Engines & Drivetrain

2,730 topics in this forum

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

   By Ron.s, December 9, 2013
   • 555 replies
   • 294.2k views
   • 
   • CamGTP
   • November 13, 2025

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

   By Escalade1979, December 12, 2013
   • 3k replies
   • 875.3k views
   • 
   • MikeBMW
   • August 2, 2024

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

   By pendragon, July 23, 2013   

   • 2014
   • 1.1k replies
   • 463.6k views
   • 
   • newdude
   • June 21, 2023

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

   By GMC-AT, September 22, 2013
   • 915 replies
   • 386k views
   • 
   • 16LT4
   • June 25, 2022

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

   By BringTheRain403, July 21, 2013
   • 1.6k replies
   • 477.1k views
   • 
   • Grumpy Bear
   • March 22, 2022

6. No low range 4 x 4

   By dna9656, yesterday at 05:37 AM
   • 1 reply
   • 68 views
   • 
   • rav3
   • 18 hours ago

7. Cam chain tensioner question

   By B14Sierra, 23 hours ago
   • 0 replies
   • 66 views
   • 
   • B14Sierra
   • 23 hours ago

8. 2014 - 2018 Chevrolet Silverado/GMC Sierra

   By Hdwrguy, June 22
   • 1 reply
   • 164 views
   • 
   • mikeyk101
   • June 22

9. Transmission jumping out of gear while driving.

   By Mr. Remarkable, February 25
   • 2 replies
   • 253 views
   • 
   • JimCost2014
   • June 22

10. Tranmission stays in Low

    By ohed, June 10
    • 6 replies
    • 424 views
    • 
    • davester
    • June 10

11. 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
    • 164 views
    • 
    • newdude
    • June 8

12. Some Good Mileage

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

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

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

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

    By BlaineBug, April 26
    • 40 replies
    • 1.6k views
    • 
    • newdude
    • April 29

15. Bank 2 confusion AIs contradict each other

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

16. 4 piston Brake Upgrade 1 2

    By Razr20, February 15, 2023
    • 15 replies
    • 10.6k views
    • 
    • BackRoadZ1
    • March 24

17. 2018 Randomly Stalls and No Start - No Codes!

    By Kubs, September 3, 2025
    • 14 replies
    • 1.8k views
    • 
    • Kubs
    • March 19

18. Seeing 2 MAF readouts, wildly far apart

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

19. 2015 sierra 4x4 6l80 problems

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

20. Sporadic clicking sound I can't ID

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

21. First UOA on my 18 Sierra

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

22. Seafoam in oil

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

23. Transmission fluid change 1 2

    By M1ck3y, January 31
    • 23 replies
    • 1.6k views
    • 
    • KARNUT
    • February 20

24. Edge Insight CTS3 not showing alcohol percentage

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

25. 6L80E additives

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