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  1. M

    Help me decide what to do??

    Take a pic of the SPID sticker in your glovebox. Look for one of the following three-character codes: GU5 = 3.23 - NOO! GU6 = 3.42 - YUCK GT4 = 3.73 - MEHH GT5 = 4.10 - YEAH Knowing is half the battle. Other half is figuring out which is cheaper: front or rear diff? Anyone can swap an axle...
  2. M

    2020 6.2L: misfires, lifter issues and engine replacement

    I freely admit to not reading this slowly enough the first time. If it makes you feel better, find THE ABSOLUTE CHEAPEST oil filter, and change it every time you change the oil. Engines cost more than oil. Engines cost more than oil filters. Q.E.D.
  3. M

    What cam did you go with, why, and do you like it?

    Even after driving for over 40 years, I STILL drive like I'm always running late. For me, the 2010 Suburban front brake kit was an absolute NECESSITY without question. Despite my lead foot, and my tendency to floor it 10x more often than normal slowpokes, Can't even remember the last time I saw...
  4. M

    Is my transmission talking to me?

    You should DEFINITELY update, if not upgrade the ATF thermal bypass valve. Don't know if using 8L90 ATF is necessary, although I know a guy who's been using it in 4L60s for years with no issues whatsoever. If you're gonna update / upgrade the ATF thermal bypass valve, might as well change the...
  5. M

    Help me decide what to do??

    BOOO. The correct ratio is the more assertive ratio, not the weaker one! Ok, seriously: Is it cheaper to upgrade the front diff? Or to downgrade the rear diff? My hope for you, is, upgrade the front diff. Unless nearly ALL your driving is highway miles, you want 4.10 axles - especially if you...
  6. M

    2013 Yukon Denali Hybrid AFM Delete won't pass emissions

    Is your tuner's secret sauce so secret, that not only will you not give us any clue what your tuner did, but you also won't tell us his (business) name?
  7. M

    2020 6.2L: misfires, lifter issues and engine replacement

    There is something fundamentally wrong with an engine's INITIAL design specs, such that when a SINGLE lifter gets stuck, the pound of cure is to replace the engine entirely. In an ideal world, replacing that stuck lifter alone should be enough. Do keep in mind, especially given the GenV 6.2L...
  8. M

    Oil pressure low

    That's one reason why I never settle for the 'basic' filter offered by any brand. I.E.: instead of Fram's PH3675, try XG3675 or TG3675 instead of Purolator's L25288, try PBL25288 instead of Wix's 51522, try 51522MP. Willing to risk wasting a few extra bucks per oil filter for a better oil...
  9. M

    Oil pressure low

    Wix 51522MP, not merely 51522.
  10. M

    Oil pressure drop 2007 Tahoe 5.3

    My admittedly blunt rule of thumb for oil filters is as follows: Never buy any brand name's 'basic' offering. I.E.: instead of Fram's PH3675, try XG3675 or TG3675 instead of Purolator L25288, try PBL25288 instead of Wix 51522, try 51522XP Mobil1 M1-206 doesn't have an upgrade, right? Also, I...
  11. M

    2015 and 2016 Escalade w/ 6.2 engines blown

    Don't know what to say about the two that are already down & out from cardiac arrest. Should you be worried? The question you should be asking (that has nothing to do with feelings, yet will make you feel better) is: Should I change my lifters? Or is there something wrong with the lifter bores...
  12. M

    2023 Tahoe/oil additives

    If I could talk 'em down to $2,875 for the 6 yr 60k warranty I'd consider it, 'cause it's likely you'll spend $2,875 fixing its various sundry issues over the next 6 years.
  13. M

    Lug nuts??

    Some GMT800s had rear drums, but nearly all of those were pickup trucks. If I learn of a GMT900 with rear drums, that'll be a lesson, 'cause I thought there was no such thing as a GMT900 with rear drums.
  14. M

    2023 Tahoe/oil additives

    If you have no clue which specific oil additive - THE oil additive? REALLY? - then there's no way to know if the additive is helpful, harmless, useless, or bad for your engine. To skip over a bunch of schidt, if you change your oil when the Oil Life Monitor says 25% instead of less, and you...
  15. M

    Oil pressure low

    Believe it or not, this is quite imprecise. Since winter is coming, I recommend NON-high mileage 5W30 synthetic from Mobil1, Valvoline, Quaker State, or Pennzoil. (I won't use Castrol even if I get it for free If the only symptom is oil pressure which is on the low side of acceptable, you need...
  16. M

    How often do you go WOT aka "Italian tune up"?

    Long story as short as possible: Deceleration Fuel Cut Off A bit longer: Usually (when the TPS% is more than 0.0%) the engine turns the transmission which turns the R&P, which turns the tires, which push on the road. Whenever the TPS% is 0.0% (for argument's sake, let's oversimplify), the road...
  17. M

    How often do you go WOT aka "Italian tune up"?

    There's a road speed under which, if you stomp it suddenly, it'll make a big to-do out of a multiple downshift, followed by jumping over a couple thousand RpM. The trick to an 'italian tune up' is to quickly roll into the throttle without stomping it from a low speed, so that you don't...
  18. M

    Flashing engine light then no AFM cylinder deactivation

    Depends on which trouble code(s) is/are being set.
  19. M

    2013 Yukon Denali Hybrid AFM Delete won't pass emissions

    Email pcmperformance.com.
  20. M

    Flashing engine light then no AFM cylinder deactivation

    Your Engine Half@$$ disabled itself? AWESOME. Actually, you need to find out WHY it disabled itself. Any other symptoms at all whatsoever?
  21. M

    Synthetic vs conventional

    What does the other side of the bottle say, in terms of specs met or exceeded?
  22. M

    Does my radiator have an engine oil cooler?

    This is true. It's engine coolant, because it keeps the engine from overheating. However, vis a vis the ATF heat exchanger, engine coolant also serves as an ATF heatant, because ATF would always run cooler without the radiator's ATF heat exchanger. (UNDER normally intended operating temp, it's...
  23. M

    Tran/torque converter advice

    You already disabled V4 mode, congratulations. Change your ATF at least as often as the SEVERE SERVICE schedule suggests. Address the ATF cooling situation as suggested by Rygrego.
  24. M

    05 Denali Put in D for drive but felt like Neutral

    Change / refresh your ATF. If you're feeling frisky, have your old ATF analyzed.
  25. M

    Leaking exhaust manifold

    When an engine has an exhaust manifold leak, the oxygen sensor(s) will see a FALSE lean condition. To 'correct' this FALSE lean condition, it will add extra fuel. So it will hurt your wallet - exhaust manifold leaks waste fuel in closed loop. You also need to change your oil more often, as it...

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