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Old 07-21-2002, 01:49 PM
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Post Vacuum Advance

I was told by the guy I bought my car ('66 Nova SS) from that the vacuum advance within the distributor wasn't working properly, and accounted for the rough idle the engine displays.

What I want to know is, is there any way I can check for this, or do I just have to take the guy for his word, and go buy a new distributor?

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Old 07-21-2002, 02:13 PM
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Suck on the hose that goes to the diafram.See if it moves.Then pinch the hose to see if the diafram holds.
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Old 07-22-2002, 01:23 AM
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You will need to remove the distributor cap and maybe the rotor to see if the vacuum cannister is operative when a vacuum source is applied. You also need to check for advance plate movement as this might also be frozen.

You don't have to buy an exchange distributor assembly as service parts are readily available.
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Old 08-10-2002, 05:36 PM
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Heres' a rather belated re-reply. But if the vaccuum does move the advance, and pinching it holds the advance, is the vaccuum can a-ok?
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Old 08-10-2002, 07:45 PM
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a vacuum advance can easily be tested with a simple hand pump. The vacuum advance should begin moving the breaker at 7-10in/hg. You should then continue a constant 10in/hg for several seconds to make sure it doesn't leak. A vacuum advance is easily fine tuned to meet your requirements.
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Old 08-10-2002, 07:57 PM
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This hand-held pump you're talking about is one that measures the vacuum as I apply it, I take it?

I also take it (forgive me, please, for my obvious lack of knowledge) that the "breaker" you speak of is a "weight" within the distributor, that can be seen (most likely near the centrifugal advance), that advances with vacuum?

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Old 08-10-2002, 08:52 PM
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sure..the diaphragm is connected with a linkage arm that is visible in the distributor
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Old 08-11-2002, 04:44 PM
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I tested out the vacuum advance by sucking on the hose, and there seemed to be no suction at all...all I got was purple in the face!

Needless to say, nothing seemed to move in the advance assembly underneath the distributor cap (I lifted the cap up a couple of inches, and looked to see if any of the linkages moved, which they didn't)
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Old 08-11-2002, 04:46 PM
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And from what I've heard, Accel dosn't make aftermarket replacement vacuum "cans" for its HEI distributors.

Do I have to go out and buy a whole new distributor now??
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