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Showing results for tags 'Black smoke'.
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I scrolled through a few pages looking for another post on the issue with no luck, so I apologize if this has come up before. I have a 2021 Silverado 1500 Custom, 5.3L 6 speed. About 80k km on it. A couple months ago I had it parked on a bit of a hill outside my office, facing uphill. Probably had been sitting for a couple hours since I last drove it. I started it up and a big cloud of blue/black smoke came out of the tail pipes and smelled like burnt oil. Smoke cleared pretty quick and that was it. I didn't see this happen again for another few weeks, but once again, parked the exact same way as before, I started it up and a huge cloud of smoke and burnt oil smell. I had parked the same way lots of times in between both smoke shows. I haven't seen it do this since. I had it in at Chev today for an oil change and the tailgate recall and I told them about this. They had a red seal tech check it out. No signs of leaking valves, no codes thrown and he couldn't recreate it. They charged me $170 to tell me they couldn't find anything wrong except the oil level was low (but they didn't say by how much) but that it's normal for these trucks to burn 3L or so of oil every 10k km. They even had documentation from GM Canada backing that up. But just to be safe, they want to track the oil consumption and every 1000km, I have to go back to the dealership, let the truck sit for 15 min and then they check the oil level and log it. I'm in the last 20k km of my powertrain warranty so if something is going on, I want to get it dealt with before it costs me. Anyone experience something similar? My buddy suggested adding a catch can, but to also have the valves and rocker taken apart and cleaned out. This is way above my skill set and sounds expensive. I don't buy the "this is normal operation" argument because if it was, I would have seen it happening sooner. My driveway is level and I've never seen it happen when I start it at home, so I definitely think hill parking it is a piece of the puzzle.
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I have a 2005 2500hd duramax 6.6l LLy. I have been having a problem with my truck when I drive on the fwy doing over 65mph, the vehicle with go into limp mode and throws a ton of smoke. The only codes I get are for my mass air flow sensor, I've cleaned it several times and replaced it with a brand new one , and still no difference. I have a s&b intake with a S&b turbo mouthpiece, which I thought could be throwing off the mass airflow sensor, but those are the only upgrades I have on it. Cant seem to find a answer anywhere, figured I would try here. Any help is appreciated. Thanks!
