Just a couple days ago, my LeBaron (318-4) started to have detonations in the muffler when I got off the gas. That was really annoying and loud... Checking the muffler for leaks, but only some very minor hole (approx 1/10"). Then, thought over the whole thing and removed the belt of the smog pump.
Tada - detonation gone.
Obviously, the vac-switch turning off secondary air at high vac (when getting off the gas) is gone. I'll see if I can get a replacement.
