Edited by elchilero53, 17 July 2017 - 07:28 PM.
Another New Member From Texas
Posted 17 July 2017 - 07:24 PM
- scott19677 likes this
Posted 18 July 2017 - 07:55 AM
Welcome, always good to see another Texas on here.
2015 Deep Ocean Blue Metallic Silverado CC LT All Star Edition | See my build thread for list of mods so far | http://www.gm-trucks.com/forums/topic/199547-15bluesilverados-15-deep-ocean-blue-cc-lt/
Posted 11 August 2017 - 11:36 AM
Out of the break-in period now and this Silverado is getting 21.1 mpg averaged over the last 1780 miles. A friend has a 2016 with the same engine and tranny and he is grumbling about averaging 17 mpg. His wife said "you'd do better, dear, if you didn't have a lead foot!". He can't stand dawdling around so he drives like a wanted desperado being chased by the police. Serves him right.
Edited by elchilero53, 11 August 2017 - 11:37 AM.
- elementaltoad likes this
Posted 11 August 2017 - 05:39 PM
I have the same issues at times, it is hard to resist putting your foot into it a bit. We still average about 19mpg with mostly city driving, so I can't complain too much. It's a far cry better than our old 318 Dakota that gets about 13mpg! I was able to get 23.6mpg out of it on a long highway trip though. I'll still likely disabled AFM and replace the lifters when the warranty is up...I just don't trust those AFM lifters as many of them I have heard about collapsing. I love the technology on this truck, but some of the sacrifices in reliability they have made are a little silly, all in order to make small improvements in MPG on a TRUCK. I love saving fuel and money as much as the next guy, but being stranded because of a failed lifter will cost a lot more - especially out in BFE, and right outside of the warranty period.
Posted 12 August 2017 - 10:28 AM
Ahem, back to the thread discussion. From what I have researched, the AFM lifter failure seems confined to the Vortec 5.3L. I haven't encountered anything about this in my research on the 5.3L Ecotec3 or the 6.2 Ecotec3 motors - yet. I'm still looking. One thing I have found is that to eliminate the AFM in the motor requires some interesting modifications, not just simple reprogramming (new lifters, rods, crank shaft, reprogrammed tranny & ECM, etc.) that will void any warranty you still have. I purchased a full 100,000 mile bumper-to-bumper warranty with road-side assistance for this truck new truck just like I had on my Tahoe, so if something goes wrong or fails, the only cost on repairs to me is $100. Everything else is covered. Now, the 2014 Tahoe I sold had the Vortec 5.3L. It had lifter noise when cold that cleared up when I shifted from Pennzoil semi-synthetic to Valvoline semi-synthetic. After that, no more typewriters under the hood. Collapsing AFM lifters? Probably not but you never know. Still doing research.
Posted 12 August 2017 - 05:50 PM
- elementaltoad likes this
Posted 12 August 2017 - 11:04 PM
Right, it does seems rare enough that it's certainly not a priority enough for me to want to void my warranty. The first order of business after the warranty period is digging in with HPtuners to get the trans working like I want it. At that point I may want to put a small cam in anyhow, and it's a good time for AFM delete, new headgaskets, ARP headbolts, and all that good stuff...if I plan to keep the truck long term. I see a number of reviews and quality concerns that make these trucks seem like they are not intended to "go the distance" either due to complexity or designed service life. Those are usually my first mods being a mechanically inclined gearhead, none of my stuff is fast, but they are all bullet proof. The old TBI 350 Yukon GT has 255k miles on it, can't beat that for simplicity unless you manage to find a good 12v Cummins, or run a carb'd gasser.
I'm with you on those smaller displacement underdog motors too, while Dodge never really had a great OD transmission, the 3 speed TF held up well and the motors are just as reliable as the tried and true SBC. I also still have a little Plymouth valiant! 318, auto, factory AC car. It needs a lot of work to knock the ugly off, but it's a neat little car.
Posted 14 August 2017 - 08:46 PM
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