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Discussion Starter #1
I checked the vacume advance on my stock distributer with a vacume pump and found that I could get a vacume and the advance arm would move, but could not hold the vacume. The arm would just pull back as soon as I stoped pumping. To me this looks like the diaphram is shot. Yes, No, Maybe?
 

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I'd tend to agree - whenever I see an inability to hold a vacuum, there's been a damaged diaphragm SOMEWHERE in the picture...

...and if I were you, I'd replace it with an undamaged diaphragm before I did anymore torque'n on the cat - damaged diaphragms are D-A-N-G-E-R-O-U-S, I'ma tellin' YOU *wink, wink, nudge, nudge* ;)

Oh...sorry...was that out loud? *blush*
 
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