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02-22-2012, 09:10 AM #1
- Join Date
- Nov 2010
- Bellflower, CA
2010 Silverado with strange symptomsI 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
power rear window
02-22-2012, 11:58 AM #2
- Join Date
- Jul 2010
- Denver, CO
- Blog Entries
Double thread...Mod, please remove.
Last edited by mfleetwood; 02-22-2012 at 12:05 PM.
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
02-25-2012, 09:07 PM #32010 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
"If He asks you to go a mile go two"
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