Engines & Drivetrain

2,727 topics in this forum

1. 2014+ AFM (Active Fuel Management) 1 2 3 4 38

   By Ron.s, December 9, 2013
   • 555 replies
   • 293.5k views
   • 
   • CamGTP
   • November 13, 2025

2. 2014+ Exhaust Systems & Mufflers 1 2 3 4 204

   By Escalade1979, December 12, 2013
   • 3k replies
   • 871.8k views
   • 
   • MikeBMW
   • August 2, 2024

3. 2014+ Engine & Transmission Tuning 1 2 3 4 72

   By pendragon, July 23, 2013   

   • 2014
   • 1.1k replies
   • 462.1k views
   • 
   • newdude
   • June 21, 2023

4. 2014+ Intakes (CAI) & Air Filters 1 2 3 4 62

   By GMC-AT, September 22, 2013
   • 915 replies
   • 384.7k views
   • 
   • 16LT4
   • June 25, 2022

5. 2014+ Gas Mileage (MPG) Topic 1 2 3 4 104

   By BringTheRain403, July 21, 2013
   • 1.6k replies
   • 475.6k views
   • 
   • Grumpy Bear
   • March 22, 2022

6. Tranmission stays in Low

   By ohed, Wednesday at 03:34 PM
   • 6 replies
   • 289 views
   • 
   • davester
   • Wednesday at 08:29 PM

7. 2014 GMC Sierra 1500 w/5.3L auto, 4wd, Crank but no start, 2MPA high pressure fuel reading

   By Stacey Jaeger, June 7
   • 1 reply
   • 143 views
   • 
   • newdude
   • June 8

8. Some Good Mileage

   By TheRiver, May 25
   • 0 replies
   • 219 views
   • 
   • TheRiver
   • May 25

9. My tick is now a Knock... $$$

   By No Tyme, March 16
   • 5 replies
   • 738 views
   • 
   • txab
   • May 2

10. Can you help me regain my confidence in my engine? 2019 Yukon 5.3 1 2 3

    By BlaineBug, April 26
    • 40 replies
    • 1.5k views
    • 
    • newdude
    • April 29

11. Bank 2 confusion AIs contradict each other

    By Rogerp, April 11
    • 3 replies
    • 317 views
    • 
    • Rogerp
    • April 12

12. 4 piston Brake Upgrade 1 2

    By Razr20, February 15, 2023
    • 15 replies
    • 10.4k views
    • 
    • BackRoadZ1
    • March 24

13. 2018 Randomly Stalls and No Start - No Codes!

    By Kubs, September 3, 2025
    • 14 replies
    • 1.7k views
    • 
    • Kubs
    • March 19

14. Seeing 2 MAF readouts, wildly far apart

    By DillbroSwaggins, March 14
    • 1 reply
    • 221 views
    • 
    • CamGTP
    • March 16

15. 2015 sierra 4x4 6l80 problems

    By dhandyman, March 13
    • 2 replies
    • 323 views
    • 
    • dhandyman
    • March 13

16. Sporadic clicking sound I can't ID

    By No Tyme, March 1
    • 7 replies
    • 569 views
    • 
    • MikeBMW
    • March 5

17. First UOA on my 18 Sierra

    By ForestryGuy, February 27
    • 2 replies
    • 295 views
    • 
    • ForestryGuy
    • February 27

18. Seafoam in oil

    By countryguy1717, February 25
    • 10 replies
    • 573 views
    • 
    • Grumpy Bear
    • February 26

19. Transmission jumping out of gear while driving.

    By Mr. Remarkable, February 25
    • 1 reply
    • 187 views
    • 
    • davester
    • February 26

20. Transmission fluid change 1 2

    By M1ck3y, January 31
    • 23 replies
    • 1.4k views
    • 
    • KARNUT
    • February 20

21. Edge Insight CTS3 not showing alcohol percentage

    By Crimson6.2L, January 21
    • 4 replies
    • 419 views
    • 
    • 4RNER
    • February 20

22. 6L80E additives

    By LoganBryant58, December 30, 2025
    • 1 reply
    • 449 views
    • 
    • rav3
    • February 2

23. Cab swap

    By aktr, January 27
    • 0 replies
    • 113 views
    • 
    • aktr
    • January 27

24. 4.3 vs 5.3 1 2 3 4 9

    By Manny254, December 22, 2016
    • 125 replies
    • 93.6k views
    • 
    • Grumpy Bear
    • January 24

25. Check my thinking here.

    By Jay Ratliff, February 8, 2025
    • 4 replies
    • 804 views
    • 
    • Jay Ratliff
    • January 24