07-05-2016, 04:49 AM | #15 |
GM repeat offender...
Drives: 16 2SS Join Date: Dec 2014
Location: Grandview, Texas
Posts: 1,474
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I dont ever hear it as much as I FEEL it in my car. I am super smooth on the throttle while cruising, and the constant 4-> 8 transition drives me crazy.
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'16 2SS, Summit White. A8. MRC. NPP.
Ordered:09/03/15. Received 12/22/15 INCOMING: ‘22 ZL1, Satin Steel. A10. PDR. Ordered: 03/02/22. |
07-05-2016, 04:28 PM | #16 |
Drives: 2016 camaro ss Join Date: Oct 2010
Location: Spring, TX
Posts: 1,127
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I couldn't hear anything in the video however my first exhaust had a chirp/squeak during the v8/v4 transition that came from the afm valves. They replaced the whole exhaust due to the NPP rattle. The new exhaust never chirped
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2016 camaro 2SS hyper blue/Kalahari, A8, MRC, NPP, sunroof, SW headers through axleback, Circle D 3600rpm TC, Pray ported IM/TB, E85
Sold: 2002 Z28, NBM, M6, 460rwhp, 2009 HHR SS RIP : 2002 WS6 Black, A4, 355rwhp |
07-08-2016, 09:15 PM | #17 | |
Drives: 2017 Camaro 1SS Join Date: Jun 2014
Location: Lansing
Posts: 114
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I've compiled a video that catches all of the chirps/screeches/grinding much better. I think it's much more clear. Currently the car's at the dealership but I haven't heard anything back yet.
Getting up to speed and coasting, no shift = screech Manually downshifting from 4th to 3rd to 2nd to 1st = screech/grind In manual mode, no shift, and applying throttle from a lower speed = grinding
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Hyper Blue | A8 | NPP Dual Mode Exhaust
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07-08-2016, 11:28 PM | #18 | ||
Drives: 2022 CT4-V Blackwing Join Date: Sep 2013
Location: Florida
Posts: 2,723
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Quote:
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2002 Corvette Z06 - Black - Sold
2013 Camaro SS 1LE - Black - M6 - Sold 2016 Camaro SS - Mosaic Black - A8 - Sold 2017 C7 Stingray - M7 Coupe - Sold 2019 C7 Grand Sport M7 Vert - Sold 2021 Camaro ZL1 - Black - A10 - Sold 2019 Tesla Model 3 2022 CT4-V Blackwing - M6 |
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07-09-2016, 01:22 AM | #19 | |
Drives: 2016 camaro ss Join Date: Oct 2010
Location: Spring, TX
Posts: 1,127
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Quote:
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2016 camaro 2SS hyper blue/Kalahari, A8, MRC, NPP, sunroof, SW headers through axleback, Circle D 3600rpm TC, Pray ported IM/TB, E85
Sold: 2002 Z28, NBM, M6, 460rwhp, 2009 HHR SS RIP : 2002 WS6 Black, A4, 355rwhp |
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07-09-2016, 04:15 PM | #20 |
Drives: 2017 Camaro 1SS Join Date: Jun 2014
Location: Lansing
Posts: 114
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Yeah in my original video I had the v4/v8 screen on. It seems to happen when it switches. This would be the first two screeches in the newest video, where it seems no shifting occurs. Manual mode shifting I did twice, so that wouldn't be the AFM for sure. I just really hope they don't tell me it's normal..
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Hyper Blue | A8 | NPP Dual Mode Exhaust
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07-09-2016, 11:00 PM | #21 | |
Drives: 2022 CT4-V Blackwing Join Date: Sep 2013
Location: Florida
Posts: 2,723
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Quote:
If it is the valves making the noise you can test it. There is a separate fuse that controls the AFM valves. You can pull it and drive. The car will still switch to AFM mode but the valves obviously won't close. However, be aware that when you are in v4 mode with the AFM valves closed the exhaust will sound bad, which is why we need them. Furthermore, unlike the fuse for the rear NPP valves, pulling the AFM NPP fuse will cause a CEL. Has the dealer performed the TSB that calls for them to spray dry slide lubricant into the valve assemblies?
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2002 Corvette Z06 - Black - Sold
2013 Camaro SS 1LE - Black - M6 - Sold 2016 Camaro SS - Mosaic Black - A8 - Sold 2017 C7 Stingray - M7 Coupe - Sold 2019 C7 Grand Sport M7 Vert - Sold 2021 Camaro ZL1 - Black - A10 - Sold 2019 Tesla Model 3 2022 CT4-V Blackwing - M6 |
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07-11-2016, 04:00 AM | #22 | ||
GM repeat offender...
Drives: 16 2SS Join Date: Dec 2014
Location: Grandview, Texas
Posts: 1,474
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Quote:
__________________
'16 2SS, Summit White. A8. MRC. NPP.
Ordered:09/03/15. Received 12/22/15 INCOMING: ‘22 ZL1, Satin Steel. A10. PDR. Ordered: 03/02/22. |
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07-22-2016, 04:49 PM | #23 |
Drives: 2017 Camaro 1SS Join Date: Jun 2014
Location: Lansing
Posts: 114
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Just an update. The dealer said all of my transmission problems and noises, AFM/exhaust squeaks and screeches, are normal. They drove other 16 Camaros that had the same problems, which are "by design"...
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Hyper Blue | A8 | NPP Dual Mode Exhaust
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10-31-2017, 10:29 AM | #24 |
When mine goes from V4 to V8 especially slow speeds on slight inclines I hear this annoying almost backfire “poof” sound - anyone else?? Or is that normal (dealership thinks so of course)
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11-01-2017, 09:29 PM | #25 |
Drives: '16 2SS GD1 MX0 NPP F55 IO6 Join Date: Jun 2013
Location: Florida
Posts: 1,298
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Automatic transmission? That sound is the forward AFM exhaust valves (under your front seats) popping open. If it were a cylinder activation issue, you would hear the noise through the top of the dash because the rear cylinders are the ones that turn on and off (against the firewall). The open of this thread, his first video sounded very much like those valves activating. In his second video he didn't show a good DIC screen to contribute to what could be happening and it sounded like a squeak with headphones on, so it could've been a steering rack noise because it happened coming out of a turn both times.
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11-02-2017, 07:34 AM | #26 |
Drives: Wild Cherry LT1 Join Date: Dec 2016
Location: Massachusetts
Posts: 1,925
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My car has the same scraping sound transitioning from V8 to V4. In mine, it’s definitley the afm valves causing the noise.
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08-19-2019, 05:32 PM | #27 |
Drives: 2019 2SS A10 Shadow Gray Join Date: May 2014
Location: SoCal
Posts: 210
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Any updates? Did everyone get theirs fixed, or silenced at least?
Having the same issue with my 2019. |
10-09-2019, 01:50 PM | #28 |
Drives: 1968 Camaro Join Date: Feb 2016
Location: Riverside, CA
Posts: 16
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Im curious what can be done also. Mine sounds like a bad exhaust leak whenever its in V4 mode
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