Sorry to hear man, good luck

 

Keep us posted.... good luck

 

AFM: Active Fuel Management, another name for Variable displacement engine which is an automobile engine technology that allows the engine displacement to change, usually by deactivating cylinders, for improved fuel economy. The technology is primarily used in large, multi-cylinder engines. It started with infamous Caddy’s 4. 6. 8 V8 of the 80s.

The reason its mentioned here is simple it has a bad reputation and service people sometimes will blame the system for engine ills as describe here. But it should be noted the Variable Displacement is a strategy employed by almost all manufacturers. even Porsche is considering for some of its upcoming cars.

Being around when Cadillac came out with 4-6-8 engine the big issue was faux failures. The transition between modes was so clunky Caddy owners thought their engines were failing.

I advised a friend who just bought and A8 C7 to use manual mode during the break in period (AFM is all ways active in all but manual mode in an A8 and only active in ECO for the M7). That should tell you about my confidence in AFM.

It would be interesting to see the engine failures by transmission type. Since most of us M7 owners do not use AFM other than winning bets on HW MPG!

 

just an update broken valve spring,bent valve damaged piston and cracked valve guide, and all this at 25 mph. Dealer says they can only put 1 unbalanced piston and rod in and send the head out for repair.I have worked at a FORD dealership for 37 years and have never seen a single piston replaced on a modern engine, it is always a short or long block. After the the bad luck with my 15 a feel like GM is giving me the shaft.2 corvettes in 2 years with major problems I'm not real happy with general motors

 

As you, i've owned multiple new Vettes over the years. If this happened to me.... twice..... "not being happy with GM" would be an understatement.

Hope GM jumps on this and make things whole!

 

Service Manager called GM, and they say repair the head, and replace just 1 piston! Oh well.... I am not happy with how you treated me GM. Just hope your vette dosen't break a valve spring

 

I have a 2015 c7 broken Valve spring at 22000 miles only Goin 30mph luckily the Valve didn't drop..Iam debating either replacing all springs with upgraded or just get rid of the car..I don't trust the car anymore my 2010 Camaro l99 10 years not one issue traded for my bucket list dream car ..long story short can't afford a 20000 for a new motor in retirement!

 

Welcome to our forum raym74. So sorry to read about your broken valve spring. I know some members have gone the route of replacing all springs with upgraded ones. Keep us in the loop on your decision. Is yours non-Z?

 

I also had a broken valve spring on my 2016 Z06 at about 20k miles. Same thing--slow driving just happened. Only the spring was damaged, no damage to engine. Covered under an extended Chevy Protection Plan. No problems since, four years later and now at 30k miles. There is a farily detailed discussion of it with pictures at https://www.stingrayforums.com/threads/dead-z06.85858/?post_id=981599#post-981599. --Bob