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  1. #1

    Default 5.3l afm engine tick--not the typical lifter tick @ cold start

    2010 5.3 Silverado, w/ 6 speed and AFM. ~20,000MILES

    The truck drives smooth and no ticking in general. But when it drops to its lower gears, near 1000-1200rpms, and you apply light throttle/load, you can hear some ticking just for a second. Usually then the tranny downshifts, rpms rise, and it goes away.

    I have checked the exhaust, no problems there.

    I have checked the lifters/valves at dealership, no problems there. This is not the typical lifter tick at startup!

    I have been told it could be sound, resonating through the exhaust as the engine lugs....or it could even be the fuel injectors firing? Anyone confirm this? Anyone with the same truck hear this on the drivers side?

    Your help is greatly appreciate. Thanks

  2. #2
    Sr. Engineer
    Join Date
    Oct 2010
    Location
    Indianapolis, In
    Posts
    493

    Default

    Could be slight ignition knock and when sensed it downshifts to aleviate the condition. Try a tank of premium gas next time and see if it improves or goes away. If it does then maybe program issue in computer.
    2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear

  3. #3
    Jr. Apprentice
    Join Date
    Mar 2009
    Location
    Ontario Canada
    Posts
    21

    Default

    I have the same issue with my 2010, dealer told me that it was due to the AFM. my 2007 never had this issue, it is suposedly a well know service department complaint that stems from a few different things.07 had a 3.73 rear, 4 speed. The 10 has 3.42, 6speed they left alot to be disired in the synching of the gears in my mind. The fuel reduction was not enough in the first generations of the AFM, so they now try to maintain the V4 mode longer than the first generations, resulting in the vibration (again told it is the exhaust resonating through the system) and the sloppy spiratic shifts in low throttle scenarios.I would like it all disabled by GM, let the owner decide if they want tp "save" fuel, i think it is an emissions spoof myself, my 10 if anything is worse than my 07
    Last edited by squires; 04-28-2012 at 01:32 PM.
    2010 Silverado LT 4x4 5.3L Ext Cab

  4. #4
    Sr. Apprentice
    Join Date
    May 2012
    Location
    Corpus Christi
    Posts
    30

    Default

    Quote Originally Posted by squires View Post
    I have the same issue with my 2010, dealer told me that it was due to the AFM. my 2007 never had this issue, it is suposedly a well know service department complaint that stems from a few different things.07 had a 3.73 rear, 4 speed. The 10 has 3.42, 6speed they left alot to be disired in the synching of the gears in my mind. The fuel reduction was not enough in the first generations of the AFM, so they now try to maintain the V4 mode longer than the first generations, resulting in the vibration (again told it is the exhaust resonating through the system) and the sloppy spiratic shifts in low throttle scenarios.I would like it all disabled by GM, let the owner decide if they want tp "save" fuel, i think it is an emissions spoof myself, my 10 if anything is worse than my 07
    All true.Problem is getting Gm to acknowledge it. And,that ain't gonna happen. Id like to see an honest poll of how many consumers weren't aware of the cylinder unloading feature of the 5.3 AFM before purchasing it. Of course noone wants to come across as being an unwary consumer so some may say they were but in reality were not aware of it.The sales people sure don't push the issue much and nowhere on the window sticker does it elude to anything except the letters AFM,which mean nothing to most consumers unless they did some homework first. In my opinion the whole inception of the AFM is sort of a don't ask don't tell policy of sorts. Too bad GM felt obligated to butcher such a nice powerplant as the 5.3. Heck,they were selling Colorados with the 5.3 option without AFM. Go figure.
    2012 silver ice metallic Silverado CC 4X4 /6.2L / 373/9.5" rear max trailering package/ 18" Z71 rims with 285/65/18 BFG TA/KO Ebony leather interior / 2011 grill insert with black mesh/rear fender liners and bed rail protectors/ Z71 skid plates/GM bed mat/2" billet aluminum under strut front leveling kit

  5. #5

    Default

    Some distributors(one out of the 8) like to tick, does it do it when it's not in gear? Give it a listen.
    www.youtube.com/ippielb
    2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax
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