Detonation ???

[eurodad]

@tom vito

Well I removed and cap the vacuum hose from the vacuum advance. the noise seems to be gone. the engine seems a little sluggish, but the noise is gone. So I guess I would need to find out what canister is in there, and maybe back up the initial timing also. sound right?

now you know it’s in the advance, so just bump it back a degree or two till it goes away.