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08-21-2019, 12:08 AM
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#1 |
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50th Anniversary Vert
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2017 SS knocking sound
This is driving me crazy.
2017 SS Auto with NPP. When decelerating/coasting from 40 to 30, I hear a repeated knocking sound coming from under and behind the car. Knock goes away below 30 mph. Any ideas what it could be?
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08-21-2019, 05:11 PM
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#2 |
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376 cubic inches of fun
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Are you sure you're not hearing the exhaust popping we all know and love when coasting down with foot off the gas?
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08-21-2019, 05:13 PM
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#3 | |
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50th Anniversary Vert
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Quote:
I have had a Solo exhaust on my 2010, and a Borla S Type on my 2016, its not that sweet sweet popping sound. Also it doesn't knock at any other speeds.
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08-21-2019, 08:38 PM
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#4 |
 Drives: 2017 Silver SS Join Date: Dec 2017
Location: Valley springs CA
Posts: 104
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My Npp used to rattle while cruising, sounded like a constant tapping under the rear of the car. The new fix worked for me
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08-21-2019, 11:15 PM
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#5 |
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Howdy! Pete here...
Drives: 2017 50th Anniv 2SS, A8, NPP, MRC Join Date: Jul 2009
Location: Schertz, TX
Posts: 1,379
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Trunk monkey...
(somebody had to...)
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PnCRedJwl2SS
2017 50th Anniversary Edition, A8, NPP, MRC, w/Sunroof and Glow-tie! ___________________________________________  ___________________________________________ Ordered from GM Delivered to dealership and home 9-16-16 This car is a beast! |
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