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Message
re: GM's 6.2 & 5.3: Sudden Engine Failure
Posted on 1/28/25 at 1:47 am to Turnblad85
Posted on 1/28/25 at 1:47 am to Turnblad85
quote:
Buying a 15yo beater to get back and forth to work? Sorry, those where sent to the crusher 5 years ago. Or they buy the beater and the engine capitulates and the minimum wage cashier needs a new 7k engine.
But then duplicitous Dems get to blame her problems on “corporate greed” and the cashier believes it thus ensuring the usual suspects maintain power another cycle.
0
Posted on 1/28/25 at 6:02 am to AndyCBR
quote:
That device will generally buy you time but the lifters in the engine have a finite life and will fail eventually. AFM can also be deactivated with tuning, but same above caveat applies.
So with an engine replacement, isn’t the same problem going to occur again at some point?
I’ve been back and forth on pulling the trigger on a Tahoe due to this issue and I think this thread convinced me not to do it.
Is the diesel option actually reliable? Sad thing is that it’s a significant upgrade on the 25 Z71 Tahoe.
Posted on 1/28/25 at 9:12 am to Chef Curry
quote:
So with an engine replacement, isn’t the same problem going to occur again at some point?
Best thing to do is delete the system if you buy one used. Get some basic or higher performance lifters and enjoy smooth V8 mode for the next 10 years with no AFM lifter issues.
The most reliable GM motor was the 4th generation LS design with no cylinder deactivation. If you get a 98-06 GM truck or SUV, it will run forever. It’ll eventually leak oil like crazy but it will continue to run.
Posted on 1/28/25 at 9:15 am to bapple
quote:
Best thing to do is delete the system if you buy one used. Get some basic or higher performance lifters and enjoy smooth V8 mode for the next 10 years with no AFM lifter issues.
Thanks. So I assume driving a Z71 in trailering mode isn’t a workaround either?
Posted on 1/28/25 at 9:19 am to bapple
Back to your 2018 Yukon post (all very impressive and informative by the way). How is it doing? Any issues, leaks, etc?
This post was edited on 1/28/25 at 10:22 am
Posted on 1/28/25 at 9:59 am to N2cars
GM ruined the V8’s after the ‘99-‘07 classic.
Posted on 1/28/25 at 10:02 am to jake wade
Nahhhh. The vortec 6 liter is probably the best general purpose pickup truck engine ever built.
Posted on 1/28/25 at 11:04 am to Northwest Louisiana
quote:
Thanks. So I assume driving a Z71 in trailering mode isn’t a workaround either?
That would essentially be the same as getting the range device. It is only electronically disabled but not mechanically deleted. Still better than having the system operate in 4 cylinder mode constantly but mechanical delete is the best.
quote:
Back to your 2018 Yukon post (all very impressive and informative by the way). How is it doing? Any issues, leaks, etc?
The engine is in great shape. It was already working and not actually broken when I did the delete. But the mechanic told me it looked great internally and obviously all gaskets were replaced so no leaks or anything.
The thing that will probably eventually give me fits is the 10 speed
. They aren’t exactly made for longevity and mine is very finicky about temperature and hard shifting sometimes. The torque converter is fine so as long as it’s shifting and driving normally I’ll just keep rolling until everything fails. Posted on 1/28/25 at 12:03 pm to DownshiftAndFloorIt
I agree, I like them so much I built a LQ4 to replace the LM7 in my 2006 Silverado.
Most of the 6.0’s after ‘07 did not have AFM but, some did.
Prior to ‘07 there were none.
Most of the 6.0’s after ‘07 did not have AFM but, some did.
Prior to ‘07 there were none.
Posted on 1/28/25 at 12:28 pm to N2cars
This has been a problem. My Neighbor has a High Country with the 6.2L in it. threw a rod at 4,500 miles. Helped me make my decision to get the 3.0 Duramax in my truck.
Posted on 1/28/25 at 12:32 pm to Chef Curry
quote:
Is the diesel option actually reliable?
We have three vehicles in my immediate family with this motor. The highest mileage being around 125k and zero problems.
Posted on 1/28/25 at 1:29 pm to DownshiftAndFloorIt
quote:1st new vehicle I ever bought was a Tahoe with the first year of the vortec. Last I heard that Tahoe was still running fine, it’s been almost 30 years now
The vortec 6 liter is probably the best general purpose pickup truck engine ever built.
Posted on 1/28/25 at 1:50 pm to AndyCBR
quote:
That device will generally buy you time but the lifters in the engine have a finite life and will fail eventually.
AFM can also be deactivated with tuning, but same above caveat applies.
All lifters have a finite life. Yes some last longer than others.
The problem with afm lifters is they collapse to go in 4 cylinder mode and don't expand again leaving an undersized lifter.
The c7 corvettes with manual transmissions don't seem to have these issues because you have to put it in eco mode for the afm to engage.
The c7 automatics will go into afm unless you are shifting manually with the paddle shifters and according to vette forums have a lot more lifter issues than the manual cars.
Posted on 1/28/25 at 1:57 pm to bbarras85
Own a 014 Silverado Z71 with 6.2. Was cruising at abt 75mph on I10 on my way to New Orleans (from Jawga) threw a rod at ~30k miles. Had to replace engine. Thankfully it was just under warranty. Otherwise, would have set me back about $10k.
Posted on 1/28/25 at 2:13 pm to bapple
quote:
That would essentially be the same as getting the range device. It is only electronically disabled but not mechanically deleted. Still better than having the system operate in 4 cylinder mode constantly but mechanical delete is the best.
I have a 2015 Ram and it has a similar feature where it “knocks out” some of the cylinders for better fuel economy. I’m not mechanically inclined so idk how it differs from a Chevy? My Ram has 120k miles on it and I haven’t had any issues.
Posted on 1/28/25 at 2:49 pm to Tigersaint01
I had a 14' as well and threw a rod doing about 40 leaving the deer camp. Drove it several miles until I could get to a place to wait on a tow. I was just inside my factory warranty too. Total bill for them to rebuild the entire passenger side top end and replace the entire exhaust from the manifold back was just over $10K.
I ordered a tuner while it was in the shop. The day I got it back I deactivated the AFM and never had a problem after that. Sold the truck with 175k on the dash.
I ordered a tuner while it was in the shop. The day I got it back I deactivated the AFM and never had a problem after that. Sold the truck with 175k on the dash.
Posted on 1/28/25 at 4:25 pm to N2cars
Posted on 1/28/25 at 4:27 pm to 4WHLN
quote:
threw a rod
quote:
rebuild the entire passenger side top end
You don't know what throwing a rod is, do you.
Posted on 1/28/25 at 4:34 pm to DownshiftAndFloorIt
quote:
The problem is the shite oil pumps and lube strategy and 0w20 oils. They are all using variable displacement pumps now (as far as I know) and in the name of decreasing idle fuel burn are basically not pumping anything at idle to minimize pumping losses.
Thank government regulators for this.
No manufacturer wants to put that stuff, oil or pump, in their engines. It's all about satisfying regulations no one voted for. A bunch of tree hugging bureaucrats came up with the regs.
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