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JohnH4260

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Everything posted by JohnH4260

  1. JohnH4260
    Maybe try using a Battery Tender?
  2. JohnH4260
    Thank you for posting this update.
  3. JohnH4260
    9,089 miles on my 2021 GMC Sierra Denali. It’s been a great truck and fun to drive.
  4. JohnH4260
    I never activated my On-Star account during the 3-month trial period after initial purchase. And then it expired and I haven’t heard a word about it since leaving the dealership. My phone is my On-Star.
  5. JohnH4260
    Sorry to hear about your accident… I hope everything works out in your favor.
  6. JohnH4260
    Been using 91 (premium), since buying my truck in March 2021. Currently averaging 15-15.5 mpg around town. I disable stop-start after ignition and drive in L7 around town. So-far-so-good in terms of fuel consumption and what I was expecting when I purchased the truck.
  7. JohnH4260
    I had 3M window protection film installed on my windshield right after buying my truck. It’s been over 1 year and no problems so far. Also had it installed on my 2015 SUV and trouble free as well.
  8. JohnH4260
    Can you post a photo? Thanks.
  9. JohnH4260
    Yes, I do the same thing, drive in L3 through L9 since I purchased the truck in March 2021. Also disable the auto stop/start every time I drive. So far, so good.
  10. JohnH4260
    I’d buy a supercharged V8 if it was offered. We’ve owned a new Land Rover Range Rover Supercharged V8 since June 2015. It’s rated at only 525hp and definitely has the power to take off and move right along. And the fuel economy currently reads 18.5 mpg on the long term gauge. Only problem we’ve had was a leaking AC Freon hose that was replaced under warranty. And 8 cylinder power all the time, no Dynamic Fuel Management bullshit.
  11. JohnH4260
    It seems the 2019-2021 GM trucks (Sierra and Silverado), are plagued by two major problems. The first is lifter failure which may be attributed to DFM (dynamic fuel management), the lifters, or a combination of both. The second is a leaking rear window. If you search the forum, you’ll find information about both problems.
  12. JohnH4260
    Ordered my 2021 GMC Sierra Denali in early January 2021. It was built in Ft. Wayne, IN, and delivered to me on March 20, 2021. So far, no leak on my rear sliding window.
  13. JohnH4260
    The images below are from pages 352-354 in my 2021 GMC Sierra owners manual. In the engine compartment fuse box, it shows #60 and #67 are the Active Fuel Management 1 and Active Fuel Management 2 fuses. Maybe there’s another system involved as well.
  14. JohnH4260
    After receiving my truck in March 2021, I cut the flapper spring and fixed the valve in the open position with 2 hose clamps. A few others have done the same and posed photos on the forum. I don’t know if it has done any good, but it won’t fail.
  15. JohnH4260
    I’ve been using Costco 91 octane gas since new in March 2021. No problems so far…
  16. JohnH4260
    I used ProClip. Links below for mount and phone holder. https://www.proclipusa.com/product/213561-center-dash-mount-extra-strength/213561-center-dash-mount-extra-strength https://www.proclipusa.com/product/adjustable-iphone-xs-max-holder-for-rugged-cases/adjustable-iphone-xs-max-holder-for-rugged-cases
  17. JohnH4260
    Ordered my 2021 Sierra Denali on January 4, 2021, and it was delivered on March 20, 2021. GM discount was $5,250 so my final price was $55,650 or so. Probably could have done better, but I’m happy to have a truck.
  18. JohnH4260
    I decided to go with this mount from ProClip USA. I need it to hold my phone and radar detector. Link below. https://www.proclipusa.com/product/213561-center-dash-mount-extra-strength/213561-center-dash-mount-extra-strength
  19. JohnH4260
    Thank you for the information.
  20. JohnH4260
    I’m thinking of adding the Ram Mount Tough Track as well. Have you done this with your truck yet?
  21. JohnH4260
    For some reason seats have become firmer in newer model vehicles. My wife drives a 2 year old BMW X5 with really firm seats, more firm than in my Denali. And we also have a 2015 Land Rover Range Rover with seats a little softer than my new Denali, but not by much. I was just in Houston on a business trip and had a Chrysler 300C rental car and yep, seats were rock hard. Made the Denali feel plush in comparison. Maybe I need to invest in one of those honeycomb Gel seat cushions I’ve seen on Amazon.
  22. JohnH4260
    Just picked this up this morning at HD. Fits great and the price is right. Thank you for posting.
  23. JohnH4260
    I use a Battery Tender to keep my 2021 Sierra Denali charged. Been using Battery Tenders for all my vehicles since 1997, and have never had a problem. They do require a plug though.
  24. JohnH4260
    Yep, mine to. Any door and I hear the sound.
  25. JohnH4260
    What is a MAP sensor?
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