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Showing results for tags 'knock'.
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I've had this issue for two months but it has been minimal until recently. While going anywhere above 30mph, at around 1200rpm if I give it about quarter throttle to half throttle i will hear a clanking/knocking noise. I have recorded it with my phone but you are unable to hear it at all. The other day while merging on the highway it made the noise much worse than it ever has. I am wondering if anyone has had this before, I know some of the 3.0 DuraMax guys have had it, but has anyone with the 6.2 had an issue similar to this. I will be taking it to the dealership tomorrow.
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So, I've had this truck about 15 months. I bought it used from Carmax and ran 87 octane for the first year or so. I noticed that I got a good bit of engine pinging. It's would get worse under load or in hot weather. And during that year I always felt like the truck was a bit of a dog. In January, I'd had enough and bumped up to 91 octane for a couple months. It got much better but didn't quite go away. About 3 or 4 tanks ago, I switched to 93 octane (premium, in my area) and I don't think I've heard it ping once. The mileage hasn't changed (unsurprisingly), but the truck just feels "peppy." The throttle response is massively improved and it's a much better driving vehicle. I think the best way I can describe it is that it's no longer lazy. I mean, it's not a sports car, but it no longer needs a few seconds to get it to accelerate. I know the instant response to that is "it's all in your head" but my wife who has no idea (read: doesn't care) what's been going on commented the other day that I haven't complained about the truck's performance lately. I'm not excited about having to feed this beast premium, but if I don't I'm afraid it's going to tear itself up. Also, I haven't changed gas stations through this time and the ones I use are busy, top-tier locations so I'm not thinking the quality of the gas is involved. I'm thinking the truck was tuned by the previous owner. I'm going to ask about that at my next service visit, but I don't expect they'll tell me anything. Is there a way I can verify if the truck is on the stock tune? Also, has anyone else had a similar experience?
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Hi community, I have a 2014 Sierra 2500 4x4 with the 6.0 Gas. I've read and watched some videos about known issues with older GM transfer cases have pump knock that leads to a hole in the case. Is this an issue with 2014 2500s? Thanks for insights. Edit: I should note, have not had an issue with my transfer case at this point. Just want to know because I'm going to be taking apart the drivetran to upgrade the diffs and might as well bullet proof the transfer case if I'm doing the diff work. I've done some more digging and found that GM switched to a new transfer case 07/08, MP1226XHD. My rig has a corresponding RPO code of NQF. Does this transfer case have the issue the older NP cases have? Not alot out there about them.
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- housing pump
- knock
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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