02-07-2020, 04:04 PM | #1 |
Drives: 2010 Chevrolet Camaro 2SS RS Join Date: Jan 2020
Location: South Carolina
Posts: 62
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Weird tapping noise
So when I start my car up from cold, after a couple minutes while it’s idling, there is a small little 3 or 4 taps that sounds like someone is standing behind my car and tapping on my trunk. I cannot work out what it would be for the life of me so wondering if anyone can help put this one to bed
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02-07-2020, 04:42 PM | #2 |
Drives: 2010 Camaro 2SSRS M6 Join Date: Jan 2019
Location: Alabama
Posts: 1,249
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This is a mystery question. I think it has been determined it involves the evap system on our cars. If anyone else knows what it is I would like a for sure reason my self.
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02-07-2020, 10:25 PM | #3 |
Drives: 2010 Chevrolet Camaro 2SS RS Join Date: Jan 2020
Location: South Carolina
Posts: 62
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So it isn’t just my car then?
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02-07-2020, 11:48 PM | #4 |
Drives: 2010 CGM 2SS/RS LS3 Swapped A6 Join Date: Sep 2016
Location: Spring Hill, FL
Posts: 4,569
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Yea this is supposedly some part of the evap system. First time I heard it I nearly shat myself, because like you said, it sounds like someone tapping on the car. I looked and nobody was behind me or outside. It only occurs on cold starts about a minute or so after the car has started. Definite WTF moment.
As long as you don't have anyone locked in your trunk it is not an issue. No, it is not your car. I mean it is, but not JUST your car. It happens by design.
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2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) 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 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, 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"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI
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02-08-2020, 07:19 AM | #5 |
old school chevy rodder
Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012
Location: Oregon
Posts: 5,588
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Watched a SS driving down the road the other day, he had a high lift spoiler and a set of this and that, and a exhaust that would shift on the passenger side moving up and down...….. And obvious he had removed the exhaust and redone it..... And I wondered if maybe he had some annoying noise now and then..... Just a thought as its been documented on here over and over form hangers not just right etc making tapping sounds ...that and the loose shielding etc...…….
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2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop
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02-08-2020, 12:54 PM | #6 |
Drives: 2010 Camaro 2SSRS M6 Join Date: Jan 2019
Location: Alabama
Posts: 1,249
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Mine is definitely not the hangers as I can be sitting still when it does it. I’m pretty sure it is the evap system.
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02-08-2020, 01:07 PM | #7 |
Drives: 2010 CGM 2SS/RS LS3 Swapped A6 Join Date: Sep 2016
Location: Spring Hill, FL
Posts: 4,569
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Yep. Usually on stone cold starts/first start of the day. A couple minutes after start, 'TAP TAP TAP TAP TAP'. Most people describe it the same way, like someone is tapping a fingernail on the trunk lid.
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2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) 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 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, 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"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI
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02-08-2020, 01:07 PM | #8 |
Drives: 2015 2SS/RS Join Date: Apr 2012
Location: Southeast Louisiana
Posts: 2,112
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It's an evap valve near the fuel tank doing it's thing when you crank the car. All three of my 5th gens have done it. Business as usual.
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2015 Camaro 2SS/RS SIM
2016 Jeep Wrangler 2DR Willys Wheeler 1993 C1500 Single Cab Stepside 5.3L LS Swap |
02-08-2020, 02:24 PM | #9 |
Drives: 2010 Chevrolet Camaro 2SS RS Join Date: Jan 2020
Location: South Carolina
Posts: 62
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Hahah awesome, thanks for the info. Scared the crap outta me the first few times thinking I was about to get jumped. Glad to hear that it’s normal though
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