GM LS 6.2 L86 Failure

[rivermobster]

Why? There are plenty of pushrod engines out there with considerably north of 1/2 a million on 'em....and they work just fine. Most of the shit I've owned I acquired with more than 150K miles already on it....usually put another 100 or so on 'em and then move on because my needs change. Can't say I've ever had an engine failure on one of my drivers....except for the cracked head on the old '96 4runner at 300 something thousand miles....but nothing's really surprising at that point in the game. It owed me nothing.

What needs to go away is low tension rings so that the crankcase stays full between oil changes and doesn't coke up and clog shit up. Then they'll run forever again, just like an old chevy.

Why?

Speaking as someone who has worked for both domestic and import car companies, pushrod engines are lame.

Lose all the valve train components and everything gets Way more compact and efficient.

The intake and exhaust valve angles can be whatever you want them to be. No restrictions whatsoever.

Intake and exhaust runners? Yep. Same thing. Overhead cam designs are the best.

Variable valve timing get infinitely easier to manage and control. Good luck with that on a pushrod engine. It's an absolute fucking nightmare that is prone to all kinna issues. Ask half of the LS owners.

BMW long ago learned how to control valve opening timing and lift with their overhead cam engines. They can idle at 500rpm with zero vibration and rev to almost 8k with ease.

Try that with a single cam pushrod engine. No Way is that gonna happen!

Pushrod engines had their place in the history books, and that's exactly where they belong.

 

[pronstar]

One thing to consider is packaging.

A 7.0L LS7 takes up less space than a 5L Coyote motor.

OHC engines can't get away from all that stuff atop the cylinder.

 

[rivermobster]

One thing to consider is packaging.

A 7.0L LS7 takes up less space than a 5L Coyote motor.

OHC engines can't get away from all that stuff atop the cylinder.

Makes you wonder how the imports did it then?

 

[Neverbowdown]

Do you build engines?

Or are you just taking the 'Muricah stance and feel reliability is somehow tied to not taking an Obama Bailout?

I posted facts, pertaining to the OP's issue. You didn't like my response to someone's brand quip.

Food for thought - you are now your on a political rant on the OP's thread.....

Well since you asked.......I've been in the private sector of the automotive industry for nearly 35 years, diagnosed, repaired and replaced nearly every facet of an internally combusted machine throughout my tenure and throughout all of it I have based my opinions on facts just as I'm sure you have. I was merely pointing out the fact that you took the OP's thread and turned it into an Ecoboost rant and I personally found it hilarious because you did so after you complained about your own brand blowing up! You even admit these are common issues without the dealership diagnosing what the cause was?! All I know is this, I two very close buddies that loudly state they are Chevy boys and guess what, they both drive F-250's with the all-Ford 6.7 powerplant. They have pretty El Camino's and Chevelle's on trailers but it's the Fords that get them there, you know what I'm sayin'?
All that and I didn't mention one thing about politics

 

[pronstar]

Makes you wonder how the imports did it then?

Import V8 s of comparable displacement are pretty wide and tall compared to an LS, methinks.

 

[Bigbore500r]

Well since you asked.......I've been in the private sector of the automotive industry for nearly 35 years, diagnosed, repaired and replaced nearly every facet of an internally combusted machine throughout my tenure and throughout all of it I have based my opinions on facts just as I'm sure you have. I was merely pointing out the fact that you took the OP's thread and turned it into an Ecoboost rant and I personally found it hilarious because you did so after you complained about your own brand blowing up! You even admit these are common issues without the dealership diagnosing what the cause was?! All I know is this, I two very close buddies that loudly state they are Chevy boys and guess what, they both drive F-250's with the all-Ford 6.7 powerplant. They have pretty El Camino's and Chevelle's on trailers but it's the Fords that get them there, you know what I'm sayin'?
All that and I didn't mention one thing about politics

Private sector internally combusted machine work? Sounds serious!

 

[Bigbore500r]

Why?

Speaking as someone who has worked for both domestic and import car companies, pushrod engines are lame.

Lose all the valve train components and everything gets Way more compact and efficient.

The intake and exhaust valve angles can be whatever you want them to be. No restrictions whatsoever.

Intake and exhaust runners? Yep. Same thing. Overhead cam designs are the best.

Variable valve timing get infinitely easier to manage and control. Good luck with that on a pushrod engine. It's an absolute fucking nightmare that is prone to all kinna issues. Ask half of the LS owners.

BMW long ago learned how to control valve opening timing and lift with their overhead cam engines. They can idle at 500rpm with zero vibration and rev to almost 8k with ease.

Try that with a single cam pushrod engine. No Way is that gonna happen!

Pushrod engines had their place in the history books, and that's exactly where they belong.

You should call NASCAR, NHRA, IHBA, SCTA, ASCS, let them know they’ve been doing it wrong!

 

[pronstar]

 

[Bigbore500r]

[]

@rivermobster "Pushrods are dead, outdated POS!"

*discontinues successful OHC 6.2 and rolls out segment leading pushrod V-8*


@rivermobster

 

[pronstar]

You should call NASCAR, NHRA, IHBA, SCTA, ASCS, let them know they’ve been doing it wrong!

One could also argue that Chevy put a DOHC engine into their highest performing C8 for reasons.

I think racing rules require pushrod engines because that’s what domestic carmakers overwhelmingly produce. Keeps the cost down for competitors.

At the end of the day, rpm = power but there’s a cost.
Everything is a compromise.

 

[Bigbore500r]

One could also argue that Chevy put a DOHC engine into their highest performing C8 for reasons.

I think racing rules require pushrod engines because that’s what domestic carmakers overwhelmingly produce. Keeps the cost down for competitors.

At the end of the day, rpm = power but there’s a cost.
Everything is a compromise.

I agree, everything has its place.

Except Wankels....

 

[rivermobster]

One could also argue that Chevy put a DOHC engine into their highest performing C8 for reasons.

I think racing rules require pushrod engines because that’s what domestic carmakers overwhelmingly produce. Keeps the cost down for competitors.

At the end of the day, rpm = power but there’s a cost.
Everything is a compromise.

Correct. Nascar has "rules" that need to be adhered to. To keep the playing field (somewhat) level.

Just like every class of racing does. It's all controlled and monitored for a reason.

Production vehicles have no such restrictions. They can build whatever they want, as long as it will pass emissions.

 

[Bigbore500r]

I'm liking my old LQ4 more and more.

You got them "Pre Covid" lifters.......
All the lifters today are tripple vaxxed, boosted and fucked!

 

[pronstar]

I agree, everything has its place.

Except Wankels....

Wankel is just one letter away from Wanker

 

[LargeOrangeFont]

Makes you wonder how the imports did it then?

What exactly did they "do"?

A GM pushrod v8 seems to get better mileage with equal power to other OHC v8s. These OHV engines are cheaper produce, easier to work on, lighter, and the packaging is smaller.

That is why they still build them

Tell us again how the Ford and BMW DOHC engines are pillars of power, efficiency and reliability in the automotive industry.

 

[Bigbore500r]

What exactly did they "do"?

A GM pushrod v8 seems to get better mileage with equal power to other OHC v8s. These OHV engines are cheaper produce, easier to work on, lighter, and the packaging is smaller.

That is why they still build them

Tell us again how the Ford and BMW DOHC engines are pillars of power, efficiency and reliability in the automotive industry.

BMW can suck it, but the Ford Coyote......
that there is a OHC motor i'd run. If it would fit in the engine bay. And I was rich.

 

[LargeOrangeFont]

BMW can suck it, but the Ford Coyote......
that there is a OHC motor i'd run. If it would fit in the engine bay. And I was rich.

Exactly. And if you could keep the cam phasers in it, and service it without removing the engine from the engine bay

They run well.. funny how they are not any more efficient than a dinosaur pushrod engine though.

 

[Cobalt232]

Tons of lucky 2022 GM truck owners lucked out and got engines without AFM due to supply chain shortages.

Yep, our 22 ZR2 and my kids 21 Trail Boss don't have the AFM with the 6.2's. I wish they would have deleted the stop-start as well.

 

[rivermobster]

I put almost 200 miles on my friends X5 M Series a couple of days ago.

617HP twin turbo V8. Every time I glanced down at the instant MPG, it was sitting around 17.8

Power on tap was beyond Amazing. Super fun on the back county roads.

Still, being a BMW, 100 percent lease vehicle only. Oh, and no pushrods required.

@pronstar

 

[LargeOrangeFont]

I put almost 200 miles on my friends X5 M Series a couple of days ago.

617HP twin turbo V8. Every time I glanced down at the instant MPG, it was sitting around 17.8

Power on tap was beyond Amazing. Super fun on the back county roads.

Still, being a BMW, 100 percent lease vehicle only. Oh, and no pushrods required.

View attachment 1220941

View attachment 1220942

@pronstar

If It had pushrods it might last out of the warranty period

 

[Bigbore500r]

I put almost 200 miles on my friends X5 M Series a couple of days ago.

617HP twin turbo V8. Every time I glanced down at the instant MPG, it was sitting around 17.8

Power on tap was beyond Amazing. Super fun on the back county roads.

Still, being a BMW, 100 percent lease vehicle only. Oh, and no pushrods required.

View attachment 1220941

View attachment 1220942

@pronstar

You almost got 200 miles on a BMW. Noted

 

[rivermobster]

You almost got 200 miles on a BMW. Noted

Almost!

Got hungry. Needed fooooood...

 

[pixrthis]

Not a Chevy but since we’re talking about how Fords suck

 

[pronstar]

I'm going to avoid having to contribute to this thread because I now own 3 of the 3.0 duramax that I picked or ordered specifically to avoid the piece of crap 6.2. I've had two of the 6.2's in the past and never again. Mine never seized but I've read way too many of these stories. PLUS, the MPG (avg 35mpg yesterday from LA to Mission Viejo) and the power from the diesel are too good to pass up. They barely use any def too, or the tanks are big.

I really want to like that engine.
But is have not driven it because I don’t need another truck payment

 

[timstoy]

I put almost 200 miles on my friends X5 M Series a couple of days ago.

617HP twin turbo V8. Every time I glanced down at the instant MPG, it was sitting around 17.8

Power on tap was beyond Amazing. Super fun on the back county roads.

Still, being a BMW, 100 percent lease vehicle only. Oh, and no pushrods required.

View attachment 1220941

View attachment 1220942

@pronstar

Damm Joe she let you drive her car at least you could get her car washed!

 

[rivermobster]

Damm Joe she let you drive her car at least you could get her car washed!

Wouldn't let me. I offered.

Good news is, it looked almost that bad when we got in it, so I didn't have to feel bad driving it out dirt roads!

 

[Bigbore500r]

Wouldn't let me. I offered.

Good news is, it looked almost that bad when we got in it, so I didn't have to feel bad driving it out dirt roads!

View attachment 1221258 View attachment 1221259

If your seeing a chick that has a 150k SUV......yore doing it RIGHT

 

[LargeOrangeFont]

If your seeing a chick that has a 150k SUV......yore doing it RIGHT

If you marry her yore doing it WRONG though

 

[pronstar]

If your seeing a chick that has a 150k SUV......yore doing it RIGHT

Joe has mad game

 

[bonesfab]

Joe has mad game

Not bad for a sawed off midget.

 

[Backlash]

Oh snap now you've done it!!

 

[rivermobster]

Not bad for a sawed off midget.

Might be the Italian thing.

 

[J DUNN]

I really want to like that engine.
But is have not driven it because I don’t need another truck payment

Well, theres a lot of wisdom in that!

 

[omarangel]

View attachment 1218981

Good evening D19, I know it’s An old thread. But my Denali did this exact same Sound and shaking before. It shut off on me. What did the mechanic or dealership say it was the issue on yours? I saw my oil pressure slowly drop that week it idle at 20lbs and before shut off when the chirping was happening it was at 15lbs . So I thought it was. Oil pump. But that’s a strange failure at 90k miles

 

[attitude]

Good evening D19, I know it’s An old thread. But my Denali did this exact same Sound and shaking before. It shut off on me. What did the mechanic or dealership say it was the issue on yours? I saw my oil pressure slowly drop that week it idle at 20lbs and before shut off when the chirping was happening it was at 15lbs . So I thought it was. Oil pump. But that’s a strange failure at 90k miles

What year is your Denali?

 

[omarangel]

2018 6.2

 

[attitude]

2018 6.2

Did it throw any codes?

 

[omarangel]

I didn’t make it to a autozone or mechanic . I’m guessing based on the code it’ll help out determine the root cause. Let me see. If I can get a. Mechanic to come by today or in the morning and pull the codes

 

[omarangel]

I’ve had the computer unplugged for a whole day it might now have record of the last recorded errors

 

[attitude]

I didn’t make it to a autozone or mechanic . I’m guessing based on the code it’ll help out determine the root cause. Let me see. If I can get a. Mechanic to come by today or in the morning and pull the codes

Generally speaking, oil pressure dropping and a squeak before it shuts off is not a good sign.

These motors are also prone to lifter/cam failure, which happened to mine. In extreme cases that could cause the motor to lock up.

 

[omarangel]

The day before I had any issues I had replaced my tie rod and the next morning I drove the truck. It was shaking when I went over 2k Revs I thought. I had to readjust my tie rod.. so while I was driving to a shop to get that checked , I was hearing squeaking when at the shop. Two minutes after leaving the shop my truck. My truck shut off . On this tread someone posted a video of their truck. - and it did the same shaking and sound as mine that last day I had it running .

 

[omarangel]

Generally speaking, oil pressure dropping and a squeak before it shuts off is not a good sign.

These motors are also prone to lifter/cam failure, which happened to mine. In extreme cases that could cause the motor to lock up.

I can almost be certain the sqeekk was goin on while te engine had 20lbs+ of oil pressure making me think engine failure from stuck lifters drove my rpm down enough to cause my oil pressure to drop more and turn engine off.. but I’m not a professional and I’m seeking for answers here

 

[attitude]

The day before I had any issues I had replaced my tie rod and the next morning I drove the truck. It was shaking when I went over 2k Revs I thought. I had to readjust my tie rod.. so while I was driving to a shop to get that checked , I was hearing squeaking when at the shop. Two minutes after leaving the shop my truck. My truck shut off . On this tread someone posted a video of their truck. - and it did the same shaking and sound as mine that last day I had it running .

That really sounds like your motor is locked up. GM really screwed the pooch on the L83/L86/L87s.

 

[attitude]

I can almost be certain the sqeekk was goin on while te engine had 20lbs+ of oil pressure making me think engine failure from stuck lifters drove my rpm down enough to cause my oil pressure to drop more and turn engine off.. but I’m not a professional and I’m seeking for answers here

When my lifter failed and ate the cam there was no loss of oil pressure nor did my motor shut off, I was actually about 300 miles away from home and drove it all the way back.

When the lifter fails you will have a slight shake at idle and have a misfire on the cylinder that is bad. In my case the code was PO305 for a cylinder 5 misfire, the last digit represents the cylinder, a PO300 means it is a general misfire the ECM cannot narrow down.

 

[omarangel]

That really sounds like your motor is locked up. GM really screwed the pooch on the L83/L86/L87s.

I had my truck towed to my house. I ended up taking out the spark plugs, and I was able to turn the motor freely without much resistance . Then flushed out the oil and there was no shredded metals at all. I actually had done the oil change on the truck two weeks prior.

 

[omarangel]

When my lifter failed and ate the cam there was no loss of oil pressure nor did my motor shut off, I was actually about 300 miles away from home and drove it all the way back.

When the lifter fails you will have a slight shake at idle and have a misfire on the cylinder that is bad. In my case the code was PO305 for a cylinder 5 misfire, the last digit represents the cylinder, a PO300 means it is a general misfire the ECM cannot narrow down.

Good information! Thank you, I might just have a. Low oil pressure/ Bad. Oil pump problem then. Hopefully not too. Much damage on my cam/ lifters system

 

[attitude]

I had my truck towed to my house. I ended up taking out the spark plugs, and I was able to turn the motor freely without much resistance . Then flushed out the oil and there was no shredded metals at all. I actually had done the oil change on the truck two weeks prior.

That’s a good sign, I hope it turns out to be a small issue!

 

[D19]

Good evening D19, I know it’s An old thread. But my Denali did this exact same Sound and shaking before. It shut off on me. What did the mechanic or dealership say it was the issue on yours? I saw my oil pressure slowly drop that week it idle at 20lbs and before shut off when the chirping was happening it was at 15lbs . So I thought it was. Oil pump. But that’s a strange failure at 90k miles

Unfortunately, no. I swapped out the motor for a GM factory replacement 6.2. The original engine completely locked up, but we never figured out the cause of the failure since we didn’t tear it down. It would’ve been more expensive to do that, and I had to trade the old engine in for the replacement. I didn’t notice any drop in oil pressure or get a check engine light. The engine started making a grinding sound, kind of like the torque converter was failing, and then it locked up shortly after. The AFM was deleted and I didn’t have any oil consumption issues.

 

[Lower river sludge]

Hmmm. We have a 2024 Tahoe with a 6.2. So far so good.

https://finance.yahoo.com/news/gm-facing-safety-probe-into-870000-suvs-and-pickups-how-bad-is-it-184430468.html

 

[attitude]

Hmmm. We have a 2024 Tahoe with a 6.2. So far so good.

https://finance.yahoo.com/news/gm-facing-safety-probe-into-870000-suvs-and-pickups-how-bad-is-it-184430468.html

I really like the 2025 update to the Tahoe/suburban. I hoped GM fixed the issue for 25+. After the experience I just had with my L86 there is no way I’m touching a L87. It’s tough to be a GM fan right now.