Mark230

Picked up my 2018 GS in August and was having a blast with the car (daily driver).

However a couple weeks back I noticed a rattling noise coming from under the car once the RPM's reached between 3,000 to 4,000. Basically before the auto transmission would shift to the next gear, it would make a loud rattling noise. My guess was I might have gone over a speed bump to fast and maybe damaged he heat shield...boy was I wrong.

I took it to the Chevy dealer and after a few days of testing, Chevy informed me that #7 & #8 cylinders spun a rod bearing and they were contacting GM to either repair or replace engine. GM advised to replace the engine so now I'm waiting for the new engine to be shipped and installed. The car had less than 4,000 miles.

I never took the car to the track, nor have I ever modified anything to the engine. I did accelerate hard every so often on the highways, however nothing compared to a tracked car. My guess is that me accelerating hard a few times a day should be nothing for a GS.

Anyone ever experience a similar situation (hopefully not)?

Going to chalk this up to a defect from the factory, and eagerly waiting for the new engine to get installed so I can continue enjoying the car!

Thanks,

Mark

SoFloVette

If accelerating hard caused #7 & 8 rods to spin. I'm doomed! I drive my car, and I drive it hard. Only 1,100 miles on it.

oregonsharkman

Definitely a defect in the engine build. With a stock tune, an LT1 would be happy living it's entire life with the accelerator floored.

flying_vette

Phanni

A buddy of mine had a similar failure with his 2015. They rebuilt his engine, and it now runs great.

jimmbbo

Absolutely a defective engine... Please post the findings

FYI, "Both the crankshaft and connecting rods ride on all new Polymer Coated Bi-metal eccentric bearings, which have passed GM's grueling testing, including the brutal "hot scuff" test, in which a brand new, never fired engine is run at wide-open throttle with zero break-in period. In fact, all of GM's testing is brutal, with the Gen 5 LT1 completing the equivalent of over 1.5 million miles of validation testing. "
http://www.superchevy.com/news/ghtp-...1-small-block/

GoatHead

The cars are engineered to be driven hard. It must be defective engine from factory/

AORoads

I was gonna ask, "Did you break in the engine?" But, after reading. "...a brand new, never fired engine is run at wide-open throttle with zero break-in period." I thought it musta been a bad, bad engine.

spinkick

I always wonder why we get these 1 million mile tests why our cars dont get that many

itch808

Ever checked the oil level? My guess is a low fill, drop in oil pressure and spun bearings.

Zjoe6

Yeah was there oil in it? Kidding!!!!

Sorry for your hardship..

Dave80C3

The cars at Spring Mountain Corvette Owners School, spend a whole lot of time 4000 to 6000 RPM each day of class, which is 5 days a week.

You just got the rare defective engine.

Mark230

Thanks for the all the feedback.

Will provide an update once I get the car back and will post some pics with the new engine!

Mayor111

- Just thinking out loud...but you might want to force them to rebuild rather than replace. The value of the car may really tank if you go to sell it one day and have to disclose it has a new engine. I dont care if Mother Teresa is the owner...once you tell me it has a new engine...the deal is off. Others may feel the same way...not sure.

To me - engine "rebuild" could mean you just had some problems - but engine "replaced" means you beat the heck out of it and needed major work to fix it... Again this is just my perception...others here can weigh in..

Regardless I hope everything works out to your benefit!

Mark230

Thanks for rebuild thought...the car is actually a lease therefore no issue.

I was considering buying at the end of the lease, however now I will return and look at other options.

JALLEN4

I think you will have a very difficult time "forcing" GM to do anything but it seems many on this forum disagree without basis. In other threads on this forum there have been long arguments about the merits of shop rebuild vs replacement engine. The consensus seemed to be in those threads the dealer lacked both knowledge and facility to properly do the job. Something I disagree with. From experience, in the real world, it would be a coin flip on either solution or whether either solution made one bit of difference at resale,

Foosh

Situations like this are examples of what is known as "infant mortality" in manufacturing. Components and systems have a higher probability of failure at the beginning of their life cycle, and, of course, at the end, when components start wearing out. Infant mortality is indeed rare. Once an engine has been well-broken in, chances are it will make to the high mileage club if it is well-maintained and not abused.

Mayor111

No disagreement - My thought when saying "force" is that GM may rebuild the engine cause its less expensive overall to THEM than if they provided a new engine (Im assuming the rebuild would be cheaper).

However, now that I hear its a lease - then it really doesn't matter since its THEIR car in the end.

JDSC8VETTE

I had a 2013 Cadillac ATS 2.0 turbo that the engine blew with 19,000 miles on it. GM installed a new engine but I kept getting check engine codes. After about 3 trips back to the dealer GM offered me a brand new car. I got a brand new 14 and they even waived the mileage penalty.
I don't think GM would allow an engine to be rebuilt. They will definitely sent out a new engine.

rmorin1249

Personally, I would rather get a new crate engine than having the original engine rebuilt. At any rate, hope it turns out great for you. I would chalk it up to bad luck.