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  1. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    I would have to ask someone more knowledgeable how quickly the tick will turn into something of a concern. Seeing a check engine light due to misfire will indicate certain damage.
  2. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Excessive camshaft lobe scoring/wear, metal shavings in oil, loss of compression and misfires in affected cylinder, unburned gasoline in the exhaust? I would get if fixed before there’s a need for a new engine unless you are in the middle of a desert and your life depends on it.
  3. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Really sorry to hear that. Hopefully you are back in business soon.
  4. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Also, what was the mileage when this happened?
  5. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Is there anything interesting on the leased-financed-warrantied 21+ except for the window tint and wheels/tires/level?
  6. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    My 2018 Tahoe didn’t have the flex fuel sensor from the factory and didn’t have the E85 compatibility window sticker. Same with my 2021 Sequoia, but it’s really not worth converting it to E85 because there’s no ethanol sensor and the fuel/ignition parameters are calculated based on fuel trims...
  7. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    In the ballpark of 40 to 45. It almost started to feel like the 6.2 in terms of torque. I guess the 6.2 on E85 is even better…
  8. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Also, in addition to the forum check out this channel: https://youtube.com/user/pmoore4321 One of the videos describes how to convert your 6.2 Yukon to E85.
  9. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    All you really need is the sensor and the flex fuel tune. The high pressure fuel pump and injectors can already support it - hence you can run a supercharger on a stock cam and stock fuel system on premium gas. You will run out of fuel if you decide to do forced induction AND do E85.
  10. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    You actually can run E85 in your Yukon. That was exactly what I did to my Tahoe (it was not flex fuel from the factory). The only missing portion of the flex fuel system can be easily added back - e.g. the ethanol sensor...
  11. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    I have the exact same one. Works perfectly for me as well.
  12. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    And finally, the option for the most paranoid (also me): get one of the vacuum oil suction devices and replace 1 gallon of ATF with every oil change through the dipstick. 1 gallon of Dexron VI is about $29 on Summit Racing.
  13. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Anecdotally the same 6l80e in Silverado prior to 2014 did not have the thermostat in the cooling line. I wouldn’t worry too much about the temperature and just replace the fluid and filter every 40k miles. My new Sequoia runs hotter, somewhere between 200 and 220 F. I will be switching to 100%...
  14. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    I’ve seen good results with this mod year round: https://globaltransmissionparts.com/6l80-6l90-sure-cool-cooler-flow-system-stl010/ It basically makes the ATF always circulate through the cooling circuit. My temperatures were 140-150 F in the highway during summer, 110 F in South Dakota winter...
  15. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    I’ve anecdotally heard that replacing your engine air filter frequently also helps with fighting valve deposits. The theory behind it is that the clogged filter will create more intake vacuum and pull in more PCV vapors with oil mist in them.
  16. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Port injected 5.7 that gets 12 to 13 MPG anyone? The DI system adds complexity but definitely helps with efficiency. I used a can of CRC cleaner at around 40,000 miles on my Tahoe and sprayed it right in front of the throttle plate. Not sure how much it helped, but the engine seemed smoother...
  17. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Any concerns about the moisture inside the can and hoses freezing over in winter and completely blocking the PCV?
  18. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Almost forgot: an OEM ethanol sensor also needs to go.
  19. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Mostly the new vacuum pump + vacuum pump belt (was going to replace with the front diff service at 50,000 miles) + 1 set of OEM wiper blades + 1 set of OEM air filters + 2 Mobil 1 oil filters. There’s some Dexron and DexCool, but shipping on those wouldn’t be my first choice.
  20. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Both are excellent vehicles. The Tahoe was more of a towing plain Jane rig and I don’t tow. I was missing some of the higher trim level features - mostly the adaptive radar cruise control. The Toyota has a lot of flaws but it just fits my needs better at this time.
  21. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Did the best LED lighting mod to the Tahoe to date: traded it in for the 2021 Sequoia Nightshade. I have some spare parts and maintenance items that I’m willing to donate if someone is interested.
  22. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    2.0 -> 3.0 upgrade it is.
  23. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    Some night pictures for the color reference. The Morimoto fogs mostly help in widening the field of view and illuminating the sides.
  24. sd172

    What did you do to your 2015-2020 K2XX Tahoe/Yukon Today?

    I'm not sure how much these pictures will help. You can only see the internal LEDs during daytime when you perfectly level your eyes with the fog light.
  25. sd172

    What gas mileage are we getting on the 21s?

    I was getting around 20-21 real highway MPGs with the stock Michelin Energy Saver A/S tires and stock air dam. The inability to park next to the curb, occasional scraping the air dam and constant wondering ‘why does it look like a minivan’ soured the deal.

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