12-13-2020, 10:54 AM
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#9
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Drives: '20 ZLE
Join Date: Jun 2020
Location: Mile High
Posts: 3,559
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Quote:
Originally Posted by Sindri
I have a brand new 2021 1SS 1LE that I picked up Nov. 30th and I'm already having an issue. I've been driving the car every day since I got it, and am doing my best to follow the GM break in procedures - not dogging it or thrashing, varying RPM, keeping it under 4,000, etc. I mostly drive it in Sport mode, but have used it in Touring a few times. I feel like I've got a pretty good handle on how the car feels and the noises it should be making.
Well last night I was turning into my neighborhood and I heard a very sharp, distinct noise, like a sudden bang/pop, and then the car was louder. The only way I can describe it is like a hole suddenly appeared in my firewall and I was hearing more wind/road/engine noise coming from that area.
Today I took a look under the hood, my first thought was the sound tube became damaged/disconnected, but it seemed fine. I also looked under the car for anything that was damaged/dragging but didn't see anything.
I took it out for another drive today, and the noise is still there, and seems like it's getting worse. I usually run in Sport but switched to Touring and it's even more apparent. I've also noticed that there's some more vibration in the clutch/shifter and in the bottom of my seat. I also am detecting a sort of clicking/grinding noise that seems to be proportional to engine RPM. I'm familiar with clutch chatter in multi-plate setups but this seems somehow different/worse.
My first thought is something transmission related owing to the vibration in the shifter/clutch area. The other thing I'm thinking is something exhaust related, maybe a leak up near the header or cat? It's obviously still under warranty, so I'll end up taking it to the dealer and letting them address it, but I always like to do my homework before turning my car over to someone.
I'm just curious if anyone has experienced something like this. I find it helpful to be able to show up to the dealer with a list of symptoms and possible explanations.
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Don't drive the car. Broken valve springs cause excessive valve noise, compression loss and can cause severe internal engine damage. The actual breaking of the valve springs is not always the most serious consequence. Actions following the breaking cause the most serious damage to the engine. When spring breaks, it may collapse just enough to allow the valve to drop into the cylinder, where the piston may strike it. In addition, the valve stem locks or keepers may release the valve and allow it to drop into the cylinder, causing severe damage to the piston, cylinder head, and other nearby parts.
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'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650.
100+ octanes, no eth, no meth, no N2O.
2/23 - 1031/1004 wheel.
4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes).
2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next.
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