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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?
2014 Silverado, RALLY 4WD
orwinz posted a topic in 2014 - 2019 Silverado & SierraIssue 1: I have a 2014 Silverado 4wd rally, since I purchased this truck, there has been a rattling, pinging, from under my truck, the dealership replaced the muffler like 2 years ago and the noise is still present. Seems like when I am going up hill at 60-70 or any hill at 30-35, it clearly looses power and sounds like I need a lifter adjustment or the timing is off, but its from under the drivers side, under the bed. Service center has me pay for ride along's with a def technician who looks under the hood and changes the report and they throw there hands up and say we cant do anything if we can't duplicate my concerns. This has gone on since I've owned this truck, as a busy dad and contractor its difficult to get there. Issue 2: The truck also engages 4wd low, a chevy tech told me this was normal when traction control is engaged ? !!!! I was like what? The knob is on 2wd, the truck drops into 4wd low with no indication lights on the dash and just when leaving a parking spot or turning onto a street, I have to turn the truck off and back on to make it go away
Hi All, I have a 2015 Sierra with the 6.2/8-speed combo that I love. It has about 4500 miles on it. Shortly after my first tow experience with a camper at 2000 miles the engine started to squeak or chirp. It starts around 1200 RPM and then dies off before the next shift point. Then it starts again. It happens at all speeds, particularly on the highway while in higher gears. It is not the exhaust flapper valve as I have a Corsa cat back exhaust that sounds great. It makes the same, but more subdued sound when revving the engine in Park or Neutral. It does not make the noise when coasting or slowing down so I assume it is valve train (lifter?), AFM or exhaust related. I bought an AFM disabler (not currently mounted) and it still made the noise. It comes from directly in front of the driver, possibly behind or just below the firewall. I have been to two separate dealers. One hears it, the other cannot replicate it. The one that hears it says nothing appears wrong so they will not pursue it further. This is fine until something fails with a 7000 lb trailer on the hitch in the middle of Missouri. Does anyone any any experience with this kind of noise? Here are some videos. Crank the volume and listen for a squeak or pinging sound. Thanks!!! https://www.youtube.com/channel/UCY3JvgK15Ff7dNkfOUJDXGg
2011 5.3L pinging
GM_driver posted a question in Ask the GM TechnicianHey guys, Recently my 2011 silverado with the 5.3L has begun pinging under load at around 2000rpm. Here is a list of things I have done already: 3 bottles of Lucas Oil Deep Clean though fuel tanks(3 tank fulls) 1 bottle of Chevron Techtron concentrate (half tank full) new air filter cleaned MAF sensor cleaned throttle body Used AutoCal to read spark advance during pinging event; minimum advance was 18* during pinging (pinging does not stop unless I change throttle position) Note; I have a Blackbear tune. I now believe it is a faulty knock sensor since the pinging does not stop after a few seconds. This started happening after I had a low oil pressure sensor voltage DTC. I brought it to the dealer and they replaced the oil and oil filter with a UPF48 claiming the PF48 already installed on the truck was faulty. It seems to have fixed the low oil pressure issue. I would like your opinions before I decide to take it back to the dealer. Thanks