getting good mpg when its kicked in. Also doesnt sound to bad with the dual exhaust on it..If I was geared correctly for the larger tires it would probably work even better for me. It sounds like your shift points are not programmed correctly not allowing it to kick in. I would have it checked out.

    2011 Silverado CrewCab 5.3L*Ram Air Look Cowl Induction Reflexxion Hood*6" Pro Comp Lift*Flowmaster Dual exhaust*Perfect Launch Rear Diff. Cover*Led Smoke Taillights*L.E.D.Smoke 3rd Brakelight*60" L.E.D. Tailgate Bar*Rearview Mirror Reverse Camera and Sensors*Smoke Headlight Covers*Front Bumper Grill Insert*Deezee Black Alum. Diamond Rail covers*20" Ultra Motorsports Rims wrapped with 35.5"B.F. Goodrich Tires*Inchannel Raingaurds*CAI*Bullydog GT Tuner*Alpine Amp*Boss 6x9's*Boston Acoustic Subs*Terrantula Tweeters*Custom Sub box*Red Led Interior Accents*5% Ultimacool duo tint rear window and doors, 20% front doors*Custom Vinyl Graphics*Demolded*Debadged*Painted drums and calipers*
    Future Mods Include: Custom Interior Hydrographics, Electronic Rollup Toneau Cover, 4.56 Gears, Painted rear bumper

  7. #7


    Thanks folks, it's going in today will no more on friday i'll keep you posted

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