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Philbert

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Everything posted by Philbert

  1. Back from a new dealer, after the last damaged my car and repaired it without my knowledge, I refused to take it back to them. New dealer found a misfire code on the same cylinder as the failed lifter, and replaced the spark plug. After the lifter failure, plugs never replaced nor were they replaced on subsequent visits. This is visit #4 for engine failure since August and just a little over 1k miles since original failure at 4700 miles. Misfire at idle is essentially gone, however shake/misfire still prevalent on light acceleration. I notice it all the time when warm. After a hard acceleration to pass or accelerate to get on the highway, then relax and maintain a speed while just applying just a little gas or coasting. I'll drive it around for a bit to get all monitors back up and hopefully another code will pop up to lead to the problem
  2. Picked up the vehicle after it spent a week at the dealership. They replaced a valve cover gasket for the leak. second time they replaced a valve cover gasket. and said as far as the shake is concerned, it's a normal characteristic of the 6.2 and mine is better than most. Blowing smoke up my a$$. I'm going to have an outside shop diagnose the issue and pursue lemon law. I'm done with this POS. 70k dollar pos. It's a shame.
  3. Nope. I Spoke to the dealer last week and they gave me a song and dance about being down techs. Yada Yada Yada. And to bring it in October when there is a full crew. Also said he would set me up with a loaner, called yesterday and no loaner available until November. I'm just going to drop it off and we will make due with one car. Spoke to a lemon law attorney and have one more attempt or 14 more days out of service. I think that's the route I'm going to have to go. It's a shame as I used to really like my truck.
  4. Thanks for the heads up. I took it on another medium distance drive and started feeling it again. I also started smelling burning oil again , looked under the car and it's still leaking. I'm so disgusted at this point. 5300 miles. 8 months old.
  5. I understand I have something else going on, more than likely a valve is not seated properly or camshaft lobe was scored ever so slightly after the lifter collapsed causing my symptoms. Especially given the fact that the vehicle is not driving the way it did before all 16 lifters and the bent pushrod were replaced. Some others are also experiencing what I am and are not getting satisfactory answers from GM. They will not address the issue because there is no CEL. I'm going to be shopping for a ford or dodge this weekend and see if I can get out without taking a hit. If not I will become the squeaky wheel at the dealership until it's fixed properly or hire an attorney and pursue lemon law. It's a shame as I used to really like the truck.
  6. I wish this was true, however the vehicle will more than likely idle rough and hesitate slightly on acceleration as does mine . GM will not acknowledge it and want you to drive it until it breaks. This is my case at least
  7. Still have a slight vibration but better than before and idles much more smoothly although not like it did before the repair. I will drive it around and see what happens. I'm thinking it damaged the camshaft ever so slight but no codes so dealer won't address.
  8. So I received a call from the dealer, intake manifold was cracked, valve cover gasket rolled (oil leak) and ecm was reprogrammed. Funny thing is , when I got the truck back the first time, I said to myself, it feels like a vacuum leak. I'll let you know if it's fixed when I pick it up. If so, I would have the dealer check for vacuum leak at the intake. They are doing so many of these, I wouldn't be surprised if the technicians aren't torqueing the bolts to spec to save time and just torqueing them RFT (lol)
  9. Vehicle has been at GMC for the last week. Had the lifters and a bent pushrod replaced 500 miles ago and now getting the same vibration as light acceleration or coasting. My case is very slight. Dealer is saying they are not finding a problem. The most obvious issue I've felt is a very rough idle. The truck has always been smooth as glass at idle,but after the repair, it shakes like an old 454 progressively worse when warm. One week without a truck or loaner is getting really old
  10. Back in the shop, after all lifters and a bent pushrod were replaced I picked it up and started shaking badly at about 40 mph and on light acceleration or when coasting. Was able to get it home, called my local dealer who said no appointments until 9/20 or drop it off and they will get to it when they do. Continued driving it as it wasn't horrible and no check engine light until I started smelling burning oil. Look under the hood and see oil pooling on the the intake manifold dripping down onto the exhaust manifold. Didn't have a choice but to drop it off at the point. Now waiting 5 days as it's a holiday weekend to be looked at without a loaner. Take as long as you want to repair it, once it reaches a total of 30 days I will get and attorney and proceed with lemon law. GM is useless and their " senior rep" never picks up her phone. Horrible customer service.
  11. Had a Borla Atak crate muffler installed. Sounded great initially. Horrible drone at highway speeds got louder after about 1k miles. Replaced with a Corsa Sport cat back. Love the sound.. Whisper quite at highway speeds, decent rumble on acceleration and cold start. 1300 on CSPracing and well worth it.
  12. Unfortunately your ignorance is showing. Onstar has always claimed to be a concierge service when an emergency arises. Please do some research prior to replying, and only add intelligent, beneficial replies.
  13. I agree with this to an extent, as I was a service manager for an AAMCO. However, the biggest issue I have with this particular issue is it has been known for about 1 year. GM has known about this and was either sending this truck out because there was a part supply issue , and valued profit over reliability or they have no clue why the lifters are collapsing. Either way, not good GM.
  14. That's what was said almost a year ago. Then it was post October 2020. Have a 2021 sierra 6.2 with the same issue as the original poster and mine has a build year build 12/20. And unfortunately it is the same exact situation and onstar was no help. Had to limp off the interstate, an uber for my family and I over to a rental agency and then meet the tow driver at the dealer to grab my stuff out of the vehicle and continue on my way to vacation. I thought I paid 50 dollars a month for onstar to be my concierge. Instead I had to figure this all out myself while dealing with a new car with serious issues. I lost all faith in my 70k truck and onstar.
  15. I am sure it is due to the size in the muffler. I had an atak muffler welded in and initially not horrible but after about 500 miles it droned so bad on the 6.2 that it gave my 8 yo car sickness . Went with the Corsa sport and will not look back. No drone AT ALL. Unfortunately it is in the shop with 4700 and I think it has the dreaded valve issue. Happened on the interstate 600 miles from home, but that's a post for a different forum
  16. I hadn't heard it again after that one time. Still hadn't brought it to the dealership. Truck is 4 months old and only 2300 miles including a 1000 mile trip to buy it. I will update once I have the energy to bring it in.
  17. Mechanically, I can not see how it could cause a vehicle to run lean as there are no sensors after the muffler.
  18. How would it cause the vehicle to run lean if the pipe is after the sensors?
  19. Mine also looked similar, I bought it 1 month ago. The rail seals were also torn and the inside of the cover was scratched. I wound up returning and ordered a bak mx4 designed specifically for Carbon Pro bed. Had to be made and shipped direct from the manufacturer. I should be getting it on Friday. 1 month after ordering. I'll update with the quality.
  20. Finally had a Borla atak muffler installed today. FLAP REMOVED. It definitely is louder and sounds like a v8 and magically the annoying rattle is gone. One of the advantages of removing the flapper.
  21. Haven't brought it to the dealer yet. I'll keep you posted when I do
  22. If I switch to a Borla attak muffler only swap. Shoul the Flapper be removed or left in? AT4 6.2 2021
  23. You should hear the territory MT tires on the AT4 carbonpro. I wonder if I replace just the muffler with a borla attak and keep everything else on the exhaust stock, will I hear it over the tires?
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