Multi mode exhaust issue?
Thread Starter
Melting Slicks
Joined: Aug 2018
Posts: 2,781
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Multi mode exhaust issue?
My car is brand new with only 400 miles and when I switch modes on my exhaust I don't really notice a big difference. When I checked the valves at the end of the tail pipe the passenger valve never moves and stays open all the time yet the driver side works as it should. I'm thinking they both need to open and close right?
Maybe either the one has a bad motor or it is disconnected? Anybody familiar with this issue?
Maybe either the one has a bad motor or it is disconnected? Anybody familiar with this issue?
Safety Car
Joined: Dec 2012
Posts: 3,858
Likes: 1,863
From: St. Louis Metro East IL
They fail open on engine off / loss of power. Both should move at the same time. They should be open at engine start and then close in tour / sport. The valves then both open at around 1800 rpm. You can have someone watch from a few feet away.
Ron
Ron
Thread Starter
Melting Slicks
Joined: Aug 2018
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I brought it in to the dealer today and when they checked it out they found one of the actuators wasn't plugged in. They tried to plug it in and found one of the pins was broke and it wouldn't connect. They figured it happened during production and someone on the assembly line just let it go unplugged and figured nobody would ever notice or if they did the dealer could deal with it. Well a new actuator is on order and cost 500 bucks.
Thread Starter
Melting Slicks
Joined: Aug 2018
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Yes it is covered. I'm just glad I checked out the valves and how they worked or I may have never known there was an issue. The only reason I visually checked them out was because I really didn't notice a big difference between modes. I wonder how many C7 owners visually check to see if the valves are working properly.
Team Owner
Joined: Oct 2004
Posts: 25,583
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There's usually no reason to check because the difference in sound is quite apparent, especially when you change the NPP exhaust setting from Stealth to Track. Doing that and not noticing a difference is a clear sign that one or both actuators aren't working. They fail open.
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Thread Starter
Melting Slicks
Joined: Aug 2018
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Likes: 3,105
There's usually no reason to check because the difference in sound is quite apparent, especially when you change the NPP exhaust setting from Stealth to Track. Doing that and not noticing a difference is a clear sign that one or both actuators aren't working. They fail open.
Thread Starter
Melting Slicks
Joined: Aug 2018
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From what I have been told is a faulty valve will stay open and not be able to close. I think most of us prefer the more performance sound with both valves open so if the valves malfunction it won't be a big deal or maybe even worth fixing.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,865
From: Virginia
Just what I was thinking, remove fuse #42, problem solved, unless you prefer being able to quite your C7.
Thread Starter
Melting Slicks
Joined: Aug 2018
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I'm sure there will be times where you may want it quiet and having that option will be nice. Like on long trips when you're just cruising. Hey we paid extra for this exhaust so it might as well work as it should. Now 5 or six years down the road and it malfunctions I may save myself a few bucks and just leave it alone.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,865
From: Virginia
I'm sure there will be times where you may want it quiet and having that option will be nice. Like on long trips when you're just cruising. Hey we paid extra for this exhaust so it might as well work as it should. Now 5 or six years down the road and it malfunctions I may save myself a few bucks and just leave it alone.
Thread Starter
Melting Slicks
Joined: Aug 2018
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Good to know. I plan on taking many trips with my Vette and figured at highway speeds I might prefer quiet. I like having the option.