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So what is the best way to check to see if your vacuum advance is bad or not? This is one thing that I have never really messed with and probably why all of my CJs have run a little on the rough side instead of purring like a wild cat.
Jack
I ALWAYS TRY TO SEE THAT THE MECHANICAL PART MOVES, YOU COULD ALSO CHECK THE MECHANICAL ADVANCE WHILE YOU'RE THERE, AND MAKE SURE THE VAC PART HOLDS VACUME. ALSO IF YOU HAVE A TIMING LIGHT YOU CAN APPLY VAC AND CHECK FOE TIMING CHANGE, DISCONNECT VAC REV MOTOR TO CHECK MECH ADVANCE. AS FAR AS THE MECANICAL CHECKS AN AMC I'M A LITTLE FUZZY BUT I WAS ALWAYS PLAYING WITH BASE TIMING AND BOTH ADVANCES WHEN I HAD S.B. CHEV FOR DAILY DRIVERS, THE ONE HAD STICKING MECH ADVANCE, AND SWAPPED OUT DIST, COULDN'T BELEVE THE DIFFERENCE, SEEMED LIKE A DIFFERENT MOTOR. HOPE THIS HELPS.