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Found 12 results

  1. Anyone else have multiple issue regarding the lifters? I purchased a demo truck with 3900 miles on it back in early May. Started having engine issues almost immediately and had gotten all my lifters replaced recently, with under 7,000 miles on the truck. Spent almost a month at the dealer and finally got it back. They replaced all the lifters the first time and then a few weeks later it started having issues again. Luckily with the market conditions today I was able to trade out and get a newer one but I gotta admit I'm concerned. Anyone else dealing with this issue repeatedly?
  2. I have read hundreds of AFM collapsed lifter threads but have not been able to find someone with my same issue where it has been solved. Looking for your expertise in the cause, not looking for advise to turn AFM off as that is the plan but I want to properly fix the issue first. I have a 14 Silverado with a 5.3 with 50k miles and the issue I’m having is there is a pecking/knocking/rattle only when the truck is under light load while it is in V4 mode. Has anyone else experienced this where the noise occurs only while in V4 and while slightly accelerating? The are no check engine lights, no noises at idle, no noise while running on 8 cylinders, no smoke, no oil usage, and it doesn’t appear to have lost any power. The two possible problems I see are either: 1. One of the AFM lifters have failed in a way where it is not allowing the cylinder to deactivate which means the intake or exhaust valve will function like normal instead of closing during V4 mode. If this is the case is there any way to confirm this without a diagnostic scanner to put the truck in V4 at idle or to deactivate each cylinder? Is there any risk of further failure by not fixing this if I turn off AFM as it seems the “tabs” are just not disengaging within the lifter? 2. There is an issue somewhere within the VLOM portion with an actuator, oil port, something electronic that is preventing enough oil pressure to deactivate the lifter. If AFM is deactivated is there any risk with whatever is not working properly within this system? Basically, I am fine with turning AFM off as where I drive there is likely minimal impact but I don’t want to turn it off just to cover up a problem that will resurface in the near future as I don’t intend on getting rid of the truck any time soon.
  3. Thought I’d share what’s going on with my 2012 6.2L Yukon XL. Warning its long, but perhaps it will help someone with the same issues. The short & sweet: L94 6.2 AFM motor with cold start noise. Lifters were replaced prior to our purchase about 9 months ago, and this week my dealer replaced the camshaft & lifters noted camshaft damage. Videos of noise before and after below. There is still a noise after the repair, piston slap - and would you say normal? The detailed story. Purchased 9 months ago in North Alabama. 2012 Yukon XL Denali 6.2L (L94 with AFM) AWD. 1 Owner, 89,897 miles. Apparently at 89,741 (2 months prior to purchase) the lifters were replaced under powertrain warranty, no evidence the camshaft was replaced at that time. I purchased it without that information provided. But no problem, it was running smooth at the time, warm spring Alabama temps. My dad works in parts so had a friend pull the RPO codes & transaction history for the truck, thats how I found out about the lifter work. I did a clean up oil change right after purchase then swapped to my AMSOIL batch on hand. Fast forward to November 2015 timeframe. The nights are getting cooler, and I start to notice the noise at cold starts. The noise disappears once the motor warmed up, and I mean FULLY warmed up. It would clatter for 15 miles to town. I started researching and found TSB & lots of reports of lifter noise, piston slap common with these motors. I honestly wasn’t sure which it was so I laid out my plan to try and eliminate the lifter noise possibility since it was just repaired. From the start of November I completed 3 oil/filter changes. I downgraded from my AMSOIL filters and oil to ACDELCO filters and whatever Dexos oil I could get my hands on. I removed the intake manifold and did a good cleaning of the manifold and intake valves (added a nice catch can as well). I replaced the oil pressure sending unit and the little filter (it was clean but had to check). I removed the valve covers and removed each rocker, cleaned each pushrod with a pushrod brush & B12. I then sprayed a little B12 through each pushrod onto the lifters. Then poured fresh oil over the rockers to prevent dry start. All looked good internally from the get go. After the cleaning & immediate oil change the first start up sounded good! I honestly thought some contaminates just got in the lifters and the cleaning helped. In hindsight the temp was around 60 so the sound was probably just muted. The next day a cold morning, the noise was back. Now even more of a shrill at times with any acceleration. The holidays hit and delayed my trip to the dealer. So last Tuesday I dropped it off at the dealer with 97100 miles. I simply told the service lady it had a bad cold start noise with a prior history of motor work before our purchase & to please have it left outside overnight for a cold am start. The next day she called to say the mechanic has ordered a camshaft & is trying to find out from the previous dealer if the camshaft was ever replaced. Would take a week to repair under powertrain. I had him replace the oil pump & water pump while he was doing the surgery at no extra labor cost. Picked the truck up last night. The mechanic stated he could not find any evidence that the prior dealer replaced the camshaft only the lifters at 89,741. So he replaced both the camshaft & all lifters again. Stated he did find camshaft damage & not sure if it occurred before my purchase or not since it wasn't replaced. He said the motor internally looked real good for one of this millage & the pistons were rather clean (he speculated they had carbon knocked off during its last tear down). So now, the next morning, the temp is 30 outside. I start it up and it has a similar noise to what I brought it in for. It still continues to tap for a good 15 min of driving. Piston slap? I'm hoping this is just the normal noise & we can go on for another 10 years with no major tear downs. Please set my mind at ease. Thanks!
  4. I have a 2015 Silverado with the 5.3L that just had the number 7 lifter collapse.... Just normal acceleration and lost power. Sounds like this is a common issue with the AFM engines... I took it in to the Chevy dealer and they want way too much to replace the lifter and check the cam for wear. Of course, my warranty was done 20k ago at 160k so I'm wondering what are my best options. Does it make sense to repair and hope nothing else goes wrong or spend the money on a new or salvage engine with low km and pay to put that in?? I'd like to keep the truck for a long time if possible. What would you do in this situation?
  5. Hi I have a 2007 Yukon that only starts ticking when I am parked at idle for 5 to 10 min,,,starts then gets loud. Once I rev the engine or start driving it disappears....Had the whole top of motor redone 3 yrs ago by a dealer.....Broke now and wondering if maybe have someone shut off the afm could possibly stop it being it only happens when I am idling
  6. Hi I have a 2007 Yukon that only starts ticking when I am parked at idle for 5 to 10 min,,,starts then gets loud. Once I rev the engine or start driving it disappears....Had the whole top of motor redone 3 yrs ago by a dealer.....Broke now and wondering if maybe have someone shut off the afm could possibly stop it being it only happens when I am idling
  7. Ok so here is my problem! I'm new here so hopefully I can get this rite lol!! I have a 2004 suburban 5.3 vortec 2wheel drive! 170,XXX miles on it. I've owned it for about a year now. Always took care of it. Truck is very nice and well kept up! So here is my issue. I was sitting in my buddy's driveway last nite talking for a min when I noticed a knock coming about! I mentioned it to him but we thought maybe it was just the AC compressor or something.( Noise was light at this time) so we think nothing of it continue to talk and I noticed it getting louder! So I get out and I swear it was a rod knock from in pan so I leave go home (about a mile away) shut it off stop for the night and tow it to my shop this morning... I drop the pan pulled all rod caps and checked the bearings then pulled all the main caps and checked those as well!! THEY LOOK GREAT! so now I go to the oil that I drained out of it prior to dropping the pan there is gold flakes of metal in my oil! So I keep looking to find that looking up between the crank I can see the cam shaft and I can see a lobe is shot!! So now I'm gonna put lifters and a new cam.... Now here is my question where did the gold flakes come from? As far as I know gold flakes are from a bad bearing correct???? But I don't have a bad bearing I have a bad lobe on my cam and a bad lifter!!! Would the bad cam lead to a bad cam bearing?? HELP ME PLEASEEEE
  8. Hey all! Hope everyone is having a wonderful Monday morning. I’m reaching out to y’all because i purchased my 2014 Silverado 5.3 used, with 76k highway miles. From purchase, it had a decently loud engine, which after reading some posts about direct injection and the oil delivery of these engines, thought it was normal. But after comparing engine sounds to other 2014-2016 5.3 engines, I’ve come to the realization that my engine is obviously not operating the way it should be. My transmission acts up a bit, but that’s GM transmissions... I’ll have it checked out when I take it for a warranty service. Anyways, I wanted to hear what you guys think on this topic. I can’t seem to figure out what the whining is from, and why it’s incredibly quieter on other trucks. Maybe my (part that produced the whine) needs to be replaced? I don’t know what it is. My starter grinds sometimes and it’s a nasty sound, but I heard starters aren’t covered under warranty. Then, I noticed, if I get on the pedal and let off, there’s a chirp...I have no freakin clue what that is, so any insight on that helps. Next up is my lifters. I have to definitely get new lifters, and I heard that the lifters go bad after many miles thanks to the B.S. AFM. Once I get the full service I’ll be tuning out the AFM. Then, finally, is my driveline. I get almost like a “clunk” somewhere along the driveline towards the end when I’m coming to a stop, and going... I think it might be my UJoint. Thank you guys for any input you leave, it’s greatly appreciated.
  9. Hey guys I’m new to the forum but I’ve been a long time subscriber since I bought my 14 Sierra new in feb 2014. So I’ve read lots of horror stories on the site and I thought I’d tell you guys about my experience. A few weeks ago over 5r holidays, my girlfriend and I were returning a uhaul after moving and she was following in my truck, she called to say that the check engine light was on and the truck had reduced power. We dropped off the uhaul and I hopped in and could tell it was misfiring and had a rough idle. I took it to my local mechanic and he told me cylinder 4 was misfiring and he tried a coil pack but that didn’t fix it, he did a compression test and it was holding compression but he told me this was gonna be a bigger problem. luckily I still had powertrain warranty so I contacted the dealership that I bought the truck from and they had me tow it there using gm roadside. So my first hats off to gm, the lady I had on the phone from roadside assistance asked her manager to waive the tow fee as I was having it towed to my home dealership that was > than the 50 miles that they cover for free. Once the truck made it to the dealership, it only took the. A couple of hours to figure out I had a failed lifter and broken rod for cylinder #4. Now I was freaking out because I’ve read horror stories on this site about having to argue with regional managers for warranty work this significant and I’ve heard dealerships arbitrarily saying work isn’t covered under warranty for whatever reason. Thankfully I can say my service advisor set me up with a rental the same day and reassured me that everything would be covered by gm. He did say parts were on backorder and it would take approx 2 weeks. Almost 2 weeks to the day, truck was ready to be picked up with 0 hassle the entire time. This is my 3rd truck with the 5.3 and the only time I’ve had a significant mechanical issue. The truck only had 85000 km (around 50k miles) sure I was PO’d that my truck was out of commission for 2 weeks but I was extremely thankful that gm stood behind their product and was able to fix the truck for me. The truck seems to run fine now but I don’t know if I will keep it as I don’t know if it will be the same or if the issue will reoccur. I do know that my next truck will definite be another Chevy or Sierra. I can’t wait to see the reveal of the new Chevy this weekend at Detroit! Jut thought I would post a positive warranty repair story and throw a kudos out to gm for making things right with me
  10. Hey everyone, I have a 2014 Sierra with the 5.3L, I really don't like posting on the forums for issues because it can give a bad representation of what is generally a good vehicle. My truck never really exhibited any of the usual issues like the vibration but it has had a couple small fixes here and there. Moving seat, rusting frame, etc. this time I just wanted to give everyone the heads up. Well a couple months ago I was driving and the oil pump failed. It took 2 weeks to fix. When it happened I was pretty concerned about any possible damage it caused but the dealer said it looked ok. Fast forward to last week. Merging onto the highway, heard a pop and lights came on everywhere. Got it to the dealer, lifters collapsed on a cylinder. I was without my truck all last week as they fixed that issue. This sunday, less than 60 miles after I picked it up, I went to accelerate in town and heard the same pop but this time it wouldn't even move if I gave it throttle. Towed it down to the dealer and they finally looked at it yesterday. This time they are ordering me a brand new engine. Thankfully I still have powertrain warranty but this is a major disappointment and honestly I don't even trust the truck anymore. What would your recommendations be? Sell it, trade it, keep it and run it into the ground?
  11. If it is a lifter, what kind of lifters should I get for a 05 GMC 2500 HD with a 6.0 vortec? This video shows whats goin on. More to come as the information becomes available.
  12. I've got a 2006 Saab 97x with a 5.3L Vortec engine with 110K miles (yes, I know its not a truck but this forum seems to have the most knowledgeable folks on board). Out of the blue, it started ticking badly at the front of the left rocker cover. It sounds exactly like the Sierra in this video: I pulled the cover and found that the first rocker is loose and has about 1/8" play - in other words, the valve spring is not taking up the slack. The push-rod and rocker arm are not damaged. Temporarily swapping the rocker from another valve did not get rid of the play. The first question: Is this a sign of a "collapsed" lifter or "stuck" lifter? What's the correct term here? The Big Question: Is there any chance of fixing it with a healthy dose of Chemtool or Marvel Mystery Oil down the push-rod and into the lifter followed by an engine flush? That's what the guy did in the video and it cured the lifter problem. Unless someone states I shouldn't, I'm going to try the above treatment. If that doesn't work, is there anything else to try before ripping off the head? Should I replace all of the lifters, both sides? TIA for your help!
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