Gold Lifetime Member
Join Date: Sep 2006
Location: The Bluegrass State
Anyone getting exhaust popping with factory air injection?
My 69 big block car still has the factory air pump, lines, etc., and it is all functional. It also has the stock dual exhaust with the transverse muffler. As long as I have owned the car, it has exhibited a little bit of backfiring or "popping" out the exhaust on deceleration. I have always attributed this to the air injection pumping air into the exhaust stream, which is igniting unburned fuel that has gone out the exhaust during deceleration. Has anyone else seen this with the factory, functional air injection system on their car? I know a lot of people remove the vanes and block the lines off on their pumps to "dummy" them up, but I'm sure there is someone out there with a survivor car and a 4-speed who can comment on this. I suppose I could have something else causing this. The carb has been rebuilt and the car runs well otherwise. This is more of a curiosity to me than anything else - I don't really think it is a major problem.
1967 RS/SS 350 Conv - triple black, 4sp, tach & gauges
1969 VN-built RS/SS 396 Conv - Garnet Red/Black, 4-sp, tach & gauges