Exhaust Whistle after cold start

cskipgo · 07-23-2019, 06:16 PM

Hello!

I have a 2019 SS with NPP exhaust. It started making a whistle (almost a metal on metal sound). It happens about 7-10 seconds after starting it in the morning? Sometimes it happens on the freeway. It seems to coincide sometimes with the change from V8 to V4. But consistently happens after a cold start. I am thinking it is the exhaust valves closing?

Anyone else have this issue?

jimharrell · 07-24-2019, 07:44 AM

What mode is it in? Track?

cskipgo · 07-24-2019, 09:38 AM

Quote:

Originally Posted by jimharrell

What mode is it in? Track?

I usually keep it in Sport, but I tried starting it in Tour and same thing. Maybe I should try starting it in Track, does the mode effect the initial start up?

cskipgo · 07-24-2019, 11:01 AM

Also, dealer kept it for a week. Said they needed to consult with a regional service technician manager? They gave me a loaner for the week, said GM does not have a fix at this time. I just got it back. Oddly, my paperwork states "Customer reports exhaust noise, no abnormal noise heard"?

They state they will contact me if GM offers a fix at some point. Is this normal? Should I be concerned that my paperwork does not state that they heard the noise?

Calcanuck · 07-24-2019, 11:10 PM

Quote:

Originally Posted by cskipgo

Also, dealer kept it for a week. Said they needed to consult with a regional service technician manager? They gave me a loaner for the week, said GM does not have a fix at this time. I just got it back. Oddly, my paperwork states "Customer reports exhaust noise, no abnormal noise heard"?

They state they will contact me if GM offers a fix at some point. Is this normal? Should I be concerned that my paperwork does not state that they heard the noise?

My 2017 has a similar noise and has since new, it does not last long so I have never taken it in to get it checked out.

jimharrell · 07-25-2019, 07:25 AM

I have the same kind of car, never noticed anything. The mode does affect startup...I believe though that Tour, Sport, and Track are all the same for the startup, that Stealth is the only one that keeps the valves closed on startup but I could be wrong.

Wyzz Kydd · 07-25-2019, 08:07 AM

Quote:

Originally Posted by cskipgo

I usually keep it in Sport, but I tried starting it in Tour and same thing. Maybe I should try starting it in Track, does the mode effect the initial start up?

I don't believe you will be able to start it in Track mode. If you turn it off while in Track mode it will default to Touring when you next crank it up. You can leave it in either Touring, or Sport and it will stay there when you next start it.

jimharrell · 07-25-2019, 08:58 AM

If you're talking the driving mode, yes, but if you go into the menus and select Track for exhaust, it always stays in Track for the exhaust!

Wyzz Kydd · 07-25-2019, 11:28 AM

Quote:

Originally Posted by jimharrell

If you're talking the driving mode, yes, but if you go into the menus and select Track for exhaust, it always stays in Track for the exhaust!

That's true. I should have remembered that since my exhaust is locked into Track.

Biscuit.fr · 07-26-2019, 02:43 AM

If you are looking for NPP sound issues
Look at that:

https://static.nhtsa.gov/odi/tsbs/20...82403-5448.pdf

May be not related, but just in case...

07-23-2019, 06:16 PM	#1
cskipgo Drives: 2019 2SS A10 Shadow Gray Join Date: May 2014 Location: SoCal Posts: 210	Exhaust Whistle after cold start Hello! I have a 2019 SS with NPP exhaust. It started making a whistle (almost a metal on metal sound). It happens about 7-10 seconds after starting it in the morning? Sometimes it happens on the freeway. It seems to coincide sometimes with the change from V8 to V4. But consistently happens after a cold start. I am thinking it is the exhaust valves closing? Anyone else have this issue?

07-24-2019, 07:44 AM	#2
jimharrell Drives: 2023 Camaro 2SS 1LE Join Date: Apr 2019 Location: FL Posts: 215	What mode is it in? Track? __________________ 2023/2SS/1LE/Riverside Blue Metallic/M6/PDR/NAV/Red Seat Belts/Sport Alloy Pedals/Wicker Bill Spoiler/Black Sueded Knee Pads/Black Wheel Lug Nuts and Locks/Black Camaro Fender Badge Emblem 1100 - 3/14/23 2000 - 3/14/23 3000 - 3/15/23 TPW 4/10/23 3400 - 4/03/23 TPW 4/10/23 3800 - 4/07/23 4200? - 4/12/23

07-25-2019, 07:25 AM	#6
jimharrell Drives: 2023 Camaro 2SS 1LE Join Date: Apr 2019 Location: FL Posts: 215	I have the same kind of car, never noticed anything. The mode does affect startup...I believe though that Tour, Sport, and Track are all the same for the startup, that Stealth is the only one that keeps the valves closed on startup but I could be wrong. __________________ 2023/2SS/1LE/Riverside Blue Metallic/M6/PDR/NAV/Red Seat Belts/Sport Alloy Pedals/Wicker Bill Spoiler/Black Sueded Knee Pads/Black Wheel Lug Nuts and Locks/Black Camaro Fender Badge Emblem 1100 - 3/14/23 2000 - 3/14/23 3000 - 3/15/23 TPW 4/10/23 3400 - 4/03/23 TPW 4/10/23 3800 - 4/07/23 4200? - 4/12/23

07-25-2019, 08:58 AM	#8
jimharrell Drives: 2023 Camaro 2SS 1LE Join Date: Apr 2019 Location: FL Posts: 215	If you're talking the driving mode, yes, but if you go into the menus and select Track for exhaust, it always stays in Track for the exhaust! __________________ 2023/2SS/1LE/Riverside Blue Metallic/M6/PDR/NAV/Red Seat Belts/Sport Alloy Pedals/Wicker Bill Spoiler/Black Sueded Knee Pads/Black Wheel Lug Nuts and Locks/Black Camaro Fender Badge Emblem 1100 - 3/14/23 2000 - 3/14/23 3000 - 3/15/23 TPW 4/10/23 3400 - 4/03/23 TPW 4/10/23 3800 - 4/07/23 4200? - 4/12/23

07-24-2019, 11:01 AM	#4
cskipgo Drives: 2019 2SS A10 Shadow Gray Join Date: May 2014 Location: SoCal Posts: 210	Also, dealer kept it for a week. Said they needed to consult with a regional service technician manager? They gave me a loaner for the week, said GM does not have a fix at this time. I just got it back. Oddly, my paperwork states "Customer reports exhaust noise, no abnormal noise heard"? They state they will contact me if GM offers a fix at some point. Is this normal? Should I be concerned that my paperwork does not state that they heard the noise?

07-26-2019, 02:43 AM	#10
Biscuit.fr Drives: Red hot ZL1 A10 2017 Join Date: Nov 2016 Location: MS Back to France (29) Posts: 804	If you are looking for NPP sound issues Look at that: https://static.nhtsa.gov/odi/tsbs/20...82403-5448.pdf May be not related, but just in case...

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