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  1. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    SPS says strategy code for 5.3/6.2 TCM is the same so there won't be any difference in shifting. 10th is your prime highway gear and either configuration will stay there at steady speed up to 80mph or higher when not trailering. Lugging the engine is bad for emissions so that's why you see any...
  2. R

    BREAKING: GM is officially recalling the L87

    Yep. Too bad we're flat rate otherwise I'd be putting my kids through college with this BS. The oil weight is a complete red herring. I've never seen one of these engines open with excessive wear that wasn't neglected. All on 0w20 per fleet contract. That said, I run 5w30 in my 5.3 to take...
  3. R

    2024 5.3 Ticking

    I wouldn't say they all make that snapping/tick noise, but the majority do. It's been a thing for years now. The fleet trucks I see with the 5.3 do it although I have noticed less of it in units over about 40K miles. The retail stuff is the same way. No clue what it is. The catalyst brick on...
  4. R

    5.3 - Has GM Resolved the Lifter Failure Issue?

    Outside of the known bad batch from 2021 there really aren't widespread lifter issues with either engine that can be attributed to DFM. Yes they can fail but the de-act mechanism is absurdly reliable when you think about how many times they move. My dealer is on the smaller side so lifter jobs...
  5. R

    Disable AFM

    CAFE did not "force" auto makers to do any such thing. It's a mischaracterization of the Standards to say that. American OEMs simply did not invest in those products like the foreign brands. There is no disagreement that these Standards have made modern vehicles a "modern marvel" in their power...
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    Disable AFM

    Your 2nd paragraph requires an answer too long to type at the moment. CAFE is not a bad idea just implemented poorly largely because of the revolving door between big business and government. Larger vehicles are more profitable and CAFE essentially pulled forward a lot of demand in larger...
  7. R

    Disable AFM

    Again, that’s not how that works. NAAQS are legislatively mandated by the Clean Air Act and subsequent revisions. Statute of limitations for CAA knowing violations is 5 years so no business operating above board is going run the risk of violating the law.
  8. R

    Disable AFM

    N Not how that works. CAA is Congressional legislation and isn't going anywhere. GM gets the 5.3 to ULEV50 with DFM and they sell that engine in other markets so there's no point in having multiple versions. Whichever way GM wants to meet the law is up to them. Big gov doesn't require cylinder...
  9. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Lifter bore issue was limited to 2023 units and even then not anywhere near all of them. Purely anecdotal I see most 6.2 issues on refreshed MY22.5 and MY23 trucks. We don't do Cadillac stuff so it's rare to get a Tahoe in with that engine.
  10. R

    Disable AFM

    Yes that's been a thing even going back to the 6 speed units a decade ago. It "shouldn't" hurt anything but at the same time I'm not sure I would guinea pig myself for 100K miles running on the highway in 9th gear with the E clutch applied. Probably a non-issue though.
  11. R

    Driving in L9 and DFM

    When the customer can’t provide oil change records and the engine clearly wasn’t maintained with the correct oil and mileage. Yes some people do run cheap recycled oil in their $65K vehicles and expect warranty coverage. Thats 1 out of a thousand reasons I’m getting out of dealer work and...
  12. R

    Driving in L9 and DFM

    The actual de-act mechanism of the lifter failing is really rare with the DFM engines outside of the known bad batch. Like really really really rare. I've only seen a couple that I remember in the last couple of years. The roller bearings are what can fail and cause cam damage and that can...
  13. R

    Driving in L9 and DFM

    September 1, 2020 to March 31, 2021. Contact any dealer and provide your VIN and they can tell you if any were replaced. Initially we were only replacing one side (which IMO was dumb) then after some time all 16 were instructed to be replaced. If yours got out before the stop-sale it's worth...
  14. R

    Anyone have a crooked exhaust - 6.2l?

    Nope haven't seen exhaust clamps on anything OE for 20+ years unless you count the headpipe which is just a ball clamp. No adjustment there. This has been an "issue" since MY21. It's not as noticeable on the trucks because of the exhaust bezel. My guess is the tubing expands/contracts with a lot...
  15. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Everything we've been told at the dealership level (which ain't much) points to a bearing supplier issue. Assembly QA problems can always slip through but that would be VERY rare. I have a relative that works at Spring Hill and he tells me almost every machined surface is checked 2 or 3 times by...
  16. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    That engine is a reman unit. I work at a dealer and have seen a few 6.2s disassembled onsite. Never seen an issue with wrist pin clips but have seen the piston in the oil pan after the connecting rod snapped. When the bearings gall some people keep on truckin' until it locks up at a stoplight...
  17. R

    No reverse on 2022 Yukon

    If you don't know anything about it then why speculate? OP, do you have an extended warranty? If not I'd suggest taking it to an independent transmission shop but that's me. Good news/bad news is it's not an uncommon failure mode caused by pressure bore wear. At a dealership level GM will not...
  18. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Other than some superseding component part numbers the engine hasn't changed since it rolled out in the summer/fall of 2018. Lifter p/n changed in MY22 but unsure what actually changed. They're listed as backward compatible to all DFM and AFM engines now. Completely anecdotal evidence I've...
  19. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Lifter replacements slowed down for us quite a lot once the bad batch of 2021 was worked through. I've seen a couple here and there but nothing DFM related. It's usually the roller bearings in the lifter that failed. Lifter problems caused by the de-act mechanism have never been much of an issue...
  20. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    You cannot out-maintenance defective bearings. That is the problem causing the catastrophic failure. Lifter bore sizing, valve spring heat treat, etc were all separate issues that did not present as sudden engine failure.
  21. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    You may want to present these findings of yours to the two OEMs I've worked for. It would be news to them as it's counter to every bit of training I've had going back a decade. You can also admit you don't know what you're talking about. Naturally aspirated engines do not have a high enough...
  22. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Complete engines and transmissions actually haven’t gone up in price that much for years now. Some adverse with a core charge and some do not. I’d wager that’s what you’re seeing. You can get a 6.2 delivered within a few days with 4 digit mileage from a number of large recyclers but you run the...
  23. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Why are you folks still bringing it up LSPI? It simply isn’t a concern on naturally aspirated engines. That was only an issue on early iterations of small displacement direct injected turbocharged engines. Even then it was primarily an issue with cheaper Asian brands.
  24. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Pumps are not interchangeable but you'd think they were looking at them. Both are "2 stage" as in they're both variable geometry pumps. GM does reference the L84 as "single stage" but it's more marketing than anything else. In theory they're infinitely variable but GM only uses a binary high...
  25. R

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    LSPI really isn't an issue with atmospheric engines. Forced induction different story.

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