advice new car with npp exhaust -issue already?

hfur · 11-23-2020, 06:21 PM

have a brand new 2021 camaro with the npp exhaust. The car is literally less than a week old.Only 65 miles on it. The car runs great, i just leave the engine sound management in auto mode all the time. it is a v6 auto. Its just that the first "cold" start of the day there seems to be a small "sound" or bang" coming from underneath the car. Then that's it. Car runs great, sounds great, etc...i stop and start the car doing my chores 3-4 times the rest of the day. No problems. Then the next day i wake up and the very first start of the morning there is that loud little "bang "sound. Is that because the car is new, or am I being paranoid, is it the valves on the exhaust? is it the catalatyic converter just waking up, or what? Anyone know what that sound is? or is it just me. thanks. let me know if anyone has any answers....

dpevans · 11-23-2020, 06:27 PM

I have a 2016 and it does the same thing. I think its computer timing and fuel management for cold starts.

LT4Greg · 11-23-2020, 06:28 PM

hfur, I really don’t think anything is wrong with your new Camaro! My ZL1 sounds off in the morning when it’s cold or sometimes even in the afternoon starting up when leaving work. Keep a check on it is my advice but from your description of the sound I don’t think you have any problem especially since it has so few a miles on it now. Just drive and enjoy the sound of your Camaro.

Jaxcam02 · 11-23-2020, 07:02 PM

Just the cold start procedure and Valves are open at startup no matter what mode you are in.

Ox45 · 11-23-2020, 07:03 PM

Quote:

Originally Posted by LT4Greg

... My ZL1 sounds off in the morning ...

That made me LOL. Like an exhaust Reveille! Love it.

Ox.

LT4Greg · 11-23-2020, 07:20 PM

You got it Ox!!

Pupilbone · 11-23-2020, 07:43 PM

I haven’t noticed the bang some of you guys are getting, but I love the way my Camaro growls on a cold start. It’s almost a let down for my son and I when we start the Camaro again after she’s warmed up.

nancygrl · 11-23-2020, 08:21 PM

you're being paranoid

LT4Greg · 11-23-2020, 09:41 PM

My ZL1 will pop loudly after restarting when warmed up. I scared a person walking behind it last year in a grocery store parking lot. I swear he must’ve jumped 3 feet in the air and yelled. He was cool about it and told me I had a real nice car. Obviously he wasn’t a car nut like all of us and I told him sorry about that big V8 scaring him!

TP2SS · 11-23-2020, 10:33 PM

Totally normal. That’s the “bark” of NPP.
If you want to get rid of it (mostly), before you shut down for the last time before you go to bed, go into the driving mode settings in MyLink, select sound management, then select “stealth”. The bark will be more of a bite on the next cold startup and you’ll be happy.
My neighbors probably hate me because I rarely do that and I like the bark!

arpad_m · 11-23-2020, 10:56 PM

Quote:

Originally Posted by hfur

have a brand new 2021 camaro with the npp exhaust. The car is literally less than a week old.Only 65 miles on it. The car runs great, i just leave the engine sound management in auto mode all the time. it is a v6 auto. Its just that the first "cold" start of the day there seems to be a small "sound" or bang" coming from underneath the car. Then that's it. Car runs great, sounds great, etc...i stop and start the car doing my chores 3-4 times the rest of the day. No problems. Then the next day i wake up and the very first start of the morning there is that loud little "bang "sound. Is that because the car is new, or am I being paranoid, is it the valves on the exhaust? is it the catalatyic converter just waking up, or what? Anyone know what that sound is? or is it just me. thanks. let me know if anyone has any answers....

Normal. It's the catalytic converter fast warmup protocol on cold starts. Check out how it does not happen on warm starts, the bark is much softer or even non-existent.

As others already said above, Do Not Panic

CamaroBody · 11-23-2020, 11:12 PM

i want more of the issue he is having

.

HCI2000SS · 11-23-2020, 11:30 PM

I have a V6 auto as well, and it does not make any type of bang noise upon start up. Like others are saying there is the cold start procedure on these newer cars, but beyond that there should be no bang type of noise. Also you mentioned starting the car 3-4 times a day in between chores. Explain why you do that if you don't mind

Zr8000 · 11-24-2020, 01:22 AM

Have the dealer look at it. You have warranty

11-23-2020, 06:21 PM	#1
hfur Account Suspended Drives: 2017 Chevy camaro Join Date: Jan 2020 Location: Northeast Posts: 89	advice new car with npp exhaust -issue already? have a brand new 2021 camaro with the npp exhaust. The car is literally less than a week old.Only 65 miles on it. The car runs great, i just leave the engine sound management in auto mode all the time. it is a v6 auto. Its just that the first "cold" start of the day there seems to be a small "sound" or bang" coming from underneath the car. Then that's it. Car runs great, sounds great, etc...i stop and start the car doing my chores 3-4 times the rest of the day. No problems. Then the next day i wake up and the very first start of the morning there is that loud little "bang "sound. Is that because the car is new, or am I being paranoid, is it the valves on the exhaust? is it the catalatyic converter just waking up, or what? Anyone know what that sound is? or is it just me. thanks. let me know if anyone has any answers....

11-23-2020, 06:28 PM	#3
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,811	hfur, I really don’t think anything is wrong with your new Camaro! My ZL1 sounds off in the morning when it’s cold or sometimes even in the afternoon starting up when leaving work. Keep a check on it is my advice but from your description of the sound I don’t think you have any problem especially since it has so few a miles on it now. Just drive and enjoy the sound of your Camaro. __________________ 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.

11-23-2020, 07:02 PM	#4
Jaxcam02 Drives: 2017 Silverado/2017 ZL1 Join Date: Aug 2019 Location: Jax/Palatka FL Posts: 1,090	Just the cold start procedure and Valves are open at startup no matter what mode you are in. __________________

11-23-2020, 07:20 PM	#6
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,811	You got it Ox!! __________________ 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.

11-23-2020, 07:43 PM	#7
Pupilbone Drives: 2019 Crush ZL1 M6 Join Date: Jul 2018 Location: Grimsby, Ontario Posts: 708 View My Garage	I haven’t noticed the bang some of you guys are getting, but I love the way my Camaro growls on a cold start. It’s almost a let down for my son and I when we start the Camaro again after she’s warmed up. __________________ #SaveTheManuals

11-23-2020, 06:27 PM	#2
dpevans Drives: 2024 Riverside Blue 2SS 1LE Join Date: Mar 2016 Location: Fort Wayne, IN Posts: 1,206	I have a 2016 and it does the same thing. I think its computer timing and fuel management for cold starts.

11-23-2020, 08:21 PM	#8
nancygrl 雪の玉 Drives: '22 Z71 RST Silverado Join Date: Feb 2011 Location: South Posts: 3,415	you're being paranoid

11-23-2020, 09:41 PM	#9
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,811	My ZL1 will pop loudly after restarting when warmed up. I scared a person walking behind it last year in a grocery store parking lot. I swear he must’ve jumped 3 feet in the air and yelled. He was cool about it and told me I had a real nice car. Obviously he wasn’t a car nut like all of us and I told him sorry about that big V8 scaring him! __________________ 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.

11-23-2020, 10:33 PM	#10
TP2SS Drives: 2016 2SS Convertible Join Date: Dec 2019 Location: SE Michigan Posts: 576	Totally normal. That’s the “bark” of NPP. If you want to get rid of it (mostly), before you shut down for the last time before you go to bed, go into the driving mode settings in MyLink, select sound management, then select “stealth”. The bark will be more of a bite on the next cold startup and you’ll be happy. My neighbors probably hate me because I rarely do that and I like the bark! __________________ 2016 2SS Convertible Hyper Blue/Ash Gray A8 Magnetic Ride Control Dual Mode Exhaust 2019+ version Split Spoke Silver Wheels Navigation Silver Rally Stripes

11-23-2020, 11:12 PM	#12
CamaroBody Drives: Hyper Blue 2SS Join Date: Jun 2013 Location: CA Posts: 1,160	i want more of the issue he is having . __________________ 2SS, Hyper Blue, 8-Speed Automatic, NPP Exhaust, Magnetic Ride Control, Sunroof, Navigation, 5-Spoke Low-Gloss Black Wheels, Black Bowtie Emblems, Cargo Mat/Net Mods: XPEL - Hood, Bumper, Headlights, & Side Mirrors JWM - Side Markers ZL1 Addons - Deluxe Rock Guards & Red Lift Pads GM - Dark Tail Lamps MRR - Gloss Black M017s

11-23-2020, 11:30 PM	#13
HCI2000SS Drives: 2018 Camaro V6/RS Join Date: Nov 2018 Location: MI Posts: 1,596	I have a V6 auto as well, and it does not make any type of bang noise upon start up. Like others are saying there is the cold start procedure on these newer cars, but beyond that there should be no bang type of noise. Also you mentioned starting the car 3-4 times a day in between chores. Explain why you do that if you don't mind

11-24-2020, 01:22 AM	#14
Zr8000 Drives: Chevy Camaro Join Date: Apr 2020 Location: Wi Posts: 384	Have the dealer look at it. You have warranty

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