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11-30-2020, 10:48 AM
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#1 |
 
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Engine noise
Hey folks, just recent I heard this noise coming from my engine. I have some mods on the car and considering those, this noise was loud. It does go away after a few minutes or when the car warms up. It is a 2015 SS. Any thoughts on what it is?
Mods - tsp headers, CAI, Catch Can, X-pipe. https://youtu.be/bzwilfPvKhs
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 MODS: VARARAM CAI, Catch Can, 1 LE front/rear sway bars, engine cover/fuse box custom painted, strut tower brace, Texas Speed LT, Hi Flo Cats, Magnum Tru-X pipe, NGK Spark Plugs, PCM Spark Plug Wire, Painted Calipers, CF Spoiler w/wicker bill. |
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11-30-2020, 10:59 AM
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#2 |
 
Drives: 2015 zl1 Join Date: Jan 2020
Location: Anchorage
Posts: 161
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I’d start by checking my pulleys . Have you’ve taken the belt off and spun your pulleys ?
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11-30-2020, 11:07 AM
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#3 |
         
Drives: 2011 SS-RS Join Date: May 2011
Location: FLORIDA
Posts: 3,244
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Sounds like a vacuum leak to me, my Mustang did that same whistling thing when I installed a custom intake adapter on it, didn't seal properly.
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TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200 CONVERTER,LOD INTAKE. 486RWTQ/475RWHP.LOTS MORE.
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11-30-2020, 11:11 AM
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#4 | |
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Quote:
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MODS: VARARAM CAI, Catch Can, 1 LE front/rear sway bars, engine cover/fuse box custom painted, strut tower brace, Texas Speed LT, Hi Flo Cats, Magnum Tru-X pipe, NGK Spark Plugs, PCM Spark Plug Wire, Painted Calipers, CF Spoiler w/wicker bill. |
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11-30-2020, 11:15 AM
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#5 |
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Drives: 2015 zl1 Join Date: Jan 2020
Location: Anchorage
Posts: 161
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I was thinking vacuum leak too but it seemed that your car idled fine . Right ? No cel?
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11-30-2020, 11:40 AM
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#6 |
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Drives: 2011 SS-RS Join Date: May 2011
Location: FLORIDA
Posts: 3,244
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Yea my Mustang idled fine too, but buy was she screaming!!
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TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200 CONVERTER,LOD INTAKE. 486RWTQ/475RWHP.LOTS MORE.
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11-30-2020, 11:55 AM
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#7 | |
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Quote:
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MODS: VARARAM CAI, Catch Can, 1 LE front/rear sway bars, engine cover/fuse box custom painted, strut tower brace, Texas Speed LT, Hi Flo Cats, Magnum Tru-X pipe, NGK Spark Plugs, PCM Spark Plug Wire, Painted Calipers, CF Spoiler w/wicker bill. |
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11-30-2020, 12:07 PM
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#8 |
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All previous suggestions are great. My $.02, check idler pulley bearing or such. Bearings can scream at you like that as well. Seams that the noise got louder near idler pulley, but it’s tough to tell as vacuum leak is as also a good suggestion.
Good luck |
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11-30-2020, 04:37 PM
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#9 | |
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Drives: 2015 zl1 Join Date: Jan 2020
Location: Anchorage
Posts: 161
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Quote:
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11-30-2020, 06:28 PM
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#10 |
 
Drives: 2015 Camaro SS 1LE, 2014 Chevy SS Join Date: Sep 2020
Location: Florida
Posts: 63
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I was thinking vacuum leak as well.
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11-30-2020, 06:31 PM
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#11 |
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Drives: 2015 Camaro SS 1LE, 2014 Chevy SS Join Date: Sep 2020
Location: Florida
Posts: 63
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You can try spraying some some throttle plate cleaner around the intake manifold and hoses and see if idle changes to try and narrow it down. If it is a vacuum leak.
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11-30-2020, 08:53 PM
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#12 |
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Evil Genius of Chevrolet
Drives: 2013 Camaro 2SS 2015 LaCrosse Join Date: Feb 2017
Location: New York
Posts: 2,228
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Easy way to find a vacuum leak........ take a big fat cigar and blow the smoke through a vacuum line. If you got leaks it's pretty obvious lol. Works everytime.
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GPI SS2 VVT cam, ECS Novi 1500 supercharger, 8 rib belt, Cam phaser, Corsa exhaust, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI Superdamper, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Speed Engineering headers, Stainless Works HF cats, and much more.
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11-30-2020, 09:58 PM
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#13 |
Drives: 2010 CGM 2SS LS3 Swapped A6 Join Date: Sep 2016
Location: Spring Hill, FL
Posts: 3,879
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Holy crap! Grab a defibrillator, she flatlined! Wow, that is really loud.
That does sound like it could be vacuum related as said above. Either a leak, failure, or clog of one of the vacuum related parts up front, ie. evap, PCV system, or something that can create a sort of a 'whistle' if clogged just right. No CEL codes eh? Hopefully it's something easy to replace like a idler pulley. Does it change pitch with rpm? If you disconnect a vacuum hose does it change tone, volume, or pitch? Let us know what you find.
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2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4) on CamMotion 8620 core, BTR Platinum .660" Dual Spring kit w/titanium retainers, CHE bronze trunnion upgrade, stock heads milled @ .015, Melling HV 10296 oil pump, TSP long tube headers (W/Catless Off-road Pipes), FlowMaster Outlaw axle back/X-Pipe, Stage 2 Ported Throttle Body, Vararam OTR CAI, Mike Norris Gen 2 catch can + GM 1LE clean side separator, 160º thermostat - Megan Racing adjustable coilovers (lowered 1.75"), Firestone Firehawk Indy 500s - Tuned by Ryan @ GPI via HP Tuners
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11-30-2020, 10:47 PM
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#14 |
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I'll tinker with it tomorrow. I'm not too savy with all the vacuum hoses so I'll look around and see. I do notice it alot louder to the left front of the engine block but when I rev it up a bit, it goes away and doesn't come back.
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MODS: VARARAM CAI, Catch Can, 1 LE front/rear sway bars, engine cover/fuse box custom painted, strut tower brace, Texas Speed LT, Hi Flo Cats, Magnum Tru-X pipe, NGK Spark Plugs, PCM Spark Plug Wire, Painted Calipers, CF Spoiler w/wicker bill. |
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