New Service Bulletin Addresses Valve Spring Issues In GM V8 Engines
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General Motors has issued a new service bulletin to address the valve spring issues some of its newer V8 engines are experiencing.
GM LT2 V8
The service bulletin indicates that vehicles equipped with certain GM V8 engines may produce a service engine light along with a misfire and strange engine noise. The issues can be linked back to faulty valve springs, with the bulletin instructing the service department to check for a broken valve spring and, if necessary, perform a cylinder leakage test on the cylinder with the broken spring. The bulletin also says that “if no cylinder leakage is observed it will be necessary to replace all valve springs on both banks if the vehicle is built between June 1, 2020 to September 15, 2020.”
GM L8T V8
The bulletin also indicates that the above fix only applies to the following 6.2L GM V8 engines: L87, LT1, LT2 and LT4. For all other current GM V8 engine RPOs (L82, L84 and L8T), the service department is instructed to “just replace the affected valve spring,” and that if they determine there is a cylinder leakage, it “will be necessary to inspect further to determine the extent of the engine damage to determine correct repair required.” GM is also requesting that the service department send back valve springs from affected engines for further inspection.
GM L82 V8
This service bulletin can affect a very large range of current GM vehicles. The LT1 and LT4 V8s are found in the Chevrolet Camaro, while the LT2 V8 powers the Chevrolet Corvette. The L82 and L87 V8s are found in the latest GM full-size truck and SUV models, while the L8T is offered in the Chevrolet Silverado HD and GMC Sierra HD trucks, along with the Chevrolet Express van.
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what a turd
GM has been building v8 engines for decades. Many of those some of the best v8s ever made. But to produce an engine with bad valve springs! That is completely unacceptable. That’s absolutely nothing but complete incompetance.
This seems like a supplier issue – testing every part from every supplier to confirm it conforms to the spec isn’t realistic, vehicles are expensive enough. It’s a tough spot to be in.
All new Shipments should go through QC.
All vendor shipments must be randomly tested!
Probably a vendor supplied part. Ironic, but I had a valve spring break in a 2013 Ford F-250 6.2L last week. Ford probably bought theirs at the same place…..
This failure alot more common on GM products opposed to ford there are alot more ford trucks on the road than gm chevy and cmc combined and its not that big of an issue on ford trucks and it usaully happens over 100000 miles not like gm some at 40000 some at 70000 miles
Hire a shmuk to sit and. a grad e valve springs is called quality control 🤣🤭
Hire as shmuk , to sit and grade valve springits called quality I control mys,
Even a Shmuk knows even testing them will not always find a future failure.
This is far from the first supplier spring failure in the industry and it’s not the last.
C8 is working to be supercar status. Has porsche,ferrari,Lamborghini, mclaren had these problems. Let’s hope the 5.5l will have better quality control.
You get what you pay for, the vehicles you mentioned cost quite a bit more !
$80K is a lot of money to a lot of C8 Buyers. The other models purchasers have no cares about price. Therefore the smaller buyer is much more affected by QC.
Obvious don’t know any Ferrari or Lamborghini owners
Love the 35000 mile Ferrari engine out have a C5 with 180000 and no internal engine issues just normal alternator water pump replacements after 110000
What a price of Crap
Oh my c8 just went from bowing green down rte 66 on to Vegas and Bellagio (bell hops loved seeing new vette)
A friend of mine had to have broken valve springs changed in his Lambo… Not sure what year but I doubt it’s more than 3 years old.
Have the other super car companies suffered similar issues? Yes.
Ferrari for years has had the 30k mile service that required a number of models to replace timing belts at this low mileage or they bend every valve in the engine. They also usually needed new ball joints etc.
Lamborghini for years has been a car that needs tons of care and was well know for failure of various parts. Mclaren gets engine from others.
Valve springs have always been an issue in a number of cars. They are made by suppliers and can not be tested for failure unless they are weak to start with.
In NASCAR they test the best springs money can buy. They change them weekly and yet they still find bad ones the hard way.
C8R,
You make it sound like valve springs are made out of recycled beer cans. I have two vehicles in my driveway. One with 225K and the other with 650K all original. They both run perfectly. I wonder how close they are from original specs.
Ccainc
Those other supercar companies have WORSE Problems. I can tell you have Never owned a Ferrari!
Still no reason to have these on a truck motor like the 6.2L…..mine broke at 750 MILES!! Crap!
Too Tall
Anyone GM owner want to buy my 2020 Toyota Tundra?
I’ll discount the sale since there was a recall on a light bulb.😅
Nothing new; it happens. I had a ’79 Chev Police car with the same problem. At high speeds, the valves would float and lose power. The fix- Corvette valve springs.
You can not sort for this failure.. You need to fix the root cause at the supplier and scrap all the material in process.
Great quality control GM !!!
Went through this with the C5 Z06. Valve springs failing on many of the 2002 and 2003s, lots of engines damaged. Ended up replacing all of mine just to be safe
They only mention it affecting vehicles being built between June 1st & Sept 15th. Makes me wonder if any of those engines with issues are still in “staging” to be put in more new builds, or if they have done the “fix” to all of their V8’s in stock. It is disconcerting to me, since mine is “scheduled” to be built during the week of Oct 19th.
I also have C8 on order to be built in October or November. I seriously doubt that they have a 30 day supply of assembled engines. My guess is that our builds should be OK. Maybe we are the lucky ones!!
I bought a 2021 camaro ss, I had the valve springs go out at 800 miles and they put in a second motor in, it went bad in 1 day with only about 40 more miles. Now my third engine is being put in as we speak.
wow that sucks, but somehow you got GM off their ass and they are at least working with you. My question is this, and maybe you are fortunate enough to be able to buy the camaro without needing to finance it, but must you still make payments while it is sitting in the dealerships shop? that would make me a little ticked
I have been working with the Chevy Dealer in Lake City, FL and they have been very helpful and are keeping me well informed on every step of the way. I would recommend that dealership to anyone. I am also working with GM to see what kind of compensation they are going to give me. I love the car when it runs.
I have a 2015 Camaro 2ss LS3 with a blown valve spring, 150,000 miles. I was pulling into my driveway at low speeds/rpms and my engine blew. There is more of an issue here than just the 2020’s!
GM is back baby
When hundreds of thousands of items are being manufactured using hundreds of components from dozens of suppliers scattered all over the world, it is inevitable there are going to be a few problems. And considering the total number of vehicles built and sold in the world every year, it’s a miracle more such instances of problems don’t crop up.
As far as “checking” valve springs is concerned, there’s no way to do so after the fact regarding a spring’s future survivability potential; that is a product of the metallurgy survey involving the steel manufactured to be made into the wire to be made into springs.
I was gonna hold out for the last of the ICE Camaro, but that Dodge Challenger TA is looking better all the time.
Springs made in China will have improper heat treatment more frequently than made in the USA. For some strange reason the art of heat treatment eludes the Chinese mind.
Not true bad springs can happen anywhere for any reason.
First thing before a comment like this prove where they really are from. You may surprise yourself!
More Chinese sourced parts?????????
So all C8s now need engine work. The flagship????
If those springs are made in China, I hope gm has to replace every last one of them on their dime. I had to trade a perfectly good car because of a manufacturing problem from guess where? China. 2014 malibu 2.5 VVT oil control solenoid