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Exhaust popping

drsantos

Active member
Joined
Jun 9, 2002
Messages
39
Location
Rehoboth, MA
Corvette
1981 Charcoal met, 4-speed
During deceleration I hear popping out of the mufflers, what can be done to eliminate this. The CAT converter has been removed otherwise the exhaust is factory. 1981 4 speed.
 
D

Dave L.

Guest
My car does the same.The only way is to install a connector pipe,x or H style between the 2 exhaust pipes.There was a discussion on this subject on another post recently.There is a natural tendency in the motor that causes this condition.In my own case I have learned to with it for now.

Dave
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
"Popping" on over-run is generally caused by excessively lean idle mixture or air being introduced into the exhaust system through a leak somewhere. Chances are the vacuum diaphragm in the diverter valve on your A.I.R. pump has failed; when they fail, the spool valve defaults to the open position, so air from the pump is dumped into the exhaust manifolds all the time, causing over-run "popping". When working normally, the diverter valve is designed to dump air out through the little "muffler" under sudden high-vacuum conditions (like over-run). When the diaphragm fails, it also causes a vacuum leak at the signal hose that feeds it from the carburetor, which causes even more lean mixture problems.
 

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