May 31, 2023

Thanks. Luckily I never had a collapsed/stuck lifter issue in the first place and now the vlom plate it torqued down properly.. but yeah, for all the good reasons I'm either going to keep the disabler or just mail in the ECU. Also debating my own $400 programmer, but the bad reviews are really discouraging. The 87 octane tune and arm disable are very attractive though.. so still debating on forward course... Could also throw that oil passage block in there with the disabler too. It seems like the only downside would be if the disabler failed, i'd throw some codes for 4 cylinder mode errors. (that and mechanically reversing it at each battery change if I have to re-set emissions).

May 31, 2023
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I would be very cautious with this. There's a good chance you will end up with a collapsed lifter again by running the AFM at all. It's a much better option to do the tune because it will still pass emissions. As a side note: if you choose to risk leaving the system available for the sake of emissions test, pay very close attention to your oil pressure. If at any point at all it drops below 26 PSI while it activates(it's most vulnerable while it comes to a stop sign), it will bind and damage the locks in the lifter. This is the reason for lifter collapse in the first place. Unfortunately that is for 26 PSI at the lifter, the oil pressure sensor does not measure the pressure at the lifter. It only measures the pressure before it goes to the solenoids for the lifters. So if your VLOM gasket leaks or solenoids don't flow correctly It will be below that 26 psi and you won't even know it. You will just suddenly have a collapse lifter at some point.

With all that said though I'm glad you got it taken care of and working.

May 28, 2023

Just to close this out.. (I missed taht April 18 post BTW)... When I removed the VLOM plate, 5 bolts came out with my fingers, so yeah, they have a problem and everyone likely has a ticking time bomb.... I ordered a remanufactured Head. Carefully assembled/torqued everything down. Verified good oil lubrication coming up through the rods and have been running the vehicle for about a month.

All emissions checks are cleared and no leaks anywhere.

Changed oil and everything is clean, no fragments on drain plug magnet.

4/8 cylinder AFM working as original.

Re-inserted ODB 4 cylinder disabler.

Other things /learnings that may be of interest to pass on.

-As soon as I started it up I had coolant leading from rear of engine.. Removed intake manifold again (fun). to find the rear plug on the head was drilled out (apparently the norm for cylinder head rebuilds). A common and simple plug was ordered from amazon and got it plugged and re-installed everything.

-Emissions will not clear if the 4 cylinder disabler is plugged into ODB port

-I first left the little oil block cylinder I ordered here in under the oil pressure gauge to physically block any oil pressurization to prevent 4 cylinder mode and use odb disabler.. After I found you must remove the disabler, I tried to drive it enough to clear emission in trailer mode as it reduces frequency of 4 cylinder deactivation greatly. But on the freeway it showed on screen 4 cylinder mode switch.. Scanner then showed pending codes for 4 cylinder activation. Thanks to the tip of removing that rear plastic noise baffle, I was able to remove oil pressure sensor easily (with proper socket) and use needle nose pliers and pull them open (vs squeeze) to grab the inside wall of the cylinder insert and pull it out. Dropped in a filter to make it stock. That let me get emissions to clear. (vs leaving it in and getting ECU reprogrammed).

Apr 18, 2023
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The 6.2L is actually known for this issue. I've seen it before on an LS3 which is basically the same thing. For some reason they didn't do a very good job with getting the seat pressed in their tight enough. The last one I seen this on completely blew the piston to pieces and destroyed the head You got lucky. If you want you can just put a new piston in there. I probably wouldn't run that piston it looks like it hit it pretty hard. You might actually be able to even repair that cylinder head yet by installing a new oversized seat.

Apr 16, 2023

Well, pulled the head today and apparently the entire valve seat came loose and moved down into the cylinder, which blows my mind how that is even possible. And the piston was banging on the valve and dug into the piston pretty well.A neighbor said it potentially could have cracked/damaged the piston rod. (based on a car he had 40 years ago). This is an L94 6.2L GM. Thoughts on the Piston? rebuild the entire piston assembly or go with it as is? (was not planning on investing that much.. but...)

Also, all of the lifters looked beautiful. No wear on the rollers at all.

Is there any way this is related to the typically lifter issue, or did I just get lucky with a freak failure no one else is having on these engines?

Apr 15, 2023

HI, so pulling head tomorrow to take to a local reccomended shop for the valve job. GM is sold out of the adjustable lifters and I could swear I saw some used/inspected ones here for sale but now can't locate them. I want to replace the #7 lifters. Do you have any left? i've seen lots of horror stories of junk chinese ones not pumping oil and located this one as a most likely potential to use... Thoughts?.... https://www.amazon.com/gp/product/B0BYXX82ZV

Mar 30, 2023

Thanks for the reply. Lifter has a little play (1/16" or so worst case in a rotation) but then again the spring doesn't come up.. I didn't notice the spring not being the same height till I did my tapping w/your tool, but didn't "feel" anything pop loose. I think it was the same 1/16th" before the tapping and futzing around taking off the rocker arm.

Any recommended shops around Austin/san antonio you recommend?

Wife parked truck in a parking lot. Went to start it up and it had trouble (both times this happened)

FYI.. 11 months prior I had the same behavior. Added a quart of rislone, let it sit for a few days.. fire it up, gave it a good rev and heard a pop, then it ran great for the next 11 months and one of these at the time: https://www.amazon.com/gp/product/B07TTRC3MM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

never saw v4 mode again. Probably should have just pulled the computer and mailed it but that made me nervous and I'd recently seen a fedex truck car-b-q and imagined my computer in there. Although maybe totally unrelated for this failure.

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Mar 29, 2023
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This is not a common Issue at all. However it is possible of course. Did this have a floppy loose rocker like in my video? If so, it's possible the lifter collapsed and the pushrod hit the rocker just right (or wrong depending how you see it) that it opened the valve too far causing interference and bending it. Regardless this means the head has to come off and should get a new valve, full valve job and get it resurfaced. I would recommend doing both heads but you could get by with one. Only thing is, if you go that far maybe do a full delete at that point? You should at least replace the lifter in question now though.

Mar 25, 2023

Oh, Forgot to mention the vehicle.. 2010 L94 6.2L Cadillac Escalade ESV (suburban)

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