Hivolt5.0
Senior Member
I'm curious where you all get a vacuum advance for a 312. The one off my distributor has a straight shaft (see pic) but all of the replacement ones have a bent shaft.
The engine hasn't been running the best lately. It idles fine and drives ok but as you are cruising you can feel some hesitation/surging or perhaps a bit of a miss. I recently installed a MSD chrome coil but still have the points. I asked, before I did this if it'd be ok and the consensus was as long as I had the ballast resistor it should be ok, which I do. With the miss/hesitation I thought perhaps the coil was burning my points so I switched back to the old coil but before I took it for a spin I decided to check the points and vacuum advance. The points looked great, no burn spots, but when I put my vacuum pump on the advance I couldn't pull any vacuum. I'm assuming a faulty vacuum advance would cause the hesitation/surging/missing feeling the motor has.
What else should I check???
thanks
David
The engine hasn't been running the best lately. It idles fine and drives ok but as you are cruising you can feel some hesitation/surging or perhaps a bit of a miss. I recently installed a MSD chrome coil but still have the points. I asked, before I did this if it'd be ok and the consensus was as long as I had the ballast resistor it should be ok, which I do. With the miss/hesitation I thought perhaps the coil was burning my points so I switched back to the old coil but before I took it for a spin I decided to check the points and vacuum advance. The points looked great, no burn spots, but when I put my vacuum pump on the advance I couldn't pull any vacuum. I'm assuming a faulty vacuum advance would cause the hesitation/surging/missing feeling the motor has.
What else should I check???
thanks
David
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