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  1. RobH

    Need help please- 2019 Yukon 6l80e manual mode disappeared

    Bummer. One reason I don't like updates. They can change the behavior of unexpected things. Or remove previous functionality. Have you tried Doubeleive's suggestion to press the + or - button on the shift lever? Maybe that will summon "Manual" mode. Can you physically move the shift lever...
  2. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    Thank you. I suspected something like more credits for the TCM. Thanks again.
  3. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    I'm a retired IT guy. So I know my way around programming. I understand that the companies that provide the software to download the Engine Control Module (ECM) and Transmission Control Module (TCM) settings files ("tunes" or "calibrations"), edit the files, and then upload the modified...
  4. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    I want to get the AFM turned off in my 2016 Tahoe. At the moment I am driving with the transmission in M5 which prevents V4 operation. If I operate the transmission in M6, AFM remains disabled in 1st - 5th gears, but in 6th the AFM is enabled again and switches back and forth from V8 to V4 to...
  5. RobH

    Upgrade package - exhaust/suspension/wheels

    What 91RS ^^^ said. When most people think about wheel size and/or tire size they are thinking about something like 275/55/20 or 285/45/22. What is pertinent for the speedometer is the over all circumference of the wheel/tire combination rolling down the street. The circumference (distance...
  6. RobH

    Tahoe got hit

    Sure sorry to hear that. I hope she's not too rattled. I hope she got a police report and pictures of both vehicles and the accident scene with the vehicles where they came to rest. I have been in a couple of accidents where what was claimed afterwards had no relation to what happened...
  7. RobH

    First problem after one year on 2018 Yukon XL Denali

    With the mileage and a bad lifter perhaps damaging that lobe on the cam, you're possibly in line for a new cam, Variable Lifter Oil Manifold (VLOM), and some other things that you didn't mention in your first post. If you haven't already done so, reading this thread may give you information to...
  8. RobH

    2017 Escalade/Denali L86 "requires" 93 octane - your experience?

    FWIW, this is a quote from the 2017 Escalade Owners Manual, "Do not use any fuel labeled E85 or FlexFuel. Do not use gasoline with ethanol levels greater than 15% by volume. Premium unleaded gasoline...with a posted octane rating of 93 is highly recommended for best performance and fuel...
  9. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    Actually, I would prefer to have my SUV towmobile look like a Chevy instead of a Cadillac. I don't like attracting more attention than necessary. 10,130 foot Cochetopa Pass in Colorado. in Idaho I've decided to stay with my 2016 Tahoe with the reman 6L80 and new brake rotors and pads...
  10. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    Yes on the modules. If I had it to do over again, I might have held out for a simpler LS Tahoe instead of getting my 2015 LT. True confessions, I put over 100,000 miles on a 1995 ex highway patrol 9C1 Caprice I bought in 2000 and sold with 208,000 miles on it nine years later when I retired...
  11. RobH

    6.6 Gas L8T Engine Swap in 2015 Suburban

    This may have already been covered. @L8T BURB's investment is his new 2021 transmission and V8. We all know that he has much more than a rebuilt 2015 V8 and 6L80E. But, that was his cost. So, selling it as a 2015 Suburban with new engine/transmission replacement in 2023 should get back his...
  12. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    My experience with fancier cars is that fixing the fancier systems is expensive. We bought a 2006 Mercury Gran Marquis LS with the Handling and Performance Package equivalent to the Crown Vic police package. Nice car. The throttle body position sensor failed a couple of thousand miles out of...
  13. RobH

    2017 Escalade/Denali L86 "requires" 93 octane - your experience?

    The 2017 Denali and Escalade Owners Manuals say "Fuel (L86 6.2L V8 Engine). Use premium 93 octane unleaded gasoline in your vehicle. Unleaded gasoline with an octane rating as low as 87 may be used, but it will reduce performance and fuel economy." I know that the engine computer can enrichen...
  14. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    I believe that it is 4WD. I'll know this afternoon after I take the VIN to my nearest GM parts counter and get a printout of of all the equipment and options. Thanks everyone for your info.
  15. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    For the 2017 Escalade knowledgeable, she reports it's a Platinum, but didn't bring it to church this morning. So, I haven't seen if it has an integrated trailer brake controller or heavy duty integrated receiver hitch. Pro's: it has a 6.2 liter engine, 100K less mileage and an eight speed...
  16. RobH

    Most miles with stock AFM system?

    I've changed lifters before without pulling the heads. Removed the rocker covers, removed the rocker arms, pulled the pushrods, and pulled the lifters. That was before roller hydraulic lifters and the LS/LT engines, though. Removed the cam out through the front of the engine compartment after...
  17. RobH

    Intro - First Offical Post (Recent replaced 98 Yukon with a 17)

    You may have caught me in the midst of correcting my error. Thank you. The correct code for the 6L80E is MYC. MYC, darn it. My fingers like to mis-type the characters. :) MYC like on my SPID picture above. ^^^
  18. RobH

    Intro - First Offical Post (Recent replaced 98 Yukon with a 17)

    Further to my last, there should be a SERVICE PARTS IDENTIFICATION (SPID) sticker on your glove box door. It lists the three character codes for Factory installed equipment. The code for the 6L80E transmission is MYC. 6 speeds L Longitudinal/RWD orientation 80 - power handling rating E -...
  19. RobH

    Most miles with stock AFM system?

    2016 Tahoe 5.3L. 135,000 miles. Stock AFM. I have started driving with the transmission in M5. Plan to get a tune. Really don't want to have to get the engine repaired on a road trip. I can also get the transmission pressures adjusted to help my reman transmission live. Does a person have...
  20. RobH

    What weight oil do you use in the South?

    How much total mileage do you have now? What year and engine do you have? It would help if you put that info in your signature. Thank you.
  21. RobH

    Changed my filter and fluid on 8l90 8 speed today

    Did you install a drain plug in your pan? I've used drain plugs from Summit in the past.
  22. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    My 2016 Tahoe LT has the NHT Max Towing Package and 135K miles with a GM re-manufactured 6L80E a year ago at 125K miles. Two years and 90,000 miles to go on the factory warranty. In south Texas, snow is not an issue. I like that it is 2WD with the locking differential instead of 4WD. I put...
  23. RobH

    Intro - First Offical Post (Recent replaced 98 Yukon with a 17)

    The original issue transmission thermal bypass valve (thermostat) for the MYC (6l80E) and MYD (6L90E) transmissions maintains the transmission fluid at around 185F. The Service Bulletin No.: 21-NA-199 (search online for the current version) calls for installing a 70C/158F Thermal Bypass Valve...
  24. RobH

    Buying a 2020 Yukon with L83 5.3L EcoTec - Should I worry about AFM Lifter Failure

    Ok. I give. :) AFM is Active Fuel Management. Collapse lifters for four cylinders and shut off fuel to those cylinders under low load conditions. DOD is Displacement On Demand. Same as AFM. Collapse lifters for four cylinders and shut off fuel to those cylinders under low load conditions...
  25. RobH

    Towing a trailer with automatic leveling system

    I do the same. Hitch and adjust with the ignition off. Your manual should have instructions for hitching with a weight distribution hitch. My 2016 manual says to adjust the weight distribution system to make the front fender opening height the same as when unhitched. This keeps an...

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