New service bulletin-2020 GM V8 motor valve spring issues.

Val Walkinshaw · 09-24-2020, 11:31 PM

https://gmauthority.com/blog/2020/09...gm-v8-engines/

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.”

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.

UnknownJinX · 09-24-2020, 11:45 PM

So I am assuming it's a bad batch, then?

Val Walkinshaw · 09-24-2020, 11:48 PM

Is this the suppliers version of car covid?

2SS Capt · 09-25-2020, 12:23 AM

Glad my 2020 2SS was built last December...

UnknownJinX · 09-25-2020, 12:30 AM

Quote:

Originally Posted by Val Walkinshaw

Is this the suppliers version of car covid?

At least it's not as bad as the Subaru and Mazda diesel valve spring recalls, which are more of a design issue than a supplier issue.

LT4Greg · 09-25-2020, 06:58 AM

Reminds me of my 2010 2SS with the LS3 and the broken valve spring I had replaced under warranty in 2012! Come on GM, stop putting inferior parts in the engines now!

Orangeman13 · 09-25-2020, 07:28 AM

so if our car was built in July 2020 should I take it in to the dealership today?

LT4Greg · 09-25-2020, 07:37 AM

Orangeman, I would contact your dealer and talk to the Service advisor or Service Manager and ask them about this news and they will advise you. Don’t panic!��

Petrol Head · 09-25-2020, 07:51 AM

The real question is HOW did the batch become faulty? They're the same springs that have been on every LT1 in both Camaro and Corvette since C7 LT1 production started for the 2014 model year. What did the factory do differently in the production process?

LT4Greg · 09-25-2020, 08:00 AM

Yeah I agree with that Petrol Head. Could be that GM used a different part manufacturer which was cheaper than before or other factors causing the problems. My ZL1 LT4 maybe a ticking timebomb waiting to go off due to some LT4s having defective oil pumps and for that reason mine will stay stock until the drivetrain warranty is up.

Venomcustom · 09-25-2020, 08:25 AM

My car was built in July. I’m going to call the dealer today and see what they have to say. I’ll report back.

mikeman · 09-25-2020, 09:01 AM

The new C8 seems to be having a big problem with this. More than a few cars over on the Corvette Forum reporting issues with cracked valve springs.

Also, it seems if this problem develops, it happens early like within the first hundred or so miles of ownership. So, I think if you already have a thousand or more miles, you're probably safe from having the cracked valve spring issue.

Thill444 · 09-25-2020, 09:52 AM

Quote:

Originally Posted by Venomcustom

My car was built in July. I’m going to call the dealer today and see what they have to say. I’ll report back.

Mine was also built in July. Let me know what they say. Obviously I have any engine issues/codes/faults I will stop driving and make the dealer aware, but if there is something we can do proactively would be good to know.

I am just under 500 miles, many of the C8's I have seen with the valve spring issues seemed to have issues under 100 miles, but who knows.

Venomcustom · 09-25-2020, 10:03 AM

Quote:

Originally Posted by Thill444

Mine was also built in July. Let me know what they say. Obviously I have any engine issues/codes/faults I will stop driving and make the dealer aware, but if there is something we can do proactively would be good to know.

I am just under 500 miles, many of the C8's I have seen with the valve spring issues seemed to have issues under 100 miles, but who knows.

Same here. I have 430 miles on the car.

09-24-2020, 11:31 PM	#1
Val Walkinshaw L8ap3x Drives: 2018 2SS 1LE Join Date: Jun 2018 Location: SE MI/ NW OH Posts: 429 View My Garage	New service bulletin-2020 GM V8 motor valve spring issues. https://gmauthority.com/blog/2020/09...gm-v8-engines/ 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.” 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.

09-24-2020, 11:45 PM	#2
UnknownJinX Drives: 19 Chevrolet Camaro 2SS 1LE Shock Join Date: Apr 2020 Location: BC, Canada Posts: 1,947	So I am assuming it's a bad batch, then? __________________ Current: 2019 Chevrolet Camaro 2SS 1LE M6 Shock GM Performance Intake and that's it, because driver mods before car mods Past: 2009 Mazda RX-8 GT M6 Velocity Red Mica (Sold) 2015 Chevrolet Corvette Z51 2LT M7 Velocity Yellow Tintcoat (Flood totaled)

09-25-2020, 12:23 AM	#4
2SS Capt 2020 Shadow Gray 2SS Drives: 2020 2SS - A10, NPP, MRC, CAI Join Date: Dec 2019 Location: SoCal Posts: 3,028	Glad my 2020 2SS was built last December... __________________ 2020 SGM 2SS - A10, NPP, MRC, Red Calipers, Black Camaro Fender Badge, Footwell Lighting *Added after delivery:* - GMP CAI, GMP Black Strut Tower Brace, MRR017 1LE Wheels, SS Armrest, Black Fuel Door, Stainless Sport Pedals, SS Wheel Caps, Black Lugs/Locks, GM Splash Guards, DD Smoked LED Markers, Smoked Rear Reflectors, Mishimoto Catch Can, Xpel PPF - Full Front, SunTek 35% Tint, CeramicPro coating, RST Stainless Brake Lines, Castrol SRF, MSD Super Conductor Wires *Left: My "fun" ride. Right: My "work" ride: a Gulfstream G600. One's top speed is 180 Mph, the other, 620 Mph...*

09-25-2020, 06:58 AM	#6
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	Reminds me of my 2010 2SS with the LS3 and the broken valve spring I had replaced under warranty in 2012! Come on GM, stop putting inferior parts in the engines now! __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

09-25-2020, 07:37 AM	#8
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	Orangeman, I would contact your dealer and talk to the Service advisor or Service Manager and ask them about this news and they will advise you. Don’t panic!�� __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

09-24-2020, 11:48 PM	#3
Val Walkinshaw L8ap3x Drives: 2018 2SS 1LE Join Date: Jun 2018 Location: SE MI/ NW OH Posts: 429 View My Garage	Is this the suppliers version of car covid?

09-25-2020, 07:28 AM	#7
Orangeman13 Drives: 2023 Black Camaro 2SS Join Date: Sep 2017 Location: Cincinnati Posts: 259	so if our car was built in July 2020 should I take it in to the dealership today?

09-25-2020, 07:51 AM	#9
Petrol Head Account Suspended Drives: Fast if no one's looking Join Date: Aug 2019 Location: Cleveland, Ohio Posts: 1,794	The real question is HOW did the batch become faulty? They're the same springs that have been on every LT1 in both Camaro and Corvette since C7 LT1 production started for the 2014 model year. What did the factory do differently in the production process?

09-25-2020, 08:00 AM	#10
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	Yeah I agree with that Petrol Head. Could be that GM used a different part manufacturer which was cheaper than before or other factors causing the problems. My ZL1 LT4 maybe a ticking timebomb waiting to go off due to some LT4s having defective oil pumps and for that reason mine will stay stock until the drivetrain warranty is up. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

09-25-2020, 08:25 AM	#11
Venomcustom Hard to want. Drives: 2020 red hot 1SS 1LE Join Date: Aug 2017 Location: Nashville Tennessee Posts: 527	My car was built in July. I’m going to call the dealer today and see what they have to say. I’ll report back.

09-25-2020, 09:01 AM	#12
mikeman Banned Drives: 2015 Camaro Join Date: Aug 2018 Location: My Garage Posts: 1,125	The new C8 seems to be having a big problem with this. More than a few cars over on the Corvette Forum reporting issues with cracked valve springs. Also, it seems if this problem develops, it happens early like within the first hundred or so miles of ownership. So, I think if you already have a thousand or more miles, you're probably safe from having the cracked valve spring issue.

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