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
Results 1 to 3 of 3
  1. #1

    Default 2010 Silverado with strange symptoms

    I have a 2010 crew 4x2 silverado 5.3 with the AFM, 29k miles. Some issues y'all can hopefully help me out with:

    1) I get 15.5 mpg according to DIC regardless of highway or city. I baby it to death and I have a very light foot. Is this normal mpg?
    2) It shifts in and out of 4 cyl mode constantly in traffic under 35 mph and sometimes I have to depress the accelerator 1/4 down to get it to go back to 8 cyl. On occassion, when it switches, it makes a chunking noise. I can only explain the sound like going over a cattle grate at highway speed (I live in SoCAl now but grew up in the country, hehehe). Are these normal conditions for the AFM?
    3) When Im at part throttle, I hear a buzzing sound from under the dash or in the tranny tunnel. It goes away when I ease up on the throttle and/or accelerate harder. Any suggestion where this might be coming from?

    I had an 07 with zero issues and 18 mpg. Traded in hoping for a better experience.

    Please help with your comments and suggestions and hopefully I can solve these issues and keep this one for the long haul. :(
    2010 Black Silverado 5.3L/6 sp
    20" chromies
    moonroof
    power rear window
    :grrrrrr:

  2. #2
    Legend


    mfleetwood's Avatar
    Join Date
    Jul 2010
    Location
    Denver, CO
    Posts
    7,213
    Blog Entries
    1

    Default

    Double thread...Mod, please remove.
    Last edited by mfleetwood; 02-22-2012 at 11:05 AM.


    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;
    TIRES:
    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

  3. #3

    Default

    Quote Originally Posted by SoCalSilverodder View Post
    I have a 2010 crew 4x2 silverado 5.3 with the AFM, 29k miles. Some issues y'all can hopefully help me out with:

    1) I get 15.5 mpg according to DIC regardless of highway or city. I baby it to death and I have a very light foot. Is this normal mpg?
    2) It shifts in and out of 4 cyl mode constantly in traffic under 35 mph and sometimes I have to depress the accelerator 1/4 down to get it to go back to 8 cyl. On occassion, when it switches, it makes a chunking noise. I can only explain the sound like going over a cattle grate at highway speed (I live in SoCAl now but grew up in the country, hehehe). Are these normal conditions for the AFM?
    3) When Im at part throttle, I hear a buzzing sound from under the dash or in the tranny tunnel. It goes away when I ease up on the throttle and/or accelerate harder. Any suggestion where this might be coming from?

    I had an 07 with zero issues and 18 mpg. Traded in hoping for a better experience.

    Please help with your comments and suggestions and hopefully I can solve these issues and keep this one for the long haul. :(


    what does your dealer say?
    it should be a warrantable check
    2010 Chevy Silverado Z71 ext cab.4x4
    72 Monte Carlo 350-415 hp- sold (June 2011) to pay medical bills
    79 Impala 350 4bbl 375 hp- sold (June 2011)to pay medical bills
    oldfart2413@gmail.com

    "If He asks you to go a mile go two"

Similar Threads

  1. Issues with battery being drained--do these symptoms sound like a bad battery?
    By jbeall in forum General Chevy & GM Tech Questions
    Replies: 6
    Last: 05-11-2014, 08:28 PM
  2. Strange noise on new silverado 1500 4wd
    By SMTXAGGIE in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 10
    Last: 08-31-2011, 01:57 PM
  3. Center support bearing symptoms when bad
    By Jaceracer in forum GM Powertrain
    Replies: 3
    Last: 08-12-2011, 09:07 AM
  4. Replies: 4
    Last: 08-18-2010, 11:03 PM
  5. Symptoms of a fautly distributor pickup coil?
    By Alchemist in forum GM Powertrain
    Replies: 5
    Last: 09-03-2009, 11:25 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
  •