Fuse Pull Question For NPP - Page 3

mdhopt36 · 12-24-2018, 10:57 AM

"...I did the fuse pull, and in my 2SS with NPP I was not liking the change to 4 cyl with the AFM. "

-THIS-.

I start mine up, and it has a very nasty -BLATT!_ on startup. Sitting there for around 20-30 seconds, there is a definite attenuation of the sound level as it warms up.
On road ways, the V4 mode definitely cuts the sound level. Applying light accelerator, the flaps in the exhaust open up, and return to the pleasant exhaust note.

This flap actuation can at times be heard as a definite kind of "slap-shut" thing. It seems to be linked to AFM.
I wish i could get rid of that. Sounds like a 'puntain ride " bouncing back&forth in slow urban driving.

The fuse was pulled- by help from the dealer long time ago. By a very helpful salesman dude !!!
So it's not gonna void any warranty coverage.

**********
Maybe if I just got underneath, and unplugged those dayam back pressure valves that keep it from popping under zero throttle???

18ss376 · 12-25-2018, 07:31 AM

Um, you don't need any tools or pliers to pull the fuse, see the WHITE fuse puller located to the left. Just thought it was funny in the video the guy never even noticed that...lol

zag · 12-25-2018, 10:18 AM

Back on the first page, Corvette Mike asked what NPP meant. I would also like to know what the letters NPP stand for?

Thanks

2SSRedline · 12-25-2018, 11:48 AM

Quote:

Originally Posted by zag

Back on the first page, Corvette Mike asked what NPP meant. I would also like to know what the letters NPP stand for?

Thanks

It is simply the RPO code for that option.

drperry · 12-25-2018, 01:17 PM

Quote:

Originally Posted by mdhopt36

"...I did the fuse pull, and in my 2SS with NPP I was not liking the change to 4 cyl with the AFM. "

-THIS-.

I start mine up, and it has a very nasty -BLATT!_ on startup. Sitting there for around 20-30 seconds, there is a definite attenuation of the sound level as it warms up.
On road ways, the V4 mode definitely cuts the sound level. Applying light accelerator, the flaps in the exhaust open up, and return to the pleasant exhaust note.

This flap actuation can at times be heard as a definite kind of "slap-shut" thing. It seems to be linked to AFM.
I wish i could get rid of that. Sounds like a 'puntain ride " bouncing back&forth in slow urban driving.

The fuse was pulled- by help from the dealer long time ago. By a very helpful salesman dude !!!
So it's not gonna void any warranty coverage.

**********
Maybe if I just got underneath, and unplugged those dayam back pressure valves that keep it from popping under zero throttle???

You also have AFM specific valves in the exhaust, so that might be making things wonky.

Sent from my SM-G930W8 using Tapatalk

Soleil · 12-25-2018, 02:28 PM

The fart sound comes from the AFM valve. You can delete/ disabler the AFM with a Range.

SteevK · 01-30-2019, 12:27 AM

Quote:

Originally Posted by Soleil

The fart sound comes from the AFM valve. You can delete/ disabler the AFM with a Range.

I bought a Range AFM defeat from Amazon for about $105, then found one on Woot.com (an Amazon company) for $60. I bought the Woot one, and returned the Amazon one.

I rarely use it, since watching the "V4" light up in slow-moving traffic keeps me amused. Funny thing, the Vitesse throttle control makes AFM kick in MORE - go figure...

ste1n · 01-31-2019, 01:46 PM

Has anyone tried this on a 19 refresh? I remember reading somewhere saying that pulling the fuse triggered a cell.

breakskeet · 01-31-2019, 09:11 PM

Quote:

Originally Posted by ste1n

Has anyone tried this on a 19 refresh? I remember reading somewhere saying that pulling the fuse triggered a cell.

On my 2018 ZLE, I pulled the exhaust fuse and it triggered a CEL.

drperry · 02-01-2019, 11:48 AM

My 2018 SS M6 did not trip my CEL... Mayhap the AFM valves run on the same circuit, now?

Sent from my SM-G965W using Tapatalk

njweatherman · 02-01-2019, 01:31 PM

My friend has a 2013 ZL1 Camaro with the dual NPP exhaust and he cannot pull the fuse either because it will trigger a CEL. Maybe it's a ZL1 thing.

ZED SLED · 02-01-2019, 02:19 PM

I had the fuse pulled on my '13 ZL1 and it never threw a CEL. It decel popped and backfired like crazy when cold though.

craigss50 · 02-02-2019, 01:30 PM

Quote:

Originally Posted by Soleil

The fart sound comes from the AFM valve. You can delete/ disabler the AFM with a Range.

I noticed this when I pulled the fuse and I have the Range AFM disabler. No more "fart" sound upon startup. I like it better without that sound and so will my neighbors.

12-25-2018, 02:28 PM	#34
Soleil Drives: Camaro 50th anniversary edition Join Date: May 2017 Location: Europe Posts: 2,203 View My Garage	The fart sound comes from the AFM valve. You can delete/ disabler the AFM with a Range. __________________ Soleil _____________________________________________ A car is fast enough, if you fear to unlock it in the morning." (Walter Roehrl)

02-01-2019, 02:19 PM	#40
ZED SLED Drives: 2017 Mosaic Bk ZL1 M6 Join Date: Jul 2009 Location: South of Raleigh, NC Posts: 9,480 View My Garage	I had the fuse pulled on my '13 ZL1 and it never threw a CEL. It decel popped and backfired like crazy when cold though. __________________

12-24-2018, 10:57 AM	#29
mdhopt36 Drives: '17- 1ag37 V6 traded, for 1SS 2018! Join Date: Mar 2018 Location: MA Posts: 469	"...I did the fuse pull, and in my 2SS with NPP I was not liking the change to 4 cyl with the AFM. " -THIS-. I start mine up, and it has a very nasty -BLATT!_ on startup. Sitting there for around 20-30 seconds, there is a definite attenuation of the sound level as it warms up. On road ways, the V4 mode definitely cuts the sound level. Applying light accelerator, the flaps in the exhaust open up, and return to the pleasant exhaust note. This flap actuation can at times be heard as a definite kind of "slap-shut" thing. It seems to be linked to AFM. I wish i could get rid of that. Sounds like a 'puntain ride " bouncing back&forth in slow urban driving. The fuse was pulled- by help from the dealer long time ago. By a very helpful salesman dude !!! So it's not gonna void any warranty coverage. ********** Maybe if I just got underneath, and unplugged those dayam back pressure valves that keep it from popping under zero throttle???

12-25-2018, 07:31 AM	#30
18ss376 Drives: Camaro Join Date: Sep 2018 Location: USA Posts: 520	Um, you don't need any tools or pliers to pull the fuse, see the WHITE fuse puller located to the left. Just thought it was funny in the video the guy never even noticed that...lol

12-25-2018, 10:18 AM	#31
zag Drives: 2018 camaro 2 ss Join Date: Feb 2018 Location: FL Posts: 51	Back on the first page, Corvette Mike asked what NPP meant. I would also like to know what the letters NPP stand for? Thanks

01-31-2019, 01:46 PM	#36
ste1n Drives: 2019 2SS Join Date: Mar 2018 Location: Ohio Posts: 103	Has anyone tried this on a 19 refresh? I remember reading somewhere saying that pulling the fuse triggered a cell.

02-01-2019, 11:48 AM	#38
drperry Drives: Chevy Blazer Join Date: Sep 2009 Location: Grande Prairie, AB Posts: 300	My 2018 SS M6 did not trip my CEL... Mayhap the AFM valves run on the same circuit, now? Sent from my SM-G965W using Tapatalk

02-01-2019, 01:31 PM	#39
njweatherman Drives: 2018 Camaro 2SS, redline edition Join Date: Jun 2013 Location: Hackettstown, NJ Posts: 209	My friend has a 2013 ZL1 Camaro with the dual NPP exhaust and he cannot pull the fuse either because it will trigger a CEL. Maybe it's a ZL1 thing.

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