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  1. John H Daniel

    New guy with 2011 yukon xl

    Welcome... Since I have a similar truck, I'll share my experience I've had my 2011 Denali for 2 years now. Got it with 180,000, now has 200,000; alot of them towing a car hauler. I paid less knowing it was high mileage but fairly well maintained and figured I spend some money on it. So...
  2. John H Daniel

    Engine Stuttering at ~1500 RPMs

    I had similar symptom; only at slight acceleration from cruise. Tried injector cleaning, throttle body, ignition stuff... It was the torque converter. Its not too hard to diconnect the trans oil line at the radiator- assuming you don't have auxilliary trans cooler (then its even easier)- and...
  3. John H Daniel

    Loose valve seat caused bent pushrod, not AFM failure

    My mistake; I started in wrong section...
  4. John H Daniel

    Loose valve seat caused bent pushrod, not AFM failure

    I thought the AFM was enough to worry about. Now I'll be towing down the road dreading another valve seat to depart?
  5. John H Daniel

    Loose valve seat caused bent pushrod, not AFM failure

    I posted a couple of weeks ago how a trans rebuild resulted in a bent pushrod. I assumed it was an AFM failure: lifter lockup and bent pushrod. Turned out to be the intake seat coming loose. Seat holds valve off, piston hits valve and bends, valve is stuck and pushrod bends. So not caused by...
  6. John H Daniel

    Rebuilt transmission, now bent valve and pushrod

    I paid $11k a couple years ago. Even if I have to spend up to $10k between the trans rebuild and engine fix/refresh, I'm not feeling too bad. I mean that hurts; not the kind of cash flow I was planning on. But a replacement would be in the $20k range and probably wouldn't have anything rebuilt.
  7. John H Daniel

    Rebuilt transmission, now bent valve and pushrod

    They will start working on it Tuesday. If I'm very lucky it didn't score the cam, piston or other damage, but that's pretty iffy. Gonna be spendy either way...
  8. John H Daniel

    Rebuilt transmission, now bent valve and pushrod

    I posted recently about what turned out to be torque converter stutter and metal in the trans oil. I took it in for new TC and trans rebuild. After a test drive they were driving it again to set shift points etc. and got a misfire and engine codes for cyl. 4. They tried to trouble shoot it...
  9. John H Daniel

    Stumble at part throttle, no codes: It's the torque converter

    Man, that was a job! I can't imagine getting all that drivetrain back in place. I figure I've already spent enough time on the pavement/dirt/concrete under cars that I don't feel too bad about farming out the major stuff.
  10. John H Daniel

    Stumble at part throttle, no codes: It's the torque converter

    Good to know... Yeah, last couple of days, mine was requiring revs before finally engaging with a jerk, leaving a stop. I've gotten pretty bold with the rolling "stops." I don't have the resources to pull and rebuild it myself, so will go to Aamco or see if my local guy can do it.
  11. John H Daniel

    Stumble at part throttle, no codes: It's the torque converter

    Good to know... Yeah, last couple of days, mine was requiring revs before finally engaging with a jerk, leaving a stop. I've gotten pretty bold with the rolling "stops." I don't have the resources to pull and rebuild it myself, so will go to Aamco or see if my local guy can do it.
  12. John H Daniel

    Stumble at part throttle, no codes: It's the torque converter

    I went after the ignition and intake stuff many folks have done. Nothing helped. With more research, I settled on the torque converter shudder/ failing TC/ lockup clutch. I was hoping to just replace the TC, but was concerned that its failing many have shed metal particles. So I connected a...
  13. John H Daniel

    Stumble at part throttle, no codes: It's the torque converter

    No
  14. John H Daniel

    Stumble at part throttle, no codes: It's the torque converter

    198,000. I've had it last 20,000.
  15. John H Daniel

    Stumble at part throttle, no codes: It's the torque converter

    My 2011 Denali has started an annoying stumble at part throttle. So under light load, in any gear, with just enough throttle to accelerate, but not shift down, the engine will stumble/miss/hesitate. Down shift to higher revs, its smooth, no problem. I noticed it first while towing; when cruise...
  16. John H Daniel

    New Oil Pressure Sensor failed

    As noted above, I replaced the first failed AC/Delco unit with a second AC/Delco. It failed after about a month. No more OEM parts; replaced with the store brand, CarQuest. So far so good after a couple of weeks. For grins, I checked the pin to pin resistance on all of them. The AC/Delco...
  17. John H Daniel

    2012 Denali brake booster hose removal

    I just did this on my 2011 Denali. I wasn't able to get to the clamp, as you noted. But I was able to slowly work the connector out of the manifold. I had already pulled the manifold and on reassembly left off that rear plastic cover. So I could get to it pretty easily. Good luck...
  18. John H Daniel

    New Oil Pressure Sensor failed

    Round connector..
  19. John H Daniel

    New Oil Pressure Sensor failed

    Chasing oil leaks, with the help of this forum, I changed Intake Manifold and VLOM gaskets, and oil pressure sensor and screen. I found some VLOM screws were only finger tight. The first 2 you can easily reach under the IM. My 2011 Denali- 192,000 miles- has usual issues, but nothing too...
  20. John H Daniel

    infamous lifter tick 6.0L 106,900 miles

    Second the above (BG1988). Was sure it was a lifter but it was broken manifold bolts. Got those Kral gadgets and no more tick Easy to check...
  21. John H Daniel

    Trying to diagnose a top of the engine oil leak

    Following this as I have similar leaks. In my 2011 Denali w/ 192k miles. Tried a suggestion I saw on Youtube; you can reach under the front of the IM and feel 2 of the VLOM bolts. Mine are loose, so makes the decision anyway to pull the IM and replace gaskets and oil pressure sensor, etc.
  22. John H Daniel

    Help with manifold clamps

    I didn't need to go there. I just did the most rear and front on the passenger side. Its all a tight fit in the back, lol
  23. John H Daniel

    Help with manifold clamps

    Going in from the wheel wells really does improve access. When I did the motor mount for example. I'm hoping to put off the full repair of the manifold bolts till... well as long as I can. I don't know if I have the guts to try using easy outs, lol.
  24. John H Daniel

    Help with manifold clamps

    I used Kral, don't know if there is significant difference. The instructions talked about coming up from the bottom after removing the front drive shaft. I didn't want to do that, so was able to go in from the top/side. On the driver's side the 2 bolt holes are in back of the head. By far...
  25. John H Daniel

    Help with manifold clamps

    First of all, a shout out to all the help I've received from this forum. Never before a truck guy, I bought a high mileage 2011 Denali to use as a tow vehicle. I think I've fixed like four things with help from you folks. Anyway, I recently installed the exhaust manifold clamps on driver's...

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