Lee Willis
Posts: 1952
Joined: 7/27/2005
Status: offline
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What you were told is true, during normal driving the butterfly valves are closed and they open only under certain conditions of higher RPM and full throttle, etc. They are closed at idle and when the car is at rest, etc.
Check whether: a) what you are looking at is in fact the butterfly valve, and b) that it is closed when the car is stationary but the engine is idling. I have what is basically the same type of system on my Porsche and the valves stay open when the engine is off, but shut as soon as it is started and at idle. May be the 'vette is similar, I've never bothered to look.
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2007 Aston Martin Vantage Prodrive
Lincoln MKZ "Grandfather car"
''98 Z28 with iron LS 408, NOS, tricks, street driven mid 9s (sold to my youngest son for $1, Aug 28, ''07)
''02 SCd 427 cid ZO6, 704 RWHP, sold Aug. 28, ''07
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Printable Version
Z06 Exhaust Butterfly settings... - 
