bobnjudy

The duel exhaust mode on my Z06 is cutting in while I am cruising at 1500rpm. It will intermittantly switch between modes while at a constant rpm. I changed the fuse just to be sure it was not that. Does anyone have experience dealing with this problem?

RicK T

Sounds like you might have a vacuum leak. If it loses vacuum the valves open. Start at the canisters on the mufflers and work forward. Most find the leak before the hose disappears into the tunnel but some have had to go into the tunnel.

bobnjudy

OK thanks, I will check that out.

96GS#007

When you say "switch between modes", does the car get slightly louder or are the mufflers fully opening....ie if you had a "Mild to Wild" switch it would be like running in "Wild"?

If they're just slightly opening and closing and it seems rpm dependent, then a vacuum leak as Rick suggested is certainly possible. If they are going "full open" and then back to full closed again, I would check the vacuum solenoid. The connector may be loose or it may be going bad. As I recall, the solenoid is behind the passenger tail lights mounted on the bumper bar. Should have a flexible/rubbery cover over it.