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09-10-2021, 11:43 PM
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#15 | |
         
Drives: 2018 Hot Red ZL1 Join Date: Nov 2010
Location: Los Angeles, CA
Posts: 3,599
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I am quite sure it is the secondary cats making the noise. Maybe they are going bad? They did mention the cats have a longer warranty. I suppose more incentive to get long tube headers and high flow cats?...!! I did some more driving today. If i accelerate at a nor.al pace thru the gears, no noise. The noise only happens if I stomp the gas pedal and the superchargers engages. The noise goes away after 3k RPM.. it is seriously noticeable if I skip shift from 1st to 4th and accelerate harder than normal. I am at a lost now until I get headers and see if that changes. Maybe it is the exhaust leak i have on the x pipe making noises and the sounds travels towards the cat? I am getting a new x pipe and mufflers on Tuesday . We shall see. I am so over this car.. issue after issue.. i am getting to the point of getting ready to sell...
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09-11-2021, 08:50 AM
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#16 |
 
Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016
Location: Georgia
Posts: 5,813
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Hopefully the new parts will straighten out the problem. Hang in there with the ZL1. It’s an awesome Camaro for the money.
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ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.
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09-11-2021, 03:35 PM
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#17 | |
Drives: 2019 ZL1 Join Date: Mar 2019
Location: NJ
Posts: 1,534
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Maybe the wife left her vibrator on in the trunk? Just a thought..
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928rwhp - 93 | 1040rwhp/898rwrq - E65 SAE
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09-11-2021, 08:42 PM
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#18 |
 
Drives: 18 ZL1 - M6 Join Date: Mar 2019
Location: MI
Posts: 440
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09-12-2021, 12:50 AM
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#19 |
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Drives: 2018 Hot Red ZL1 Join Date: Nov 2010
Location: Los Angeles, CA
Posts: 3,599
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Lol .. thanks guys.. i guess with the radio on, i can't hear anything
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09-15-2021, 10:02 PM
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#20 |
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Drives: 2018 Hot Red ZL1 Join Date: Nov 2010
Location: Los Angeles, CA
Posts: 3,599
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New Xpipe and mufflers are in. Buzzing still there.. oh well.. it is what it is. I have other more important things to deal with in this car so that will be dealt with later
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11-30-2021, 12:40 AM
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#21 |
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Drives: 2018 Hot Red ZL1 Join Date: Nov 2010
Location: Los Angeles, CA
Posts: 3,599
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Does anyone think the buzzing could be one of the front cats having internal structure breakdown? Is there a way I can check the condition of the inside of the cats without removing them?
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11-30-2021, 09:20 AM
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#22 |
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Drives: 2023 Black ZL1 Auto Join Date: Oct 2009
Location: FEMA Region 4
Posts: 2,935
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You might need to find a set of chassis ears to attach under the car in areas to isolate the noise. If it doesn't make any noise in park or brake torquing it, then I can't think of another way to pinpoint where it's coming from.
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11-30-2021, 09:33 AM
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#23 | |
  
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,606
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Quote:
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
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11-30-2021, 10:05 PM
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#24 |
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Drives: 2018 Hot Red ZL1 Join Date: Nov 2010
Location: Los Angeles, CA
Posts: 3,599
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Noise only happen under load at certain low to mid rpms.
I swear that it is coming from right under the area where the cats are. I have tried to smack the heat shields but I don't find anything loose... My second cats were replaced under warranty since my xpipe was leaking so I know thatd not the problem.. Maybe the front cats? I will eventually plan to run headers and hi flow cats so I have been like whatever but it just really pisses me off lol.. though this car has taught me to be more accepting and letting go of the minor stuff and enjoy what I have. Sent from my moto g(7) power using Tapatalk
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