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I have a 2015 A8 with NPP base model. Fabulous car. Great low end torque, perfect for the street. What made the car for me was disabling the AFM.
It amazes me when other owners say they do not know or feel the cylinder deactivation process. I wish the automatic cars had the same option perimeters as the stick shift cars. Only in Eco for AFM would be a great improvement!!!!!!
Had my 2017 z51 for about 5 months now. Absolutely love it. Last week its nav screen failed, took it to dealership and now i am waiting for parts. i discovered from this forum that oil change is required for Z51 after first 500 miles. Dealership was counting it as one of the 2 free oil changes that GM does. i have to clarify it again.
One thing i wanted to highlight was the fuel. not sure what fuel dealer was using in teh car, it was very rough on delivery. As a courtesy they filled gas for me when i went back for regn plate and also for some checks. Ofcourse, i thought that's how the car runs as its "performance". Once i shifted to my choice of gas which is Shell, things changed and now .. wow the engine is smooth like butter. Power is abundant and engine doesnt scream anymore for mercy...
i did try Costco gas and also other brands like Chevron.. but for me, Shell seems to be the best solution ... if you haven't give it a try and i hope you will see difference before you go for the next fillup.
I was all set to purchase a new C7 until I started reading about the problems the 2014 to 2016 cars are experiencing, specifically, in cabin electrical issues and engine problems that result in engines freezing up due to metal shards in the oil from poor milling process and Z06 engine overheating, are these infact real issues? I read that GM is replacing the engines under warranty and they are requiring oil change in first 500 miles, but what happens if the engine goes bad after the 4 year power train warranty is up and you have low miles on your car. ( which is pretty normal since most owners don't use there cars for daily drivers, this will be one very expensive out of pocket repair). Why did GM reduce there power train warranty on the 2016 C7s to 4 years/60,000 from the 20014, 2015 C7s 5 years/100,000, in my opinion this is suspicious when you consider engine and other issues. In final, am I being to paranoid and would you feel comfortable laying out $65k to $80K under the present circumstances? Looking forward to feedback, Thanks, C7 Wantabe owner.
my 2015 z06 after one year of purchased and abt 6k miles I had to take it for warranty, engine misfiring, turned out to be clogged injector on cyl #6, dealer replaced all four injectors in that bank and everything was back to normal... I had to take it to the dealer again due to road debris puncturing my super charger heat exchanger resulting in a leak, but that was covered also with no cost....Yes I will buy this car again if I have to do it over..... best car ever owned and driven, although my 93 rx7fd its right below it
These cars are solid, feel well built, seem to love being driven hard, engines problems are way blow out of proportion. Buy one today and you will love it.
Right now there isnt a car thats better looking and faster for the money. its one of the best values.
I plan on selling mine in a few years because i honestly dont feel this car is going to last for years. The engine has the flawed GDI design, AFM, and electric diff (Z51).
My 2008 CTS had the 3.6 GDI (first generation of this GDI engine) and it was still running flawlessly and getting the same MPG as it did originally when I traded it in with 68K miles. I replaced it with a 2014 ATS with the second generation GDI which picked up a few horsepower over the original. There are some flawed GDI engine designs but GDI itself is a very good and useful technology.
How did you disable the AFM?
Does that affect warranty?
Dave
With the Trifecta tune (AFM is retained in Eco mode). Yes, it would void the warranty, if discovered. The stock tune can be re-loaded for a warrant repairs.
My '14 Z51 at 30K overheated while on a traffic jam, I immediately stopped it and towed to closest dealership, fan and water pump replaced under warranty. One week at the shop. Now at 33K is back again for another week, because of AFM failure (detected after slight random noise coming from engine compartment), now engine head removed and lifters beign replaced under warranty. LT1 doesn't seem to be a dependable engine has poor quality control.
Direct injection motors have issues across the manufacture's spectrum with respect to carbon build up on valves.
My E90 ('07-'10'ish) BMW forums have stories of folks doing 'walnut blasting' (google it) on direct injection motors with as few as 20-30K miles. There are some pretty gnarly pics out there of valves that have so much carbon on them that the valve stem looks like a 'blob'.
I've read about the same issues on the CTS forums.
When the detergent in the gasoline no longer can clean your valves (because the intake tract is now dry, instead of wet) what can you expect?
Sounds like the OEMs need to install factory meth injection on our DI cars!
What they need is to install port injection along the GDI system for the valves to be able to clean themselves (Ford and others manufacturers are going toward that direction). And alsoto don't include the prone failure AFM system ( the one which switchs your V8 to V4 ).
We are buying sport cars not civics. The more technological complex the machine the more prone to fail.I already experienced that on my C7, never had an issue like that on any of my previous vehicles. They want to improve MPG but what about their Quality control, we want cars that will last longer.
There are no LT1 issues whatsoever, there were a few early LT1 failures, but there are no issues with the bulitt proof LT1. Camaro has had no issues either with the LT1.
GM did a great job engineering the crankcase ventilation system on the LT engines. Leaps & bounds ahead of the early DI engines, especially the BMW's. I'm @ 41k miles on my 2014 Z51, have had my intake manifold off numerous times while swapping various ported manifolds, and do not have any signs of even the slightest amount of build-up.
02-12-2017, 10:47 AM
LT1 doesn't seem to be a dependable engine has poor quality control.
