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04-08-2011, 11:05 AM #1
- Join Date
- Dec 2010
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
04-09-2011, 09:35 PM #2
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
04-28-2012, 02:23 PM #3
- Join Date
- Mar 2009
- Ontario Canada
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 02:32 PM.2010 Silverado LT 4x4 5.3L Ext Cab
05-06-2012, 09:49 PM #4
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
- Join Date
- May 2012
- Corpus Christi
05-09-2012, 01:12 AM #5
Some distributors(one out of the 8) like to tick, does it do it when it's not in gear? Give it a listen.
2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax 6.5" BDS Suspension Lift Key'd to 9" Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case EFI Live Comp Cam and Valvetrain Snow Performance Methanol Injection 35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires PPE Tuner until i tune it with my EFI Live Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder Leveling kit & 34.5" Nitto Grapplers 18" XD Rims Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light BDS Dual Steering Stabilizers Pioneer Double-DIN Touchscreen Navigation with Two 10" Subs under rear seat Electric Fan Autometer Pressure, Boost, and Pyro Gauges 4.56 Gears AFE Stage 2 Intake
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