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Corvette
C7 Forum
Stealth mode turning on by itself...dealership clueless
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<blockquote data-quote="12years" data-source="post: 258040" data-attributes="member: 7429"><p>Very weird.....has anyone else experienced this?</p><p>Bought my 2019 GS M7 hardtop July 2021 with 5300km. No exhaust issues at the beginning.</p><p></p><p>Now, for the past 1-2 months, it sounds as if stealth mode activates by itself while I'm driving as per usual with the exhaust in track mode and the drive mode in sport. It happens ONLY in 3rd gear when I let off the throttle....if I give it soft/hard throttle its silent until I hit 2,700 RPM and then sounds like track mode again/valves open again. The track mode sound also comes back in 3rd gear if let the RPM drop to 1600 without touching the throttle...if i give it throttle at this point sound is in track mode again....then if I let off throttle again it sounds like stealth mode again until either falling to 1600 or revving to 2700rpm. When the silence is there it will continue if I downshift to 2nd, but not if I upshift to 4th. </p><p></p><p>Have been to the dealership (with at least one Corvette tech onsite at all times) once already for this issue and they had no idea what to do about it. They were apparently later told by GM that this is a "normal occurrence" because of eco mode/location where the car was sold, and that they have heard one case of this before in Canada and another in the US.....what??? That makes no sense. There problem wasn't there when I first got the car, only happens in 3rd gear, and I am NEVER in eco mode....</p><p></p><p>Can anyone shed any light on this? They are proposing strapping a Go-Pro camera to the exhaust in order to visualize the valves while driving. I'm dropping the car off again tomorrow.</p></blockquote><p></p>
[QUOTE="12years, post: 258040, member: 7429"] Very weird.....has anyone else experienced this? Bought my 2019 GS M7 hardtop July 2021 with 5300km. No exhaust issues at the beginning. Now, for the past 1-2 months, it sounds as if stealth mode activates by itself while I'm driving as per usual with the exhaust in track mode and the drive mode in sport. It happens ONLY in 3rd gear when I let off the throttle....if I give it soft/hard throttle its silent until I hit 2,700 RPM and then sounds like track mode again/valves open again. The track mode sound also comes back in 3rd gear if let the RPM drop to 1600 without touching the throttle...if i give it throttle at this point sound is in track mode again....then if I let off throttle again it sounds like stealth mode again until either falling to 1600 or revving to 2700rpm. When the silence is there it will continue if I downshift to 2nd, but not if I upshift to 4th. Have been to the dealership (with at least one Corvette tech onsite at all times) once already for this issue and they had no idea what to do about it. They were apparently later told by GM that this is a "normal occurrence" because of eco mode/location where the car was sold, and that they have heard one case of this before in Canada and another in the US.....what??? That makes no sense. There problem wasn't there when I first got the car, only happens in 3rd gear, and I am NEVER in eco mode.... Can anyone shed any light on this? They are proposing strapping a Go-Pro camera to the exhaust in order to visualize the valves while driving. I'm dropping the car off again tomorrow. [/QUOTE]
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Corvette
C7 Forum
Stealth mode turning on by itself...dealership clueless
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