whynott65

It sounds like going the full AFM/DOD delete makes the most sense long-term. Do you guys think its ok to leave the lower engine alone as long as I don't see anything obvious once the heads are off?

Hi everyone. I just joined this group after searching for help with my issue on Google. This was the first one to pop up, so you guys must be the best! My issue started yesterday with my 2010 Yukon XL Denali when I was driving. All of a sudden there was a noise and the truck hesitated for split second and then started ticking. The Stabilitrak was disabled and the check engine light came on. Oil pressure seemed unchanged. Since I was only a couple miles from home I kept driving, but kept an ear out for the sounds to try to diagnose what the issue was. After a little bit the check engine light went off, but the tick remained and seemed to follow the rpm to the engine, so it I assumed it wasn't related to the driveline. Got home, parked the truck and started researching the potential problem. The codes that were stored were P0306 for Cylinder 6 Misfire and P219B for Fuel Trim Cylinder Balance Bank 2. From the searching here I assumed it could be a valve issue, so I took off the passenger side valve cover and watched the rockers while cranking. One rocker on cylinder 6 was moving, but not like the others. I uploaded a video of a few seconds, so I hope you can see it. So, it seems I have an issue with the valve. Do you all agree that is where to start? What would you recommend I do to fix the issue? At 181k miles should I go all out with the engine and eliminate the AFM/DOD? Pull the engine and go through it all? I guess there are really two main questions: 1.) What do I HAVE to do to fix this? 2.) What SHOULD I do to keep the truck going long-term? I have decent skills and a desire to tear into things to learn, but I don't have much diagnostic knowledge, so I'm always looking for forums like this or videos to help figure things out. Thanks for taking the time to read this. I really appreciate any advice you may have! IMG_1011.MOV