sunsalem

Sorry to hear.
Without a warranty, a used car can be a nightmare experience.

ncstingray

I have had two catastrophic engine failures due to the AFM. It is the lifter design that is the weak link. Once a lifter sticks or the spring malfunctions it creates a snowball effect. The mechanic at my dealer said that is primarily all he does is the repairs on GM AFM issues.

LT1pwrd'94

I have remainder of powertrain warranty, and purchased an extended 3rd party warranty. Service guy at dealer told me that extended warranty company won't deal with engine issues/failure if car is still under factory powertrain warranty. Anyone know if this is true?

Foosh

Yes, that is true.

NSC5

That is true, the extended warranty pricing is based upon additional coverage provided (i.e. 3rd party warranty company exposure) above and beyond all existing factory warranty coverage.

This also allows the extended warranty company to easily exclude powertrain coverage when a factory block is put into place because of modifications. If any of the underlying (factory) warranty is blocked or voided then the corresponding parts of the extended warranty are also useless.

sunsalem

YIKES!

OK, I didn't realize you were still under warranty.
You should come out of this alright.

Foosh

His primary concern is that he has headers, high-flow cats, and a CAI. Most cars with headers have been tuned at some point as well, which is usually necessary to derive the extra output available from headers, but that appears to be unclear in this case. If it has been tuned and flashed back to stock, the fingerprints will still be found.

I'm sure all the above is under evaluation w/ GM involved.

ExRedRacer

So by deactivating 4 cylinders in the AFM mode, those 4 inactive associated lifters and springs can get stuck? Is that the problem you had?

I just want to be clear on this. And to be doubly sure I activate my Range device after every start-up.

cv67

Red Devil

Might have been better to take it to a 3rd party Corvette specialist to find out what the problem is and if necessary remove the aftermarket parts and then take it to GM. If something like a bad tune caused the failure then you have to suck it up and rebuild.

Jstan2014

Good luck to you, sir. I’m eager to hear the outcome. My 2012 A6 Grand Sport came with a 90 day 3K mile limited warranty from the small lot that I bought it from. I hope your situation isn’t too bad. ( for various reasons, I won’t purchase another Vette from a small lot again unless they specialize in Corvettes and/or performance vehicles). Corvette World in Dallas always has very nice low mileage Corvettes.
Joe

red62vette

Yikes is right. I had my car out this morning and I just drove it without Eco mode. It’s a stick, so it won’t go into V4 this way. My mileage without AFM at 73 MPH was 26 MPG anyway, which is good enough for me. But now I’m worried about my wife’s 15 Tahoe. At least that car has a 100k Powertrain warranty.

bluman

Reason why I don't use that ECO bull, it's a sports car, I didn't purchase to run in V4 and I don't care about the measly 2 mpg savings i would get !

OP, hope all turns out well for you !

braveheart3158

I would never buy a Vette that had been sold at auction. IMO thats where all the cars go that nobody wants. Second, I would also not buy from a Used car dealer.
I am sorry for your loss. Thats a hard lesson.

449er

Cmon man! A "modified" car? Jeez, headers & a X pipe aren't going to cause an engine to grenade

phileaglesfan

Has the engine been tuned? I'm guessing yes with the headers. Good luck with GM but they shouldn't be expected to pay for someone else's screw up.

If you bought it at an auction then you might be paying for it since they are usually "as-is".

Foosh

Since the OP just purchased this car, I'm pretty sure he doesn't have the full history on the car. You can argue until you're blue in the face about what would and would not cause an engine to grenade, but certain modifications will cause a warranty block and no amount of fighting it is going to be cost-effective.

DanZR1

Apples and Oranges, but...

I'm a Harley guy. If you do intake and exhaust mods on a Harley, you Must do a tune or it will run way too lean, and almost certainly cause issues. The stock HD tune and O2 sensors can't compensate for the increased air flow.

Is this not true on a C7 as well, or can the ECM compensate for it?

Foosh

The ECM will compensate, but I'm told you can end up with less power as a result without a tune.

DanZR1

Thanks Foosh. It always amazes me that folks will mod intake and exhaust, and not do a tune, be it GM or HD. Why pay all that money for parts, and not get a decent tune to get the most out of those parts. There's 1000 posts on every HD page, "I changed my pipes, do I need a tune?"