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Old 05-26-2017, 02:35 PM   #1
Marty McFlew
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NPP Rattles at Startup

NPP butterflies rattle at could startup, but stops when warm. Is it normal?
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Old 05-26-2017, 04:48 PM   #2
Billabongi

 
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Quote:
Originally Posted by Marty McFlew View Post
NPP butterflies rattle at could startup, but stops when warm. Is it normal?
Unfortunately yes and there's no real fix. There's a bunch of threads on it here. GM came out with an epoxy "fix" but the issue is coming back.
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Old 05-26-2017, 06:20 PM   #3
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Yes my '16 does it too but seems like it's not as loud now. I have almost 13,000 miles and have the exhaust set on track mode plus the fuse is pulled too.
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Old 05-26-2017, 08:44 PM   #4
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Borla ATAK will fix it!
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Old 05-27-2017, 01:24 PM   #5
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How can you tell? Mins starts up open no matter what mode it's in. I'm sure the neighbors love it. Yes I can put it in stealth mode and it's quiet at start but then I have to turn it on manually. My 14 Vette did it but they updated the software and my 16 Z was quiet at start too. But Chevy seems to take care of Vette owners better than us.
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